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Gotowa bibliografia na temat „Lubricating flow”

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Data publikacji: 25 maja 2024

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Artykuły w czasopismach na temat "Lubricating flow"

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Wu, Bo, Xiao Dong Yu, Xue Mei Chang i Chao Yin. "Influence of Working Parameters on Dynamic Pressure Effect of Heavy Constant Flow Hydrostatic Center Rest". Applied Mechanics and Materials 274 (styczeń 2013): 82–86. http://dx.doi.org/10.4028/www.scientific.net/amm.274.82.

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In order to increase the working performance of a heavy constant flow hydrostatic center rest, a theoretical study concerning the lubricating oil film dynamic pressure effect of the heavy constant flow hydrostatic center rest is described. The Computational Fluid Dynamics and the Finite Volume Method have been used to compute numerically the static pressure field and the total pressure field of the lubricating oil film. The influences of spindle rotating rate, lubricating oil dynamic viscosity and inlet flow rate on the lubricating oil film dynamic pressure effect of the heavy constant flow hydrostatic center rest were analyzed based on the computational fluid dynamics and lubrication theory, and the influencing laws were revealed. By means of this method, the reasonable data can be provided for reasonably controlling dynamic pressure and structure optimal design of the heavy constant flow hydrostatic center rest.
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Wang, Xigui, Jian Zhang, Yongmei Wang i Chen Li. "Self-Anti-Disturbance Control of a Hydraulic System Subjected to Variable Static Loads". Applied Sciences 12, nr 14 (19.07.2022): 7264. http://dx.doi.org/10.3390/app12147264.

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A hydraulic system’s lubricating oil is subject to serialized variable static loads with performance. An improved self-turbulent flow algorithm, based on the real-time acquisition and monitoring of lubricating oil static pressure in a hydraulic system to simulate variable static loads, is proposed. A mathematical model of the electrohydraulic servo control system for lubricating oil static pressure acquisition is presented, and the self-turbulent flow controller is designed for numerical analysis. The self-anti-disturbance control strategy for the lubricating oil static pressure of an electrohydraulic servo system is discussed, which is used for quadratic optimization, pole placement, PID, and self-turbulent flow control, and the lubricating oil static pressure simulation model of self-turbulent flow control is constructed by a SIMULINK module. The numerical simulation results indicate that the overshoot is significantly reduced. The proposed self-anti-disturbance control algorithm is verified by experiments, and the lubricating oil static pressure acquisition followability and monitoring accuracy are greatly improved. Variable hydraulic lubricating oil static pressure acquisition and monitoring can be effectively and stably adjusted by a predesigned electrohydraulic servo control system in the field of power hydraulic fluid lubrication.
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Sun, Jun, Xiao Zhang, Jianxiong Zhu, Yaming Gao, Hu Wang, Xiaoyong Zhao, Qin Teng, Yanping Ren i Guixiang Zhu. "On the lubrication characteristics of piston ring under different engine operation conditions". Industrial Lubrication and Tribology 72, nr 1 (9.09.2019): 101–8. http://dx.doi.org/10.1108/ilt-06-2019-0220.

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Purpose Currently, lubrication analysis of piston ring is generally done under engine rated operating condition. However, the engine (such as the vehicle engine) does not always operate in rated operating condition, and its operating condition changes frequently in actual use. In addition, the lubrication status of piston ring is generally assumed as the flooded lubrication or a certain form of poor lubrication in most of the lubrication analysis. Design/methodology/approach In this paper, based on the equations about the flow rate of lubricating oil and the variation of control volume, the flow model of lubricating oil in the piston ring-cylinder liner conjunction is established. The lubrication analysis of piston ring for a four-stroke engine under different engine operating conditions is done, in which the lubricating oil at the inlet of piston ring is considered as the lubricating oil attached on the relevant location of cylinder wall after the piston ring moves over at the previous stroke. Findings There is remarkable difference for the lubrication characteristics of the piston ring under different engine operating conditions. The worst lubrication status of piston ring may not take place under engine rated operating condition. Originality/value In this paper, based on the measured engine cylinder pressure, the lubrication analysis of piston ring for a four-stroke engine under different engine operating conditions is done in which the lubricating oil supply condition at the inlet of piston ring is considered. The results of this paper are helpful for the design and research of engine piston ring-cylinder liner conjunction.
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Liu, Guomin, Xueqiao Wu, Meng Zou, Yuying Yan i Jianqiao Li. "Experimental Study on Drag Reduction Characteristics of Bionic Earthworm Self-Lubrication Surface". Applied Bionics and Biomechanics 2019 (23.10.2019): 1–8. http://dx.doi.org/10.1155/2019/4984756.

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In the present study, a coupling bionic method is used to study the drag reduction characteristics of corrugated surface with lubrication. In order to test the drag reduction features, bionic specimen was prepared inspired by earthworm surface and lubrication. Based on the reverse engineering method, nonsmooth curve of earthworm surface was extracted and the bionic corrugated sample was designed, and the position of lubrication hole was established by experimental testing. The lubricating drag reduction performance, the influence of normal pressure, the forward velocity, and the flow rate of lubricating fluid on the forward resistance of the bionic specimens were analyzed through a single factor test by using the self-developed test equipment. The model between the forward resistance and the three factors was established through the ternary quadratic regression test. The results show that the drag reduction effect is obvious, the drag reduction rate is 22.65% to 34.89%, and the forward resistance decreases with the increase of the forward velocity, increases with the increase of the normal pressure, and decreases first and then becomes stable with the increase of flow rate of lubricating fluid. There are secondary effects on forward resistance by the three factors, and the influencing order is as follows: normal pressure>flow rate of lubricating fluid>forward velocity.
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Yu, Xiao Dong, Xiu Li Meng, Hui Jiang, Xiao Zhong Lou, Bo Wu, Hong Jun Xiang, Xian Zhu Sun, Chang Qing Yang i Jun Feng Wang. "Numerical Simulation on Oil-Flow-State of Gap Oil Film in Sector Cavity Multi-Pad Hydrostatic Thrust Bearing". Applied Mechanics and Materials 37-38 (listopad 2010): 743–47. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.743.

