Thematische Bibliographien / Fluid film development

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Auswahl der wissenschaftlichen Literatur zum Thema „Fluid film development“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 17. Februar 2022

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Zeitschriftenartikel zum Thema "Fluid film development"

Hashimoto, H. „Viscoelastic Squeeze Film Characteristics With Inertia Effects Between Two Parallel Circular Plates Under Sinusoidal Motion“. Journal of Tribology 116, Nr. 1 (01.01.1994): 161–66. http://dx.doi.org/10.1115/1.2927034.

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In this paper, viscoelastic squeeze film characteristics subjected to fluid inertia effects are investigated theoretically in the case of parallel circular type squeeze films. In the development of modified lubrication equations, the nonlinear Maxwell model combining the Rabinowitsch model and Maxwell model is used as a constitutive equation for the viscoelastic fluids, and the inertia term in the momentum equation is approximated by the mean value averaged over the film thickness. Applying the modified lubrication equation to parallel circular type squeeze films under sinusoidal motion, the variation of the pressure distribution with time is calculated numerically for various types of fluids such as Newtonian, pseudo-plastic, linear Maxwell and nonlinear Maxwell fluids. Some numerical results are presented in graphic form, and the effects of inertia forces on the viscoelastic squeeze film characteristics are discussed.

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Lin, Jaw-Ren, Tzu-Chen Hung und Shu-Ting Hu. „Effects of fluid inertia forces in ferrofluid lubricated circular stepped squeeze films – Shliomis model“. Industrial Lubrication and Tribology 68, Nr. 6 (12.09.2016): 712–17. http://dx.doi.org/10.1108/ilt-09-2015-0122.

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Purpose This paper aims to study the inertia squeeze film characteristics between ferrofluid-lubricated circular stepped disks. Owing to the development of modern machine systems, the application of ferrofluids has received great attention. Because the circular disks are a special situation of circular stepped squeeze films, a further study of fluid inertia force effects on the ferrofluid-lubricated circular stepped squeezing mechanism is motivated. Design/methodology/approach On the basis of the ferrohydrodynamic flow model of Shliomis incorporating the momentum integral method, the effects of fluid inertia forces in ferrofluid-lubricated circular stepped squeeze films in the presence of external magnetic fields are investigated in this study. Analytical solutions of squeeze film performances are derived. Findings The fluid inertia force effects provide an increased load capacity and a longer squeeze film time for the ferrofluid-lubricated circular stepped squeeze film, especially for a larger value of the inertia parameter, the Langevin parameter and the volume concentration and a smaller value of the radius ratio and the step height ratio. Originality/value For engineering applications, numerical tables for squeeze film loads of circular stepped disks are also provided in this paper.

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ROY, R. VALÉRY, A. J. ROBERTS und M. E. SIMPSON. „A lubrication model of coating flows over a curved substrate in space“. Journal of Fluid Mechanics 454 (10.03.2002): 235–61. http://dx.doi.org/10.1017/s0022112001007133.

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Consider the three-dimensional flow of a viscous Newtonian fluid upon an arbitrarily curved substrate when the fluid film is thin as occurs in many draining, coating and biological flows. We drive the lubrication model of the dynamics of the film expressed in terms of the film thickness. The comprehensive model accurately includes the effects of the curvature of the substrate, via a physical multiple-scale approach, and gravity and inertia, via more rigorous centre manifold techniques. This new approach theoretically supports the use of the model over a wide range of parameters and provides a sound basis for further development of lubrication models. Numerical simulations exhibit some generic features of the dynamics of such thin fluid films on substrates with complex curvature: we here simulate a film thinning at a corner, the flow around a torus, and draining of a film down a cylinder. The last is more accurate than other lubrication models. The model derived here describes well thin-film dynamics over a wide range of parameter regimes.

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Morita, Masafumi, Kazuhiro Doi, Masahito Miki, Hideyuki Ozawa und Yoshiyuki Ishimaru. „Development of an artificial joint with excellent fluid film lubrication performance“. Iryou kikigaku (The Japanese journal of medical instrumentation) 84, Nr. 5 (2014): 557–65. http://dx.doi.org/10.4286/jjmi.84.557.

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Morita, Masafumi, Akihiro Kagami, Kazuhiro Doi und Masahito Miki. „Development of an artificial joint with excellent fluid film lubrication performance“. Iryou kikigaku (The Japanese journal of medical instrumentation) 85, Nr. 1 (2015): 2–9. http://dx.doi.org/10.4286/jjmi.85.2.