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Hydrostatic thrust bearing lubrication is significantly affected by the oil flow state of gap oil film, but it can not be measured by experiment and analysis. For this problem, the oil flow state of gap oil film in sector cavity multi-pad hydrostatic thrust bearing during rotation was simulated by using computational fluid dynamics, lubricating theory, and Finite Element Method. Laminar model and κ-ε turbulence model were adopted to model incompressible steady equations, and the equations were discreted by using Finite Volume Method and Second-order Finite Difference. By comparing the calculated results of numerical simulation and semi-empirical theoretical equation, the numerical simulation is proved feasible in oil film state analysis parameter prediction, which can overcome the deficiency of single model and get good effect. Streamlines and velocity vectors show that the lubricating oil flow in the resistive oil edges and oil cavities are laminar flow under the conditions of speed and flow in less than a certain value, while the flow and speed are more than a certain value, the lubricating oil flow in the resistive oil edges is also laminar flow, but the lubricating oil flow in the oil cavities is turbulent flow, then determines critical flow and critical speed. The critical flow and critical speed were determined, it provides a theoretical basis of the temperature field and thermal field deformation calculation.
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Sun, Jun, Feifei Hao, Guangsheng Liu, Hu Wang, Qin Teng, Enming Miao, Xiaoyong Zhao, Yanping Ren i Guixiang Zhu. "Research on the lubrication performance of engine piston skirt–cylinder liner frictional pair considering lubricating oil transport". International Journal of Engine Research 21, nr 4 (4.06.2018): 713–22. http://dx.doi.org/10.1177/1468087418778658.

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In current lubrication analysis of piston skirt, the flooded status is generally considered in the piston skirt–cylinder liner frictional pair in all strokes of an engine operating cycle. However, the quantity of lubricating oil at the entrance of piston skirt cannot always ensure the sufficient lubrication status of piston skirt–cylinder liner frictional pair when the piston moves from the bottom dead center to the top dead center in actual engine. In this article, based on the model of piston secondary motion, fluid lubrication, and lubricating oil flow, the lubrication performance of piston skirt–cylinder liner frictional pair is analyzed, in which the quantity of lubricating oil detained on the surface of cylinder liner after the piston skirt moves from the top dead center to the bottom dead center and is considered as the quantity of lubricating oil at entrance of piston skirt when the piston moves from the bottom dead center to the top dead center. The results show that compared with current analysis, in which the sufficient lubrication of piston skirt–cylinder liner frictional pair is assumed in all strokes of engine, there are remarkable changes for the lubrication performance of piston skirt–cylinder liner frictional pair and the piston secondary motion when the lubrication status of the frictional pair in the upstroke of piston is determined by considering actual lubricating oil transport in the lubrication analysis of piston skirt.
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Ding, Yuan Fa, Wen Guo Huo, Xiang Dong Su i Lan Zhang. "A Grinding Wheel of Self-Lubrication with Solid Powder Lubricant and Centrifugal Impeller for Green Grinding Process of TC4 Alloy". Key Engineering Materials 748 (sierpień 2017): 269–74. http://dx.doi.org/10.4028/www.scientific.net/kem.748.269.

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A new self-lubrication concept based on the techniques including of dry grinding and solid lubricating was proposed for green grinding process. And a kind of self-lubrication grinding wheel was designed with solid powder lubricant and centrifugal impeller inside. The self-lubricating was achieved by the blow out of the solid powder lubricant from the inner cavity of the wheel by the centrifugal force to the grinding surface. The experiments were conducted to study the friction and wear properties of the new cylindrical wheel samples manufactured by the proposed concept. The results showed that the flow channel diameters of 1 to 1.5 mm are the best for the blowing out of the solid lubricant to realize the continuous lubricating. After grinding, the surface coating is even, and the sizes of the abrasive particles are relatively uniform with no peeling into blocks. Although there is a certain wear loss of the grinding surface, the wear rate of the particles on the sample wheels is less than that of the traditional grinding wheel. The computational simulation of the self-lubrication wheel is conducted with the RSM method with FLUENT software to analyze the flow field in the wheel cavity of solid lubricant inside, which is meaningful for the study of the motion of the solid lubricant and useful for optimum design of the wheel design to realize the best self-lubricating performance.
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Nainal, Razi, Muhammad Yunus i Saifuddin Saifuddin. "Analisis Kebutuhan Pelumasan saat Kegagalan Sistem Kelistrikan (Black Out) pada Kompresor Boil Off Gas (K-6801) pada Fasilitas LNG Hub". Jurnal Teknologi 23, nr 2 (31.10.2023): 63. http://dx.doi.org/10.30811/teknologi.v23i2.3831.

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The lube oil system in the compressor plays an important role for any rotating equipment because it functions to provide lubrication against the effects of friction on various rotating equipment. This overhead tank works by gravity to distribute lubricating oil from operating speed to zero rpm. The large volume of lube oil provides lubrication to the compressor bearings when the normal circulating flow from the pump stops and is assisted by the backup flow from the overhead tank. The purpose of this approach is to calculate the need for lubrication when an electrical fault occurs in the Boil-off Gas compressor (K-6801). Based on the results of analysis and calculations where the Boil-Off Gas Compressor (K-6801) is the object of observation, the amount of lubricating oil needed for the remaining rounds is 1885 liters while the amount of lubricating oil available in the field is 1528,286 liters. From the calculation results, 1528,286 liters is sufficient based on the reference API Standard 614 edition 4, chapter 2, Section 1.4.10.2 because it has exceeded the 20% reduction from 1885 liters, namely 1508 liters. The height of the overhead tank that is suitable for flowing lubricating oil to the compressor bearings is 5.2588 meters above the compressor with a distribution pipe diameter of 3 inches and an orifice bore diameter of 1 inches.
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Zhang, Jingwei, Yuan Zhang, Yanling Zhao i Wenguang Han. "Research on Lubrication Characteristics of Cage-Free Ball Bearing with Local Functional Slot". Lubricants 11, nr 5 (2.05.2023): 203. http://dx.doi.org/10.3390/lubricants11050203.

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The factors affecting the lubrication effect of a ball bearing without cage and containing a functional slot are analyzed, including the structural parameters of the functional slot, the speed of the rolling element, and the deformation of the contact surface, in order to establish the initial oil volume equation. Based on the multiple mesh method and Matlab programming, the established model is solved by obtaining the distribution rules of oil film pressure, oil film thickness, and oil film flow rate between the rolling element, the conventional raceway, and the functional slot under different speed conditions, and by determining the optimal functional slot depth. Finally, through an experiment performed to verify the lubrication effect of the lubricating oil in the functional slot, the results show that the lubricating oil in the functional slot can have a lubricating effect, and the initial amount of lubricating oil needed increases with an increase in speed.
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Naufal Annafi, Muhammad, Asman Ala i Jarot Delta Susanto. "Optimizing Air Compressor Productivity in Supporting Operational Activities on The Mt Ship. Gamalam". International Journal of Advanced Multidisciplinary 2, nr 2 (14.09.2023): 608–11. http://dx.doi.org/10.38035/ijam.v2i2.304.