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MAKHOVA, N. N., und A. Yu BABIN. „DEVELOPMENT OF ANN-BASED PID CONTROLLER FOR ACTIVE FLUID-FILM BEARING CONTROL“. Fundamental and Applied Problems of Engineering and Technology 6 (2020): 94–100. http://dx.doi.org/10.33979/2073-7408-2020-344-6-94-100.

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The article proposes a method for controlling an active fluid-film bearing, based on the use of a classical PID controller in conjunction with an artificial neural network. The regulator coefficients are not constant numbers, but are chosen by the network depending on the state of the controlled system. To implement such a control scheme, the coefficients are selected using a particle swarm optimization algorithm, which constitutes the training dataset, and an ANN is trained using the dataset. The controlled object is represented with a model operating in the Simulink environment.

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Peng, Tiefeng, Xuechao Gao, Qibin Li, Siyuan Yang und Qizhong Tang. „Modelling of disjoining pressure for Lennard-Jones free thin films“. Modern Physics Letters B 30, Nr. 10 (20.04.2016): 1650169. http://dx.doi.org/10.1142/s0217984916501694.

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Development of disjoining pressure was performed to study the symmetric, Lennard-Jones (LJ) free thin films using molecular modelling. A methodology rooted from film thermodynamics was established to derive the disjoining pressure isotherm [Formula: see text], which is based on the surface tension at varied film thicknesses and can be viewed as a post-processing technique. The results showed that the disjoining pressure of LJ fluid is purely attractive. Compared with the complicated method reported previously, this methodology is demonstrated to be more convenient and readily applicable for other liquid films (e.g. water, aqueous thin films containing electrolyte or surfactants), meanwhile it can be applied at both low and high temperatures.

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Kim, Joon Hyun, und Joo-Hyun Kim. „Thermohydrodynamic Analysis of Surface Roughness in the Flow Field“. Journal of Tribology 127, Nr. 2 (01.04.2005): 293–301. http://dx.doi.org/10.1115/1.1828072.

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The study deals with the development of a thermohydrodynamic (THD) computational procedure for evaluating the pressure, temperature, and velocity distributions in fluid films with a very rough geometry. A parametric investigation is performed to predict the bearing behaviors in the lubricating film with the absorbed layers and their interfaces as determined by rough surfaces with Gaussian distribution. The layers are expressed as functions of the standard deviations of each surface to characterize flow patterns between both rough surfaces. Velocity variations and heat generation are assumed to occur in the central (shear) zone with the same bearing length and width. The coupled effect of the surface roughness and shear zone dependency on the hydrodynamic pressure and temperature has been found in the noncontact mode. The procedure confirms the numerically determined relationship between the pressure and film gap, provided that its roughness magnitude is smaller than the fluid film thickness.

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Senthilkumar, K., und C. Vijaya. „Formulation Development of Mouth Dissolving Film of Etoricoxib for Pain Management“. Advances in Pharmaceutics 2015 (26.01.2015): 1–11. http://dx.doi.org/10.1155/2015/702963.

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Etoricoxib is a potent, orally active, and highly selective COX-2 inhibitor that exhibits anti-inflammatory, analgesic, and antipyretic activities. The present research was undertaken to develop mouth dissolving films of etoricoxib to have rapid onset of action. Mouth dissolving film (MDF) is a better alternate to oral disintegrating tablets due to its novelty, ease of use, and the consequent patient compliance. Solubility enhancement and taste masking of etoricoxib were the two challenges solved by formulating drug-inclusion complex with beta-cyclodextrin (BCD). MDF prepared by solvent casting etoricoxib-BCD complex along with HPMC as film forming polymer was found to possess desirable physicomechanical properties. In vitro release of etoricoxib from MDF in simulated salivary fluid and 0.1 N HCl was more than 95% within 2 minutes. Taste masking and in vivo disintegration were in acceptable range as assessed by human volunteers. Etoricoxib MDF was further characterized by differential scanning calorimetry, powder X-ray diffraction, and scanning electron microscopy. The index of analgesia shown by etoricoxib MDF was comparable to that of immediate release tablets (100% activity within 40 minutes) in animal studies. Conclusively, the present study documents the development of a commercially viable formula for an MDF of etoricoxib with rapidity in pain management.

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Dissertationen zum Thema "Fluid film development"

Rowan, D. „Design and development of a high-speed test facility and the measurement of the fluid film characteristics of journal bearings“. Thesis, Cranfield University, 1998. http://dspace.lib.cranfield.ac.uk/handle/1826/11357.