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Air compressors are auxiliary machines on board that can produce high pressure air. This research was conducted because the productivity of the air compressor was less than optimal, causing air production and the performance of the air compressor to be less than optimal and disrupting operational activities on the ship. The impact that occurs when air production is reduced in the air compressor, the ship cannot operate according to the contract specified by the company, because the initial start of the main engine or main engine on board requires compressed air. Many factors can cause reduced production of air produced by air compressors, including the lack of performance of the suction valve and exhaust valve on the high pressure section which causes less maximum or longer time for filling air into the air bottle, low flow of the lubrication system on the piston which causes no compression to produce air. This research was carried out with the aim of identifying and analyzing the causes of the lack of performance of the suction and exhaust valves on high pressure sections and low flow of the piston lubrication system which results in less optimal performance of the air compressor when filling into air bottles. The method used in this study uses a qualitative descriptive method using primary and secondary data collection approaches and techniques. The lack of performance of the inlet and exhaust valves can be corrected by cleaning the carbon deposits on the valves and leveling the valve surfaces. The low flow of the lubrication system on the piston can be done by checking the lubricating oil pump, cleaning the lubricating oil filter, changing the lubricating oil periodically according to the instruction manual book, and adding lubricating oil according to the specifications of the air compressor.
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Rozprawy doktorskie na temat "Lubricating flow"

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Secrieru, Egor. "Pumping behaviour of modern concretes –". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-234912.

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Pumping is the most efficient transportation and placing method for concrete. Despite the immense progress in the field of concrete technology in the last years, so far there are still neither official regulations nor verified theoretical foundations to be used for the assessment and accurate prediction pumping behaviour of ordinary and high performance concretes. This thesis aims at purposefully investigating pumping of modern concretes and bridging the existing knowledge gap. The main achievement of the present research is the development and verification of a sitecompliant and scientifically based methodology for characterisation and prediction of fresh concrete pumping behaviour. The research focus is set on the importance of the forming lubricating layer (LL) during pumping. Within an extended experimental program, the properties of the LL are captured and quantified. They determine the reduction of friction at the pipe wallconcrete interface and thereby govern the concrete flow. It is proven that the composition and the rheological properties of the forming LL exert an enormous impact on pumping since most of the induced shear stress by pumping pressure is concentrated in this layer. In a further step, the flow pattern of concrete is analytically and numerically determined. The concrete exhibits various principal flow types which are already defined at low flow rates: plug flow in case of strainhardening cementbased composite (SHCC), partial concrete bulk shear in ordinary concretes and pronounced bulk shear for selfcompacting concrete (SCC). The results from the fullscale pumping campaign are confronted with the existing pressure performance nomogram on the determination of pumping parameters. The nomogram’s prediction capacity is extended and verified for highly flowable concretes by replacing the slump and flow table results with the viscosity parameter of the LL. Furthermore, the challenges during pumping of concrete, inter alia, priming of the pipeline, blockage formation and final cleaning, are exemplified, and recommendations for the practitioners are provided. Finally, the transfer of the developed scientifically based and ready to use methodology on site is strongly advocated as a part of the future in situ rheology monitoring concept towards envisaged full automation of concrete production and casting processes
Das Pumpen stellt die effektivste Methode für das Fördern und Einbringen von Frischbeton auf der Baustelle dar. Trotz der in den letzten Jahren erreichten deutlichen Fortschritte auf betontechnologischem Gebiet existieren für die Beurteilung der Pumpbarkeit von Beton bisher weder offiziell gültige Vorschriften noch abgesicherte theoretische Grundlagen, die eine zielsichere Vorhersage des Pumpverhaltens von Normal- als auch Hochleistungsbetonen ermöglichen. Die vorliegende Arbeit schließt entsprechende Wissenslücken und befasst sich gezielt mit dem Pumpen moderner Betone. Grundlegenden Erkenntnisgewinn stellt die Entwicklung einer wissenschaftlich fundierten, baustellengerechten Prüfmethodik zur Charakterisierung und Vorhersage des Pumpverhaltens von Frischbeton dar. Der Untersuchungsfokus richtet sich auf die Wirkung der sich beim Pumpvorgang ausbildenden Gleitschicht. Ein umfangreiches Untersuchungsprogramm gestattet die Erfassung und Quantifizierung der Eigenschaften dieser Schicht. Sie bestimmen infolge deutlicher Reduzierung der Reibung an der Grenzfläche zwischen Rohrwandung und Beton die Betonströmung entscheidend. Bewiesen wird, dass Betonzusammensetzung und rheologische Eigenschaften der Gleitschicht maßgebende Auswirkungen auf den Pumpvorgang haben, da sich die pumpdruckinduzierte Scherspannung in dieser Schicht konzentriert. Weiterhin erfolgt sowohl eine analytische als auch numerische Charakterisierung der Betonströmung im Rohr. Nachgewiesen wird, dass sich beim Pumpvorgang betonspezifisch unterschiedliche Strömungsarten einstellen, die bereits bei niedrigen Durchflussmengen definiert sind: Pfropfenströmung in hochduktilen Betonen, partielle Scherung des Kernbetons in Normalbetonen und signifikante Scherung in selbstverdichtenden Betonen. Aus großtechnisch durchgeführten Pumpversuchen gewonnene Ergebnisse werden dem derzeit vorhandenen, verbesserungsbedürftigen Betondruck-Leistungs-Nomogramm zur Einstellung von Parametern an der Betonpumpe gegenübergestellt. Die Vorhersagekapazität des Nomogramms kann durch den Ersatz der Ausbreit- bzw. Setzfließmaßangaben mit Viskositätsangaben der Gleitschicht erweitert und verifiziert werden. Des Weiteren werden baustellenbezogene Herausforderungen im Gesamtprozess des Betonpumpvorgangs, u. a. Vorbereitung der Rohrleitung vor dem Pumpen, Auftreten von Stopfern und Endreinigung exemplarisch dargestellt sowie Empfehlungen für die Praktiker erarbeitet. Schließlich wird der Transfer der in dieser Arbeit entwickelten wissenschaftlich basierten und anwendungsbereiten Methodik als Teil des zukünftigen Konzeptes für die in-situ Rheologie-Überwachung hinsichtlich einer angestrebten vollständigen Automatisierung von Fertigungs- und Einbringprozessen von Beton mit Nachdruck empfohlen
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De, Soete Franz. "Ecoulement de gouttes couvertes dans une contraction". Electronic Thesis or Diss., Université Paris sciences et lettres, 2021. http://www.theses.fr/2021UPSLS082.

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L’écoulement de gouttes d'huile dans l’eau à travers la contraction d’un canal présente un intérêt pour de nombreuses applications telles que l’extraction de pétrole ou la microfluidique. Dans la littérature, la condition de bouchage d’un pore soumis à un gradient de pression a été largement étudiée pour les gouttes et les bulles. La relation entre le débit et la pression fait intervenir la différence des pressions de Laplace à l'avant et à l'arrière de la goutte : elle dépend donc des tensions interfaciales à l’avant et à l’arrière. La présence d'espèces adsorbées à la surface abaissant la tension interfaciale, comme des tensioactifs ou des particules colloïdales, modifie donc non seulement le seuil de bouchage mais également la valeur du débit au-dessus de ce seuil. L’objectif de cette thèse est d’étudier l’écoulement, sous gradient de pression imposé, de gouttes dont la surface est initialement saturée de tensioactifs (au-dessus de la CMC) ou de particules à travers la contraction d’un capillaire cylindrique. Nous montrons comment la mesure du débit par analyse d’images permet d’accéder sous certaines hypothèses à une mesure des tensions interfaciales. Dans le cas des tensioactifs, nous mesurons ainsi une augmentation de la tension interfaciale à l’avant qui résulte d’une compétition entre l’effet de l’accroissement de surface et celui d’un transport par effet Marangoni. Dans le cas des gouttes couvertes de particules, nous montrons que la vitesse de la goutte et le rayon des particules adsorbées à sa surface contrôlent le régime d’écoulement. A faible vitesse, le mouillage de l’huile sur la paroi du canal est observé à l’avant de la goutte ; aux vitesses plus élevées, le régime dépend de la taille des particules comparée à l’épaisseur du film de lubrification, suivant les cas, un frottement des particules sur la paroi du canal, ou un régime de lubrification visqueuse sont observés. Ces régimes sont responsables d’une accumulation plus ou moins importante des particules à l’arrière de la goutte, y diminuant la tension interfaciale et donnant lieu à différents mécanismes de déstabilisation de l’interface. Pour les deux systèmes, nous montrons que la présence d’espèces adsorbées affecte peu la condition de bouchage. En revanche, nous mesurons une augmentation du temps de passage des gouttes couvertes de tensioactifs ou de particules résultant du couplage entre l’écoulement de la goutte et les dynamiques interfaciales
The flow of oil drops in water through a constricted channel is of interest for many applications such as oil extraction or microfluidics. In the literature, the condition of pore clogging under a pressure gradient has been extensively studied for drops and bubbles. The relation between flowrate and pressure involves the difference in Laplace pressures at the front and back of the drop, and thus the interfacial tensions at the front and the back. The presence of species adsorbed on the surface lowering the interfacial tension, such as surfactants or colloidal particles, therefore modifies not only the clogging threshold but also the value of the flowrate above this threshold. The objective of this thesis is to study the flow, under an imposed pressure gradient, of drops whose surface is initially saturated with surfactants (above the CMC) or with particles, through cylindrical constricted capillaries. We show how measurements of flowrate by image analysis can provide measurements of the interfacial tensions. In the case of surfactant-laden drops, we measure an increase in the interfacial tension at the front which results from a competition between the surface expansion effects and the transport by a Marangoni effect. In the case of particle-laden drops, we show that both the velocity of the drop and the radius of the particles adsorbed on its surface control the flow regime. At low velocities, the wetting of oil on the capillary walls is observed at the front of the drop; at larger velocities, the flow depends on the particle size compared to the thickness of the lubricating film, according to this criterion either the occurence of friction of the particles on the channel walls or a viscous lubrication regime are observed. These regimes are responsible for a greater or lesser accumulation of particles at the back of the drop, decreasing the back interfacial tension and giving rise to various mechanisms of interface destabilization. For both systems, we show that the presence of adsorbed species has little effect on the clogging condition. Nevertheless, we measure an increase in the passage time of the drops covered with surfactants or particles, which results from the coupling of interfacial dynamics and flow through the contraction
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Ritchie, Jeremey Alexander. "The Boundary Element Method in lubrication analysis". Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329039.

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VASQUEZ, JULIO RAUL SIERRA. "DRAG REDUCTION IN LAMINAR FLOW BY LUBRICATION OF GROOVED WALLS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2009. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=15347@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
Objetivo: Uma parte significativa das reservas mundiais de petróleo é encontrada na forma de óleos pesados. Estes óleos pesados possuem alta viscosidade de 100 - 10000 cP, que torna seu transporte altamente complexo e custoso. Vários métodos foram desenvolvidos para reduzir a perda de carga de escoamentos laminares de óleos de alta viscosidade. Entre os mais utilizados, pode-se citar o bombeio de um fluido de baixa viscosidade perto da parede do tubo com o óleo viscoso sendo transportado no centro, conhecido como core-annular flow. Neste trabalho, uma alternativa ao core-annular flow é estudada. O método é baseado na utilização de micro ranhuras da parede do duto preenchidas com um liquido de baixa viscosidade. Este método tem o potencial de evitar alguns dos problemas que ocorrem no uso de core-annular flow. A análise do efeito das diferentes propriedades dos fluidos, condições de operação, geometria das ranhuras na perda de carga do escoamento foi feita através de um estudo numérico e experimental. Resultados indicam as limitações e potencialidade do uso de micro ranhuras na reduçãode perda de carga de escoamento laminar.
Objective: A significant portion of the world oil reserves is found in the form of heavy oil. These oils have a high values of viscosity around 100-10000 cP, that makes their transportation complex and expensive. Several methods have been developed to reduce the pressure drop in laminar flows of high viscosity oils. Among them is the solution of pumping a liquid of lower viscosity near the pipe wall with the high viscosity oil flowing in the center. This method is known as Core-annular flow. In this work, an alternative to core-annular flow is studied. The method is based on the use of micro grooves in the pipe wall filled with a liquid of smaller viscosity. This method has the potential to elude some problems that occur with the core-annular flow method. The analysis of the drag reduction effect as a function of different fluids properties, operational conditions and geometry of the grooved walls was made using a numerical and experimental approach. Results indicate the limitations and potential of using micro grooves for drag reduction in laminar flows of high viscosity fluids.
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Blazquez, Martin Maria Isabel. "Wall friction and lubrication in powder flows". Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46678.