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In the theoretical analysis of high speed rotor bearing systems, it is common to use four displacement and four velocity based coefficients, which characterise the behaviour of the lubricating fluid film. Although a great deal of work has been published establishing theoretical models of all types of hydrodynamic journal bearings, the large amount of experimental work has centred on relatively low speed conditions. This work presents a contribution to the experimental study of the static and dynamic characteristics of oil films in journal bearings used in high-speed rotating machinery. The main objectives of the work are: • To devise new experimental techniques for the measurement of dynamic coefficients suitable for use at high rotational speeds • To design, manufacture, assemble and commission a test facility to measure the static and dynamic characteristics of journal bearings at speeds up to 30000 rpm • To determine the static and dynamic characteristics of a 5 Pad Tilting Pad Journal Bearing Unit of 80 mm diameter at speeds up to 25 000 rpm using the said test facility. New techniques are particularly necessary for the measurement of velocity coefficients because these invoke the necessity of imposing a velocity on to the bearing housing and previous techniques have utilised synchronous motion of the bearing. Consequently a new experimental procedure for measuring the four velocity or damping coefficients of an oil film journal bearing from imposed dynamic "orbits" has been devised called the "double pulse" technique. All four velocity coefficients are derived from one imposed journal centre dynamic orbit and, therefore may be regarded as being obtained at the same time. The method requires the production of a "cross- over" point similar to that of a "figure of eight" shaped orbit and utilises the "cross-over" point therein. Coefficients are initially evaluated in a co-ordinate system, which is chosen to align with the designated parts of the measured orbit. Each coefficient is then evaluated from single values of instantaneous imposed force and resulting journal centre velocity. Coefficients are them converted into any other desired axes system. The result is a simpler experimental procedure, with reduced uncertainty compared to hitherto existing methods. The use of non-sinusoidal excitation of the oil film was explored, in the form of applying a step-pulse train load pattern to produce a cross-over pattern in the journal displacement ·orbit'. Experimental tests were completed on a tilting pad bearing at speeds up to 15 000 rpm inclusive. At speeds above this, the bearing exhibited a vibrational response, which precluded the accurate measurement of journal centre displacement.

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Odehnal, Lukáš. „Vývoj součinitele tření a mazacího filmu v implantátu kolenní náhrady v průběhu cyklu chůze“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442825.

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This master´s thesis deals with the experimental analysis of the coefficient of friction and lubrication film in total knee replacement. The experiments are performed on a knee joint simulator, with an implemented module for measuring friction. To observe film formation, fluorescent microscopy is used. The experiments are mainly focused on a detailed description of the influence of parameters occurring during the gait cycle. This approach should significantly help in describing the tribological processes that occur in the total knee replacement. The results confirm previous investigations in terms of axial load, where the coefficient of friction decreases with the increasing load. In the case of lubrication film, no significant changes are observed. On the contrary, while investigating the influence of SRR, noticeable changes in film formation are observed while the coefficient of friction being unaffected. While describing the whole gait cycle, precise results are obtained only in the first half of the cycle as the second half is accompanied by the occurrence of large deviations from a rapid decrease of load. This work provides a better understanding of the field of lubrication film in total knee replacements. Moreover, thanks to the simultaneous measurement of the coefficient of friction and the observation of the contact area, it is possible to draw better conclusions than if the experiments had been carried out separately.

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Wilson, James W. „Development and optimisation of supercritical fluid deposition of semiconductor films“. Thesis, University of Southampton, 2010. https://eprints.soton.ac.uk/167623/.

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This thesis is concerned with the deposition, and characterisation, of semiconductor thin films and microstructures deposited from a supercritical uid. Thin films of CdS, GaP, InP, InAs, and Ge were deposited using supercritical CO2 and CO2-solvent mixtures. Ge was deposited into macropores etched into crystalline silicon substrates. A variety of reactors were designed in order to achieve the successful deposition of the materials. The surface morphology and crystallinity of the films were characterised by scanning electron microscopy and X-ray diffraction. The chemical composition of the films was analysed by energy or wavelength dispersive X-ray spectroscopy, secondary ion mass spectroscopy, Auger electron spectroscopy, and X-ray photoelectron spectroscopy. The optoelectronic quality of the CdS and InP films was analysed by photoluminescence spectroscopy and mapping. The CdS films deposited were confirmed to be of hexagonal phase by X-ray diffraction and exhibited band edge luminescence. The InP and InAs films were determined to be of cubic structure and the InP films were found to exhibit weak band edge luminescence. The fabrication of macroporous silicon templates by photoelectrochemical etching is also discussed. Pores with diameters of between 60 nm and 2 m were fabricated, having aspect ratios of up to 100:1. Ge was successfully deposited into macropores etched into these crystalline silicon templates with near conformal coverage.