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Dunbrack, Geoffrey E. "Interfacial effects in visco-plastic lubrication flows". Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/44933.

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Poiseuille flows with yield stress fluids produce an unyielded central plug which can act as a solid conduit surrounding central (core) flows of Newtonian or power law fluids. Effectively, the annular yield stress fluid acts as a lubricant that isolates the core flow from wall friction. Stable flows with a yield stress annular fluid and a Newtonian or power law core fluid are termed viso-plastic lubrication (VPL) flows. This study examined interfacial effects in vertical VPL Poiseuille flows using a carbopol solution as the annular (yield stress) fluid and xanthan (inelastic shear thinning fluid) or polyethlyeneoxide (PEO; an elastic shear thinning fluid) as the core fluids. Experiments with the inelastic core fluid (xanthan) involved introducing stepped (high to low) or pulsed (high to low to high) changes in the core flow to an established stable VPL flow. Step changes produced a "yield front" (narrowing of the core flow or "interfacial radius") that propagated upward at a velocity considerably greater than the velocity of the annular carbopol plug but close to the average velocity of the xanthan core flow following the step change. Pulsed changes in the core flow produced one of three outcomes depending on the magnitude of the flows preceding and following the step change: (1) a stable ("frozen in") deformation in the carbopol/xanthan interface that moved upward at the velocity of the carbopol plug,(2) no persistent deformation of the interface, or (3) a breakdown of the stable VPL flow characterized by extensive mixing of the core and annular flows. Experiments with the elastic core fluid (PEO) involved introducing multiple pulsed changes (high/low/high, high/low/high, ...) in the core flow to an established VPL flow. These pulsed changes typically produced linked multiple diamond shaped stable deformations ("diamond necklace") in the interface that moved upwards at the velocity of the carbopol plug. The frequency and amplitude (maximum radius) of the diamond deformations could be controlled by the timing of pulses and the respective flow rates, but not the diamond shape itself which appears to be a consequence of the complex rheology of the fluids.
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Sykes, Paul. "Lubrication flows of semi-dilute fibre suspensions". Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627460.

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Fenton, Marcus Brian Mayhall. "Flow and heat transfer modelling of an automotive engine lubrication system". Thesis, University of Warwick, 1994. http://wrap.warwick.ac.uk/3494/.

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This dissertation documents the thermodynamic and fluid mechanic analysis of an engine lubrication system. A comprehensive thermofluid computer model was developed to provide a flexible design analysis tool for the accurate prediction of oil pressures, flow rates and temperatures at any point within any lubrication system. Technical and financial support for the study was provided by Jaguar Cars. A comprehensive literature review revealed that the past research in this field had concentrated on either the thermofluid analysis of the lubrication system by engine testing, or the detailed analysis of individual components. A small number of computer models were developed for the flow analysis of the whole lubrication system. However, these models had limited heat transfer prediction capabilities, some requiring measured engine temperature data, and were not flexible enough to be employed as design tools. The objective of this study was to develop a flexible steady-state thermofluid design analysis tool, by integrating a flow analysis approach with a detailed analysis of the heat transfer within the engine block. Mathematical models of the thermofluid behaviour of the lubrication system components were developed and were implemented in a suite of FORTRAN computer programs which formed the design analysis package. A simple, linear flow model was initially developed to represent the system with a combination of laminar pipes, pumps, filters, journal bearings, crank-shaft transfer holes and cam bearing transfer holes. The linear program provided a rapid analysis tool, but the accuracy of the results were limited by the simplified flow characteristics of the system components. A more comprehensive and flexible non-linear flow model was developed, which solved for the unknowns with an iterative technique. Additional component models with non-linear flow characteristics, such as turbulent pipes, annular pipes, strainers, and oil coolers, were developed. The non-linear solution technique was proven to be robust and flexible and was subsequently used in all the analysis programs. The heat transfer to the oil within the pressurised part of the lubrication system is modelled by the heat transfer program. The engine block temperatures are calculated by the engine block program. This program accounts for the heat transfer to the oil splashed on to the internal surfaces of the engine. The engine geometry is represented by a series of block elements and modelled as a nodal resistance network. This capability has particular importance during the design stage, rapidly providing an estimate of the temperature profile through the engine block, results which were previously only available from expensive and slow FEA models. It was shown that both the Jaguar AJ6 and V8 engine lubrication systems could be analyzed in great detail. Engine tests showed that the predicted flow rates, pressures and temperatures were in excellent agreement with measured values. The overall accuracy of the results induced a high degree of confidence in the thermofluid model. The final analysis package was proven to be easy to use, robust, rapid, flexible and accurate. The design analysis package, developed during the course of this study, represents a unique stand-alone simulation tool which can rapidly analyze any engine lubrication system configuration. This package provides a valuable analysis tool which can be used to optimise system designs at the initial design stage and the diagnosis of performance problems during the development phase. Parametric studies can be easily carried out on the lubrication system and engine block configuration to identify areas which can enhance heat transfer to the oil. The steady-state analysis package forms an excellent platform for the development of a full transient model. This would allow a detailed analysis of the lubrication system during engine warm-up, with the aim of reducing engine emissions and determining minimum oil requirements.
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Li, Jinxia. "Lubricating grease Experiments and modeling of wall-bounded- and free-surface flows". Doctoral thesis, Luleå tekniska universitet, Maskinelement, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26489.