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Lo, Yichi, und 羅依琦. „The important problems of conducting fluid dynamics experiments with soap film tunnels（PARTⅠ）The development of Digital Partical Image Velocimetry（PARTⅡ）“. Thesis, 2000. http://ndltd.ncl.edu.tw/handle/58672027630312846855.

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碩士
大葉大學
機械工程研究所
88
This thesis is divided into two parts: Part Ⅰ-“The important problems of conducting fluid dynamics experiments with soap film tunnels”and Part Ⅱ“The development of Digital Partical Image Velocimetry”. The main goal for the first part of the thesis is to investigate two key problems of conducting fluid dynamics experiments with soap film tunnels. These two problems are: (1) How important is the air friction to the soap film flow? (2) What does the interference pattern in the soap film represent? The first problem was answered by two sets of experiments conducted in a horizontal soap film tunnel. The tunnel was placed in a vacuum chamber. The first set of experiments is to observe the shedding frequencies of flows over a circular cylinder, via a laser Doppler anemometer. The second set of experiments is to measure the drag coefficients experienced by a normal flat plate, via a laser Doppler anemometer and the momentum defect method. Both set of experiments were conducted with and without vacuum. The objective is to find the influence of different ambient pressure (air friction) on the soap film flow. The vacuum chamber for the horizontal soap film tunnel has been established. The second subject was to interpret the physical meaning of those color fringes with a theoretical investigation and numerical simulation. It was showed that they resembled streamlines of 2-D flows in steadily flowing soap films. Photographs of flow over a circular cylinder and step were compared with theoretical investigation and numerical simulation. Good agreement is found. The physical meaning of those color fringes is streamlines in steady flow. The main goal for the second part of the thesis is to develop the software of Digital Partical Image Velocimetry. With tests of the numerical simulation and the benchmark test flow, the software of Digital Partical Image Velocimetry yields good results.

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Bücher zum Thema "Fluid film development"

[Cryogenic fluid film bearing tester development study]: [final report, 16 Apr. - 16 Jun. 1993]. [Washington, DC: National Aeronautics and Space Administration, 1993.

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Development, implementation, and assessment of specific closure laws for inverted-annular film-boiling in a two-fluid model. Washington, DC: Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1996.

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U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research und Laboratory for Thermal-Hydraulics (Paul Scherrer Institut), Hrsg. Development, implementation, and assessment of specific closure laws for inverted-annular film-boiling in a two-fluid model. Washington, DC: Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1996.

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Buchteile zum Thema "Fluid film development"

Schülein, E. „Development and Application of the Thin Oil Film Technique for Skin Friction Measurements in the Short-Duration Hypersonic Wind Tunnel“. In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 407–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-39604-8_51.

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El-Shafei, A. „Developments in Fluid Film Bearing Technology“. In IUTAM Symposium on Emerging Trends in Rotor Dynamics, 201–15. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-94-007-0020-8_18.

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Wittig, S., A. Elsäßer, W. Samenfink, J. Ebner und K. Dullenkopf. „Velocity Profiles in Shear-Driven Liquid Films: LDV-Measurements“. In Developments in Laser Techniques and Fluid Mechanics, 509–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60911-4_32.

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Le Coz, Jean-François, und Thierry Baritaud. „Application of Laser Induced Fluorescence for Measuring the Thickness of Evaporating Gasoline Liquid Films“. In Developments in Laser Techniques and Applications to Fluid Mechanics, 115–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-79965-5_8.

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McCann, Ben. „The ‘impure’ auteur“. In Julien Duvivier. Manchester University Press, 2017. http://dx.doi.org/10.7228/manchester/9780719091148.003.0002.

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This opening chapter will contextualise the ‘Duvivier style’. It will look at his chief formative influence, André Antoine, whose influential theories on cinematic naturalism, location shooting, and performance authenticity was cultivated and developed by Duvivier throughout his career. The chapter will examine what makes a Duvivier film. Historians often make reference to Duvivier’s love of ‘work well done’ as his signature legacy and enduring film-making ethos. The chapter will introduce the key recognisable Duvivier traits: an expressive mise en scène, fluid camera movement and a complex negotiation of décor, strong central performances by stars and new actors, pessimistic narratives, incorporation of melodramatic elements (music, production design), and a film-by-film reliability. This analysis of Duvivier, beyond its historical range, also proposes to engage with key debates in film studies: notably auteurism, stardom and audience reception. The chapter will also look at how Duvivier fits into a history of both French national cinema and international film production. Duvivier’s genre eclecticism and lack of a coherent corpus should not be seen as a negative; instead, it is necessary to read Duvivier’s wide-ranging approach to genre and subject matter as a response to and engagement with important development in French and international film praxis.