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Lubricating grease is commonly applied to lubricate e.g. rolling bearings, sealsand gears. Grease has some clear advantages over lubricating oil: it is a semisolidmaterial, which prevents it from flowing/ leaking out from the bearingsystem and gives it sealing properties, and it also protects the system fromcontaminants and corrosion. Due to its consistency, lubricating grease has manyadditional advantages over lubricating oil: it does not require pumps, filters andsumps. However, the rheology of grease makes it more difficult to measure andstudy its flow dynamics. This study focuses on the influence of rheology ongrease flow in different geometries involving a straight channel with restrictions,concentric cylinder geometry, and free-surface flow on a rotating disc.To better understand grease flow in bearings and seals, two types of flowrestrictions were applied into the straight channel in order to simulate the flowof grease near a seal pocket. In the case of a single restriction, the horizontaldistance required for the velocity profile to fully develop is approximately thesame as the height of the channel. In the corner before and after the restriction,the velocities are very low and part of the grease is stationary. For the channelwith two flow restrictions, this effect is even more pronounced in the narrowspace between the restrictions. Clearly, a large part of the grease is not moving.This condition particularly applies in the case of a low-pressure gradient andwhere high-consistency grease is used. In practice this means that grease may belocally trapped and consequently old/contaminated grease will remain in theseal pockets.A configuration comprising a rotating shaft and two narrow gap sealing-likerestrictions (also called Double Restriction Seal, DRS) was designed to simulatea sealing contact. Two different gap heights in the DRS have been used tocompare the grease flow. It is shown that partially yielded grease flow isdetected in the large gap geometry and fully yielded grease flow in the small gapgeometry. For the small gap geometry, it is shown that three distinct grease flowregions are present: a slip layer close to the stationary wall, a bulk flow layer,and a slip layer near the rotating shaft. The shear thinning behaviour of thegrease and its wall slip effects have been determined and discussed.Free-surface flow of grease occurs in a variety of situations such as during relubrication and inside a rolling element bearing which is filled to about 30%with grease in order to prevent heavy churning. Here the reflow of lubricant tothe bearing races is a key point in the lubricant film build-up, and centrifugalforces have a direct impact on the amount of available grease. Understanding ofthe free-surface flow behaviour of grease is hence important for theunderstanding of the lubrication mechanism. Adhesion and mass loss aremeasured for greases with different rheology on different surfaces andtemperatures. It is shown that the critical speed at which the grease starts tomove is mostly determined by grease type, yield stress and temperature ratherthan surface material. A developed analytical model covers a stationary analysisof the flow resulting in solutions for the velocity profile of the grease as well as asolution for the thickness of the viscous layer remaining on the disc.
Godkänd; 2014; 20141017 (jinlit); Nedanstående person kommer att disputera för avläggande av teknologie doktorsexamen. Namn: Jinxia Li Ämne: Maskinelement/Machine Elements Avhandling: Lubricating Grease Experiments and Modellingo f Wall-Bounded and Free-Surface Flours Opponent: Professor Arto Lehtovaara, University of Technology, Tampere, Finland Ordförande: Professor Erik Höglund, Institutionen för teknikvetenskap och matematik, Luleå tekniska universitet Tid: Fredag den 19 december 2014, kl 09.00 Plats: E632, Luleå tekniska universitet
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Iskandar, Youssef. "Optimization of minimum quantity cooling / lubrication machining of composites through flow visualization". Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=119384.

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Modern machining involves more dependence on green manufacturing techniques. Minimum Quantity Cooling Lubrication (MQCL) of machining processes has replaced conventional flood cooling in many applications, involving various materials and cutting conditions. The use of this technique results in considerable reductions in the quantity of lubricant used, reducing manufacturing costs as well as the impact of the process on the environment. With the objective of achieving a fuller understanding of this technology, an interest has been taken in the properties of the aerosol, and their impact on machining performance. This study presents an attempt to understand these properties through the use of experimental and numerical flow visualization techniques, followed by machining experiments. The Particle Image Velocimetry study revealed how the MQCL nozzle geometry and the injection parameters (air and lubricant flow rates) which control the Sauter Mean Diameter (SMD) of the resulting droplets, affect the flow, and that droplets with smaller SMD are more capable of following the air flow. Computational Fluid Dynamics simulations showed that a single-phase (air only) simulation is sufficient in describing the flow, when comparing the simulation and experimental (real flow) PIV results. They also revealed that the potential thermal benefits of the air flow can be achieved if the nozzle orientation vis-à-vis a model tool is exploited. Comparisons of MQCL with conventional flood cooling and dry machining modes in milling of Carbon-Fibre Reinforced Plastics (CFRP) revealed that the benefit of MQCL (namely lower tool wear and higher geometric accuracy of the machined part), can be achieved if the atomization parameters are set for appropriate lubrication and SMD size.
L'usinage moderne implique plus de dépendance des techniques de manufacture verte. La micro-lubrification (Minimum Quantity Cooling Lubrication) des processus d'usinage a remplacé l'arrosage conventionnel dans le cas de plusieurs applications, impliquant des matériaux et des conditions d'usinage variés. L'usage de cette méthode mène à des réductions considérables de la quantité de lubrifiant utilisé, réduisant ainsi les coûts de fabrication ainsi que l'impact du processus sur l'environnement. Un intérêt a été porté aux propriétés de l'aérosol, et leurs effets sur la qualité de l'usinage, ayant pour objectif une meilleure compréhension de cette technologie. Cette étude est une tentative de mieux comprendre ces propriétés à travers l'usage des techniques de visualisation de débit expérimentaux et numériques, suivis par des essais d'usinage. L'étude Particle Image Velocimetry (PIV) a démontré comment la géométrie de la buse el les paramètres d'injection (débits d'air et de lubrifiant) qui contrôlent la taille du diamètre moyen de Sauter (SMD) des gouttelettes résultantes, affectent le débit, mais aussi que les bulles ayants les tailles SMD les plus petites sont les plus efficace lorsqu'il s'agit de suivre le débit de l'air. Des essais numériques (Computational Fluid Dynamics) ont démontré que des simulations monophasiques (air seulement) sont suffisantes pour bien décrire le débit, en comparant avec les résultats du PIV (débit réel). Ils ont aussi démontré que les avantages thermiques de l'air peuvent être obtenus si la position de la buse vis à vis de l'outil est exploitée. Des comparaisons entre l'MQCL et de arrosage conventionnel et usinage à sec lors d'essais de fraisage de plastique à renfort fibre de carbone (PRFC) ont montré que les avantages de l'MQCL, notamment un usage réduit et une plus grande efficacité géométrique de la pièce usinée, peuvent être obtenus si les paramètres d'atomisation sont choisis pour une lubrification suffisante et taille SMD appropriée.
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Książki na temat "Lubricating flow"

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R, Jones William. Long term performance of a retainerless bearing cartridge with an oozing flow lubricator for spacecraft applications. [Washington, DC]: National Aeronautics and Space Administration, 1997.

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R, Jones William. Long term performance of a retainerless bearing cartridge with an oozing flow lubricator for spacecraft applications. [Washington, DC]: National Aeronautics and Space Administration, 1997.

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J, Hamrock Bernard, Brewe David E i Lewis Research Center, red. Starvation effects on the hydrodynamic lubrication of rigid nonconformal contacts in combined rolling and normal motion. [Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1986.

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Harold, Ramkissoon, i International Union of Theoretical and Applied Mechanics., red. IUTAM Symposium on Lubricated Transport of Viscous Materials: Proceedings of the IUTAM symposium held in Tobago, West Indies, 7-10 January 1997. Dordrecht: Kluwer Academic Publishers, 1998.

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Innes, Graeme E. Laminar-to-turbulent transition in tilting-pad bearings. [Toronto: s.n.], 1989.

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Burton, Ralph A. Heat, Bearings, and Lubrication: Engineering Analysis of Thermally Coupled Shear Flows and Elastic Solid Boundaries. New York, NY: Springer New York, 2000.

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D, Vijayaraghavan, United States. National Aeronautics and Space Administration. i U.S. Army Research Laboratory., red. Film temperatures in the presence of cavitation. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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D, Vijayaraghavan, United States. National Aeronautics and Space Administration. i U.S. Army Research Laboratory., red. Film temperatures in the presence of cavitation. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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United States. National Aeronautics and Space Administration. i U.S. Army Research Laboratory., red. An efficient numerical procedure for thermodydrodynamic [sic] analysis of cavitating bearings. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Oil flow studies at low temperatures in modern engines. W. Conshohocken, PA: ASTM, 2000.

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Części książek na temat "Lubricating flow"

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Murakami, T., S. Yukawa i N. Ito. "Molecular Dynamics Simulation of Lubricating Films". W Traffic and Granular Flow’01, 575–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-10583-2_61.

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Meier, Trixi, Michael Lermer, Daniel Gross i Nico Hanenkamp. "Influence of Additivation of Bio-Based Lubricants on Sprayability and Solubility for Cryogenic Minimum Quantity Lubrication". W Lecture Notes in Mechanical Engineering, 139–47. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-28839-5_16.

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AbstractThe development of innovative cooling lubrication strategies is significantly driven by the need to machine materials resistant to high temperatures while taking into account both ecological and economic aspects. Cryogenic minimum quantity lubrication (CMQL) represents a compromise satisfying both efficiency and sustainability in the manufacturing process. A minimal amount of oil is added to the cryogenic medium carbon dioxide (CO2) to ensure both cooling and lubrication during tool engagement. In this context, vegetable oils, so-called triglycerides, can be used with respect to the cooling lubrication concept. The aim of this paper is to analyze various bio-based oils with regard to their solubility, spraying and flow behavior and to investigate the influence of additives on the performance. During the lubrication tests, the additives have shown no influence on the lubricating effects. Thus the chemical properties of the base oils primarily influence the properties with regard to solubility and spray behavior. Finally, the collected results were correlated with machining tests showing only a limited correlation with the aforementioned lubrication tests.
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Dang, Chaobin, Shizuo Saito i Eiji Hihara. "Flow Boiling Heat Transfer of Low GWP Refrigerant R1234yf with the Entrancement of Lubricating Oil in Small Diameter Tubes". W Variable Refrigerant Flow Systems, 25–43. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6833-4_3.

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Li, Guangle, Guangle Zeng, Huiqing Jiang i Haijun Shen. "Numerical Simulations on the Heat Transfer and Flow Performance of Lubricating Oil in an Air/Lubricating Oil Heat Exchanger". W Lecture Notes in Mechanical Engineering, 409–15. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-8867-9_39.

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Miyamoto, Shunsuke, Hideyuki Sakai, Toshihiko Shiraishi i Shin Morishita. "A Flow Modeling of Lubricating Greases Under Shear Deformation by Cellular Automata". W Lecture Notes in Computer Science, 383–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11861201_45.

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Langlois, William E., i Michel O. Deville. "Lubrication Theory". W Slow Viscous Flow, 229–49. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-03835-3_9.

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Brenn, Günter. "Lubrication Flow". W Mathematical Engineering, 85–100. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-51423-8_4.

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Burton, Ralph A. "Steady Turbulent Couette Flow". W Heat, Bearings, and Lubrication, 60–67. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1248-5_8.

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Gaca, Hans, Jan Ruiter, Götz Mehr i Theo Mang. "Flow Limiters in Circulating Lubrication". W Encyclopedia of Lubricants and Lubrication, 639–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-22647-2_106.

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Burton, Ralph A. "Transient Seizure with Turbulent Flow". W Heat, Bearings, and Lubrication, 68–72. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1248-5_9.

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Streszczenia konferencji na temat "Lubricating flow"

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Delgado, M. A. "Processing and Formulation of Lithium Lubricating Greases". W FLOW DYNAMICS: The Second International Conference on Flow Dynamics. AIP, 2006. http://dx.doi.org/10.1063/1.2204502.

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Sarmadi, Parisa, Sarah Hormozi i Ian A. Frigaard. "Stable Triple-Layer Lubricated Pipeline Flow". W ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19094.

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Abstract Recently we have introduced a novel methodology for efficient transport of heavy oil via a triple-layer core-annular flow [1]. Pumping pressures are significantly reduced by concentrating high shear rates to a lubricating layer, while ideas from visco-plastic lubrication were used to eliminate interfacial instabilities. We purposefully position a shaped unyielded skin of a visco-plastic fluid between the transported oil and the lubricating fluid layer. The shaping of the skin layer allows for lubrication forces to develop and balance the density difference between the fluids. Here we show an explicit advantage of the proposed method. Essentially the method can give stable flows for a very wide range of fluid input ratio, although not all will produce the desired reduction in frictional pressure losses. Additionally, we use the extensional flow method derived in [2] to estimate the required yield stress to maintain the skin completely unyielded.
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Delgado, M. A., J. M. Franco, C. Valencia, E. Kuhn, C. Gallegos, Albert Co, Gary L. Leal, Ralph H. Colby i A. Jeffrey Giacomin. "Transient Shear Flow of Model Lithium Lubricating Greases". W THE XV INTERNATIONAL CONGRESS ON RHEOLOGY: The Society of Rheology 80th Annual Meeting. AIP, 2008. http://dx.doi.org/10.1063/1.2964609.