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Caeners, Torsten. „Negotiating the Human in Ridley Scott’s Prometheus“. In Posthumanism in Young Adult Fiction, 199–226. University Press of Mississippi, 2018. http://dx.doi.org/10.14325/mississippi/9781496816696.003.0010.

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Using psychoanalytic theories, Torsten Caeners places the film Prometheus squarely in the canon of YA literature. The characters Elizabeth and the android David are “ciphers for young adult concerns of coming of age.” The crew of the spaceship Prometheus discovers the Engineers, superhuman aliens who created humans. Elizabeth, obsessed with origins, believes they have found the source of humanity, but because of her refusal to let go of her belief paradigms (represented by her father, God, science, and finally the Engineers) she remains in stasis and even moves backward from transitioning in her development. David, though, is the true adolescent, in-between human and nonhuman, moving on and changing, experiencing transformations—the hallmark of posthumanism—serially. Caeners argues that posthumanism is adolescence, as both are liminal conditions, fluid, boundary-less, marked by the angst of transformation and new possibilities.

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Mazierska, Ewa, Matilda Mroz und Elżbieta Ostrowska. „Shaping the Cinematic Bodies of Eastern Europe and Russia“. In The Cinematic Bodies of Eastern Europe and Russia. Edinburgh University Press, 2016. http://dx.doi.org/10.3366/edinburgh/9781474405140.003.0001.

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This collection offers a series of perspectives on the bodies of Eastern European and Russian cinema, a terrain of growing scholarly interest, but one which remains under-researched, for reasons that are both general and region-specific. Our aim is not to provide a monolithic vision of how the body has been configured across this vast geographical area; it is not possible to formulate a single argument concerning the Eastern European and Russian body. Rather, the chapters put forward a series of ‘openings on the body’, to use Shildrick and Price’s terminology, in the cinemas of the region (1999: 1). The kaleidoscopic vision that emerges from these perspectives is of the body, whether individual, collective, symbolic or specific, as a nexus of often-competing forces, affects and ideologies, and as multiple and fluid. We hope that, by making corporeality our focus, we will yield new insights into the material and screen cultures of the countries under consideration: former Czechoslovakia and the Czech Republic, Hungary, Poland, Russia and former Yugoslavia. With the possible exception of Russia, the cinematic outputs of these countries are marginalised in studies of both ‘European’ and ‘world’ cinema. As Portuges and Hames point out, this is a relatively recent development: between the 1950s and 1970s, these film industries were more widely known and studied; the subsequent decline of interest has meant that ‘a generation of critics and audiences have grown up for whom the cinemas of Eastern Europe are very much unknown territory’ (2013: 3). With our focus on this region, we thus aim to foster a more inclusive vision of material and film culture.

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Wells, Christi Jay. „“Lindy Hopper’s Delight”“. In Between Beats, 61–108. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780197559277.003.0003.

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As jazz music became popular entertainment nationwide, many dances circulated from social venues to professional floor shows and ballroom stages and then back again to amateur social practice. As musicians built careers playing for social dancers touring with professional dance acts, they learned to structure their performances collaboratively by listening visually to dancers’ bodies. Jazz musicians, and especially drummers, learned to accentuate dancers’ movements and engage them in playful “catching” games while also providing the stable rhythmic framework that encouraged dancers to participate kinesthetically with the music. This chapter explicates the dynamics of such relationships through the career of drummer Chick Webb, whose reputation was built on the strength of his close connection with lindy hop dancers during his tenure as house bandleader at Harlem’s Savoy Ballroom throughout the 1930s. Specifically, it explores his close connections with Whitey’s Lindy Hoppers, a group of talented young dancers who became among the first to adapt this social partnered dance for the professional stage and, ultimately, for Hollywood films. Webb played regularly for elite lindy hop dancers in films, in touring stage shows, for amateur dance contests, and nightly at the Savoy, and his evolving relationship with them throughout the 1930s reveals the fluid boundaries between labor and play through which musicians and dancers co-creatively shaped jazz’s development.

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Gurau, Calin. „Business IT Systems Implementation“. In Business Information Systems, 1234–42. IGI Global, 2010. http://dx.doi.org/10.4018/978-1-61520-969-9.ch076.