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Tontiwachwuthikul, Paitoon, Isam Al Zubaidi, Eva Rennie, Spencer Schubert, Magda Seitz i Cassandra Selinger-Silva. "Remediation of Water from Waste Lubricating Oil Spill Using Potato Peels". W International Conference of Fluid Flow, Heat and Mass Transfer. Avestia Publishing, 2016. http://dx.doi.org/10.11159/ffhmt16.163.

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Li, Wang-Long. "Effects of Electrokinetic Slip Flow on Lubrication Theory". W ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44167.

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A lubrication theory that includes the effects of electric double layer (EDL) and boundary slip is developed. Both effects are important in microflow, and thus in lubrication problems. They have opposite effects on velocity distributions between lubricating surfaces. Also, the velocity distribution induced by the EDL stream potential (electroviscous effect) is affected by the boundary slip. Under the usual assumptions of lubrication and Debye-Hu¨ckel approximation for low surface potential, the Navier-Stokes equation with body force due to the electrical potential as well as the widely accepted Navier slip boundary conditions is utilized on deriving the modified Reynolds equation. Effects of EDL and boundary slip on the 1-D bearing performance are discussed by solving the modified Reynolds equation numerically.
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Mancò, S., N. Nervegna, M. Rundo i G. Armenio. "Displacement vs Flow Control in IC Engines Lubricating Pumps". W SAE 2004 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2004. http://dx.doi.org/10.4271/2004-01-1602.

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Arisawa, Hidenori, Katsuya Umemoto, Atsushi Ueshima i Yuichi Kawamoto. "CFD Simulation of the Lubricating Oil Flow in Motorcycle Oilpan". W Small Engine Technology Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2003. http://dx.doi.org/10.4271/2003-32-0080.

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Aroussi, Abdelwahab, Gazala Ishaq i Mohammed Menacer. "Measurement of Gas/Liquid Flow Velocities in Rapidly Rotating Annular Systems". W ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45561.

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To help understand the behaviour of oil/gas mixtures and the lubrication processes within bearing chambers of an aero-engine, a rig was developed to represent the bearing chamber at a simplified level. The velocities of gas and liquid flow prevailing around the rapidly rotating annulus were explored when exposed to various parametric conditions. The results revealed that the liquid flowrates, aerodynamic forces and shaft rotation speeds affect the phenomena of gas/liquid flows. Changes in these conditions profoundly affect the behaviour of the lubricating jet, the sizes of the liquid droplets and their velocities as well as the liquid films. These, consequently influence the heat transfer and lubrication mechanisms within annular systems.
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Zubaidi, Isam Al, Mustafa Al Zubaidi, Mehr Tajik, Mohammed Al Zubaidi, Megren Al Mutairi, Mahfuza Sheikh, Ying Chen, Muntadher Al-Yasiri i Ahmed Alsudays. "Pomegranate Peels Powder for the Remediation of Oil Polluted Water from Waste Lubricating Oil". W International Conference of Fluid Flow, Heat and Mass Transfer. Avestia Publishing, 2018. http://dx.doi.org/10.11159/ffhmt18.159.

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Wu, Qiongxiao, Jianjun Wang, Jingming Chen i Pengzheng Li. "Simulation Analysis and Optimization of Lubricating Oil System". W 2021 28th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icone28-64547.

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Abstract Based on the one-dimensional simulation model of lubricating oil system is established and analyzed by using FLOWMASTER software, this paper proposes a new method of optimizing lubricating oil system by PID technology. Ensure that the configuration requirements and control strategies of the relevant accessories of the simulation model are satisfied with the design requirements. Firstly, by simulating lubricating oil pressure fluctuation and lubricating oil flow distribution under Open/Close Valve in different opening and closing time, the optimal opening/closing time of Open/Close Valve is determined to be 0.2 s and 0.5 s respectively. Secondly, by writing the controller script file combined with a controller to realize automatic unloading relief valve simulation, determine the relief valve pressure regulating range of 0∼0.38 MPa, For precision of constant pressure valve of oil spill, the simulation results show that the average 10 m3/h flow caused by pressure changes of about 0.06 MPa. Under the flow sudden change signal of about 40 m3/h, the maximum pressure change is less than 0.1 MPa. Through the simulation results, it is found that most of the lubrication parts in the original design have the phenomenon of flow redundancy, which causes unnecessary pump power loss. The system is optimized by PID technology. By comparing the simulation results before and after optimization, it is found that the speed of constant displacement pump could be changed in time by PID controller, and the flow redundancy could be improved significantly, so the lubricating oil system could be lower consumption and achieve the purpose of optimization.
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Raporty organizacyjne na temat "Lubricating flow"

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Moritsugu, Michiyasu, Tadayoshi Nakase, Makoto Okada, Yasuyuki Haseo, Kouji Morioka i Kei Yuasa. CVT Fluid Flow Rate Measurement in CVT Lubricating Systems. Warrendale, PA: SAE International, wrzesień 2005. http://dx.doi.org/10.4271/2005-08-0413.

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Lever, James, Susan Taylor, Garrett Hoch i Charles Daghlian. Evidence that abrasion can govern snow kinetic friction. Engineer Research and Development Center (U.S.), grudzień 2021. http://dx.doi.org/10.21079/11681/42646.

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The long-accepted theory to explain why snow is slippery postulates self-lubrication: frictional heat from sliding melts and thereby lubricates the contacting snow grains. We recently published micro-scale interface observations that contradicted this explanation: contacting snow grains abraded and did not melt under a polyethylene slider, despite low friction values. Here we provide additional observational and theoretical evidence that abrasion can govern snow kinetic friction. We obtained coordinated infrared, visible-light and scanning-electron micrographs that confirm that the evolving shapes observed during our tribometer tests are contacting snow grains polished by abrasion, and that the wear particles can sinter together and fill the adjacent pore spaces. Furthermore, dry-contact abrasive wear reasonably predicts the evolution of snow-slider contact area and sliding-heat-source theory confirms that contact temperatures would not reach 0°C during our tribometer tests. Importantly, published measurements of interface temperatures also indicate that melting did not occur during field tests on sleds and skis. Although prevailing theory anticipates a transition from dry to lubricated contact along a slider, we suggest that dry-contact abrasion and heat flow can prevent this transition from occurring for snow-friction scenarios of practical interest.
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Orloff, D. I., B. Hojjatie i F. Bloom. High-intensity drying processes: Impulse drying modeling of fluid flow and heat transfer in a crown compensated impulse drying press roll, The lubrication problem. Annual report. Office of Scientific and Technical Information (OSTI), sierpień 1994. http://dx.doi.org/10.2172/278193.

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