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The traditional channels of marketing are gradually being transformed by, or assimilated into, the global network represented by the Internet and modern information technology (IT) applications. Unfortunately, in most cases, the current IT systems are not fluid and dynamic enough to cope with ubiquitous customers who can contact the firm through a multitude of communication channels, such as mobile phones, Internet, or fax. The effective implementation of modern marketing strategies depends on the effective use of IT systems and procedures. Internet-based technology can facilitate information dissemination, file transformation, data mining, and processing (Roberts, Raymond, & Hazard, 2005), which creates opportunities for the development and implementation of efficient customer relationship management systems. On the other hand, the new information technologies can also be used to increase the employees’ satisfaction and productivity (Dorgan, 2003; Eichorn, 2004). Thus, the implementation and use of an efficient IT system for business and marketing activities becomes a fundamental task, which should be managed jointly by business specialists and IT professionals (Wierenga & Van Bruggen, 2000). Unfortunately, these opportunities are hindered by many challenges at organisational or managerial levels, such as defining and restructuring the internal and the external sources of information, centralising the marketing database, and integrating the IT and marketing procedures at operational level. Considering all these issues this paper attempts, on the basis of secondary data, to provide an overview of the main issues related with the implementation of IT systems in business organisations and the challenges related with the integration between information technology and marketing systems. After a brief presentation of the previous research on this topic, the paper presents the stages of a gradual integration of IT systems in a business organisation and proposes a theoretical model

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Konferenzberichte zum Thema "Fluid film development"

Edeline, Emmanuel, Patrice Fonteyn, Manuel Frocot, Jérôme Dehouve und Patrice Fayolle. „Development and Testing of a Fluid Film Bearing LH2 Turbopump Demonstrator“. In 40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-3688.

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Hoyne, Alexander C., Chandra Nath und Shiv G. Kapoor. „Characterization of Fluid Film Produced by an Atomization–Based Cutting Fluid (ACF) Spray System During Machining“. In ASME 2013 International Manufacturing Science and Engineering Conference collocated with the 41st North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/msec2013-1187.

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The atomization–based cutting fluid (ACF) spray system has recently been proposed as a cooling and lubrication solution for machining hard to machine materials (e.g. titanium alloys). On the tool rake face, the ACF spray system forms a thin film from cutting fluid that penetrates into the tool–chip interface to improve tool life. The objective of this work is to characterize this thin fluid film in terms of thickness and velocity for sets of ACF spray parameters. ACF spray experiments are performed by varying impingement angle in order to observe the nature of the spreading film, and to determine the film thickness at different locations after impingement of the droplets. It is observed that the film spreads radially outward producing three fluid film development zones (i.e. impingement, steady, unsteady). The steady zone is found to be between 3 and 7 mm from the focus (impingement point) of the ACF spray for the set of parameters investigated. An analytical 3D thin fluid film model for the ACF spray system has also been developed based on the equations for continuity of mass and momentum. The model requires a unique treatment of the cross–film velocity profile, droplet impingement and pressure distributions, as well as a strong gas–liquid shear interaction. The thickness profiles predicted by the analytical film model have been validated. Moreover, the model predictions of film velocity and chip flow characteristics during a titanium turning experiment reveal that the fluid film can easily penetrate into the entire tool–chip interface with the use of the ACF spray system.

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Kabov, Oleg A. „Interfacial Thermal Fluid Phenomena in Thin Liquid Films“. In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22959.

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Films are ubiquitous in nature and play an important role in our daily life. The paper focuses on the recent progress that has been achieved in the interfacial thermal fluid phenomena in thin liquid films and rivulets through conducting experiments and theory. Phase shift schlieren technique, fluorescence method and infrared thermography have been used. A spanwise regular structures formation was discovered for films falling down an inclined plate with a built-in local rectangular heater. If the heating is low enough, a stable 2D flow with a bump at the front edge of the heater is observed. For lager heat flux this primary flow becomes unstable, and the instability leads to another steady 3D flow, which looks like a regular structure with a periodically bent leading bump and an array of longitudinal rolls or rivulets descending from it downstream. The heat flux needed for the onset of instability grows almost linearly with the increase of Re number. Strong surface temperature gradients up to 10–15 K/mm, both in the streamwise and spanwise directions have been measured. For a wavy film it was found that heating may increase the wave amplitude because thermocapillary forces are directed from the valley to the crest of the wave. Thin and very thin (less than 10 μm) liquid films driven by a forced gas/vapor flow (stratified or annular flows), i.e. shear-driven liquid films in a narrow channel are a promising candidate for the thermal management of advanced semiconductor devices in earth and space applications. Development of such technology requires significant advances in fundamental research, since the stability of joint flow of locally heated liquid film and gas is a rather complex problem. Experiments with water and FC-72 in flat channels (height 0.2–2 mm) have been conducted. Maps of flow regimes were plotted. It was found that stratified flow exists and stable in the channels with 0.2 mm height and 40 mm width. The critical heat flux for a shear driven film may be up to 10 times higher than that for a falling liquid film, and reaches 400 W/cm2 in experiments with water at atmospheric pressure. Some experiments have been done during parabolic flight campaigns of the European Space Agency under microgravity conditions. It was found that decreasing of gravity leads to a flow destabilization.

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Choi, Sun Rock, Jonggan Hong und Dongsik Kim. „Development of a Novel Thermal Sensor to Monitor the Fluid State in a Microchannel“. In ASME 2009 7th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2009. http://dx.doi.org/10.1115/icnmm2009-82284.

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This work presents development of a novel thermal sensor to measure the fluid phase and composition in a microchannel. As the sensor employs an AC hot-film technique to monitor the fluid state, it is more sensitive and noise-resistant than the conventionally used DC technique. The sensor is composed of a thin-film heater integrated into a PDMS microchannel fabricated on a glass substrate. Monitoring the liquid-gas phase interface in a microchannel is demonstrated by examining water injection and liquid evaporation processes. The results show good agreement with those by optical inspection. Also, real-time monitoring the composition of ethanol/water mixtures flowing in a microchannel is demonstrated. The presented sensor is expected to be used in various potential applications, including multiphase flow sensors, lab-on-a-chip devices, micro heat exchangers and micro fuel cells.

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Grimes, Ronan, Colin King und Edmond Walsh. „Film Thickness for Two Phase Flow in a Microchannel“. In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15882.

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The issue of contamination of micro channel surfaces by bio fluids is a significant impediment to the development of many biomedical devices. A solution to this problem is the use of a carrier fluid, which segments the bio fluid and forms a thin film between the bio fluid and the channel wall. A number of issues need to be addressed for the successful implementation of such a solution. Amongst these is the prediction of the thickness of the film of carrier fluid which forms between the bio sample and the channel wall. The Bretherton and Taylor laws relate the capillary number to the thickness of this film. This paper investigates the validity of these laws through an extensive experimental program in which a number of potential carrier fluids were used to segment aqueous droplets over a range of flow rates. The aqueous plugs were imaged using a high speed camera and their velocities were measured. Film thicknesses were calculated from the ratio of the velocity of the carrier fluid to the velocity of the aqueous plug. The paper concludes that significant discrepancies exist between measured film thicknesses and those predicted by the Bretherton and Taylor laws.

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Kang, Kyungho, und Pranav Shrotriya. „Surface Stress Development Associated With Hybridization of Monomolecular DNA Film“. In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12011.

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Surface stress changes associated with hybridization of surface immobilized DNA molecules are measured. A novel interferometry technique employing two adjacent micromachined cantilevers a sensing/reference pair is used to measure the surface stress development. Measurement approach relies on coating the sensing cantilever with single stranded DNA (30-mer Adenine (poly A)) and reference cantilever with hybridized DNA. The sensing/reference pair is exposed to varying concentrations of complimentary DNA strand (30-mer Thymine (Poly T)) and differential deflection of sensing cantilever with respect to reference is measured to determine the change in surface stress. Experimental results indicate that surface stress develops only on exposure to complimentary strands (specific binding) and is not affected by exposure to other single stranded DNA (non-specific binding). Varying the poly T concentration from 0.1 to 1.0 μM results in a linear increase of the surface stress changes from 40 to 110 mN/m during DNA hybridization. Surface stress development starts as soon as the complementary poly T is introduced in the fluid cell and reaches a stable value within 15 minutes of injection time.

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Nagata, Tetsushi, Masaki Fuchiwaki und Kazuhiro Tanaka. „Vortex Structure Rolled Up From Elastic Thin Film by Fluid Structure Interaction Simulation“. In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-08021.

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The flow field around a moving body is treated as a fluid-structure interaction (FSI), which is a series of phenomena from the elastic deformation of a body to vortex generation/growing/development. In the present paper, we simulate the fluid structure interaction of a flow field around an elastic heaving thin film with large deformation using ANSYS 12.1/ANSYS-CFX 12.1, and clarify the elastic deformation, velocity, acceleration, vortex roll-up from the trailing edge, circulation, and dynamic lift, as well as other important parameters to obtain the vorticities, circulations and dynamic lifts. The elastic deformation, velocity and acceleration can produce the large vorticity and the circulation. In particular, the vorticity that rolled up from the trailing edge of the thin film is dependent on the elastic velocity, and the vorticity production at the trailing edge is dependent on the elastic acceleration. Moreover, the vortex production is also distributed to the circulation production and the dynamic lift. Therefore, the elastic deformation, velocity and acceleration can produce and change the flow field for the vorticity, circulation, and dynamic force.

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Mavraki, A., und P. M. Cann. „Lubricating Film Thickness Measurements on Bovine Serum“. In STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71037.

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In this paper lubricant film thickness for bovine serum (BS) was measured in a ball-on-disc optical device under steady-state rolling and sliding. Tests were carried out for a range of BS concentrations and substrate materials (M52100 steel and chromium coatings) in both low (MPa) and high-pressure (GPa) configurations. The results show that BS forms films 2–50 nm thick over the speed range although this depends on the contact pressure. However there was significant scatter in these results, possibly due to the inherent nature of the fluid, which is an inhomogeneous biological sample. Clearly this will contribute to scatter in wear results. In some cases thick (up to 100nm) films were formed at low speeds under both sliding and rolling conditions, this behaviour was considered representative of high-viscosity surface layers rather than solid films. However residual films of 13–17nm were also measured under static loading. These are attributed to the adsorption of protein molecules and will provide surface protection during stance or on initiation of gait. A small number of results at under low pressure sliding conditions indicated that much thicker films were formed than at high pressures. One interesting aspect of the results is that they are not representative of a simple Newtonian fluid and thus have considerable implications for the development of predictive film thickness models.

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Bohn, Dieter E., und Norbert Moritz. „Comparison of Cooling Film Development Calculations for Transpiration Cooled Flat Plates With Different Turbulence Models“. In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0132.

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A transpiration cooled flat plate configuration is investigated numerically by application of a 3-D conjugate fluid flow and heat transfer solver, CHT-Flow. The geometrical setup and the fluid flow conditions are derived from modern gas turbine combustion chambers. The plate is composed of three layers, a substrate layer (CMSX-4) with a thickness of 2 mm, a bondcoat (MCrAlY) with thickness 0,15 mm, and a thermal barrier coating (EB-PVD, Yttrium stabilized ZrO2) with thickness 0,25 mm, respectively. The numerical grid contains the coolant supply (plenum), the solid body, and the main flow area upon the plate. The transpiration cooling is realized by finest drilled holes with a diameter of 0,2 mm that are shaped in the region of the thermal barrier coating. The holes are inclined with an angle of 30°. Two different configurations are investigated that differ in the shaping of the holes in their outlet region. The numerical investigation focus on the influence of different turbulence models on the results. Regarding the secondary flow, the cooling film development and complex jet mixing vortex systems are analyzed. Additionally, the impact on the temperature distribution both on the plate surface and in the plate is investigated. It is shown that the choice of the turbulence model has a significant influence on the prediction of the flow structure, and, consequently, on the calculation of the thermal load of the solid body.

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Bonneau, Olivier, Victor Lucas und Jean Frene. „Influence of Geometric Parameters on Annular Fluid Seal Characteristics“. In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0511.

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Abstract The numerical prediction of the dynamical behavior of turbopumps is very important. The space technology and the field of energy products are in constant development and it is necessary to quantify the influence of each component. The dynamical characteristics of annular seals must be calculated with accuracy. The aim of this work is to quantify the influence of geometric parameters on the dynamical behavior of the shaft. Three parameters will be studied: the duct loss parameter (at the seal entrance), a conical seal, and a misaligned seal. The two last geometrical defects have a direct influence on the film thickness. It is important to insist on the influence of the entrance duct loss which governs, in large part, the stiffness calculus (and then the stability). The most difficult problem is to evaluate this duct loss which depends on the seal geometry, Reynolds number and fluid characteristics... This study shows the important rôle played by geometrical parameter of a seal. The conicity and the misalignment modify the dynamical behavior of the shaft. These effects are essentially due to the axial flow which generates a pressure field due to axial film geometry. It should be noted that in the case of predominant circumferential flow these conclusions are totally different.

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Berichte der Organisationen zum Thema "Fluid film development"

Cachard, F. de. Development, implementation and assessment of specific, two-fluid closure laws for inverted-annular film-boiling. Office of Scientific and Technical Information (OSTI), September 1995. http://dx.doi.org/10.2172/106990.

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Lee, Seong-Young, Jeffrey Naber, Mehdi Raessi, Roberto Torelli, Riccardo Scarcelli und Sibendu Som. Evaporation Submodel Development for Volume of Fluid (eVOF) Method Applicable to Spray-Wall Interaction Including Film Characteristics with Validation at High Pressure and Temperature Conditions. Office of Scientific and Technical Information (OSTI), März 2020. http://dx.doi.org/10.2172/1608768.

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