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Thematische Bibliographien / Pump parameters

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Auswahl der wissenschaftlichen Literatur zum Thema „Pump parameters“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 6. Februar 2022

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Zeitschriftenartikel zum Thema "Pump parameters"

1

Othman, N., N. S. Mohd Shah, K. G. Tay, N. A. Cholan und R. Talib. „The effect of pump parameters on dual-pump fiber optical parametric amplifier“. MATEC Web of Conferences 150 (2018): 01010. http://dx.doi.org/10.1051/matecconf/201815001010.

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The impact of pump parameters on dual-pump (2-P) fiber optical parametric amplifier (FOPA) is investigated. The four-wave model of coupled amplitude equations with fiber losses and pump depletion are solved numerically for the calculation of the parametric gain. Simulation results indicate that an increase in pump powers does not only enhances the parametric gain but also flattening the amplification bandwidth. Moreover, separating the pumps wavelengths further from each other can also improve the flatness of the bandwidth. Besides that, the parametric gain flatness can be improved when the separation between the pump central wavelength and zero-dispersion wavelength is small. In essence, the optimal performance of 2-P FOPA can be achieved when the pump parameters are carefully tailored.

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2

Demikhov, K. E., und A. A. Ochkov. „On the Method of Calculating Diffusion Vacuum Pump Stage Pumping Parameters“. Herald of the Bauman Moscow State Technical University. Series Mechanical Engineering, Nr. 2 (137) (Juni 2021): 85–93. http://dx.doi.org/10.18698/0236-3941-2021-2-85-93.

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At present, steam jet vacuum pumps are widely used in various fields of science and technology due to a number of advantages, e.g., reliability, relative simplicity of design, and manufacturability, over other pumping means. The paper analyzes the existing mathematical models of working processes, methods for calculating the pumping parameters of steam-jet vacuum pumps. The problem of improving these methods, which are used in the design, is still urgent. The study attempts to further develop the models in order to increase their practical significance for the pumps design: in particular, the processes of pumping by the first stages of a diffusion pump are considered, since it is they that determine the efficiency of the pump as a whole. Analytical dependences for calculating the main pumping parameters of widely used diffusion vacuum pumps are presented. The obtained equations are a certain clarifying correction of the known provisions on this topic. Findings of research are of practical importance for the design of modern steam-jet vacuum pumps

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3

Zhang, Bowen, Li Cheng, Chunlei Xu und Mo Wang. „The Influence of Geometric Parameters of Pump Installation on the Hydraulic Performance of a Prefabricated Pumping Station“. Energies 14, Nr. 4 (16.02.2021): 1039. http://dx.doi.org/10.3390/en14041039.

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A prefabricated pumping station is a new type of pumping station that plays an important role in the construction of sponge cities in developing countries. It solves the problem of urban water-logging and makes great contributions to the sustainable development of water resources. In order to research the influence of different installation positions of pumps on the internal hydraulic performance of a prefabricated pumping station, based on ANSYS software, the computational fluid dynamics (CFD) numerical simulation method was used to analyze the internal flow state of the prefabricated pump station. In this research, the optimal geometric parameters of pump installation in a prefabricated pumping station are given. The results show that when the distance between the connecting line of two pumps and the center of the sump is L = 0.2 R, the distance between the two pumps is S = 0.6 R, and the suspension height of the two pumps is H = 0.6 D, the internal flow pattern of the prefabricated pump station is better. (R is the cross-sectional radius of the sump and D is the diameter of the nozzle of the pump horn.) These research results have certain guiding significance for improvement of the hydraulic performance and operation efficiency of prefabricated pump stations. They also provide a theoretical basis for parameter selection for prefabricated pumping stations.

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Dubei, O. Ya. „The Influence of the Jet Pump Geometry on its Main Technological Parameters“. Prospecting and Development of Oil and Gas Fields, Nr. 4(73) (30.12.2019): 24–34. http://dx.doi.org/10.31471/1993-9973-2019-4(73)-24-34.

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In order to test the operational efficiency of jet pumps which are installed at different depths in artificial lift-ed oil wells, it is necessary to establish the relation between their geometry and the maximum achievable operat-ing parameters. For this purpose, a series of experimental laboratory studies is conducted. Their main task is to identify the optimal parameters of a jet pump that works with gas-liquid flows. In the experimental setup, the fluid is supplied by an electric centrifugal pump and the air is injected by a compressor. The setup provides the possibility to regulate the fluid pressure before and after the jet pump, as well as the pressure and gas supply at its inlet. The basic parameters of the setup are calculated according to the criteria of the resemblance to real wells. The influ-ence of the jet pump geometry on its working parameters is estimated by replacing its main elements (nozzle, mix-ing chamber, diffuser). For each of the suggested designs of the jet pump, the pressure and the flow rates in its main cross-sections are measured and their measurement values are compared. On the basis of this comparison the author finds the main regularities for choosing optimal geometry which provides maximum gas offtaking or minimum pressure losses. The basic results of the experimental study are presented in the form of graphical dependencies which allow to make conclusions about the operational efficiency of jet pumps.

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Pourtaghi, Adel, und Heidar Pouladi. „Numerical Investigation of The Effect of The Number of Blades of The Impeller On The Performance of Centrifugal Pumps“. Mapta Journal of Mechanical and Industrial Engineering (MJMIE) 2, Nr. 1 (20.04.2018): 1–7. http://dx.doi.org/10.33544/mjmie.v2i1.41.

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A centrifugal pump is a pump which uses a rotating impeller for increasing the pressure of a fluid. Fluid flows to pump from the impellers hole and get accelerated by it and flows toward the volute fast from where enters to the outlet of the pump. Having enough knowledge in the field of geometrical parameters has a great effect on improving the designing and making this kind of pumps. The present study intends to take a small step in this field by evaluation of the effect of mentioned parameters and simulation of fluid current in inside the pumps. For reaching to this goal different number of blades in modelled in impellers and the performance of pump in simulated in Ansys CFX software and finally the results of CFD studies are presented as charts and curves.

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Kryzhanivskyy, Ye I., und D. O. Panevnyk. „Optimization of design and mode parameters of the well ejection system“. Oil and Gas Power Engineering, Nr. 1(33) (03.09.2020): 73–80. http://dx.doi.org/10.31471/1993-9868-2020-1(33)-73-80.

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Insufficient energy performance of ejection equipment and a high probability of non-operating modes of its operation reduce the efficiency of downhole jet pumps. The method of determining the design and operating parameters of the well ejection system, which provide the maximum efficiency of the jet pump, is presented. The proposed algorithm for determining the optimal values of the geometric dimensions of the flowing part of the jet pump involves the construction of a series of pressure characteristics for different values of its geometric parameter, the calculation of the efficiency and the determination of the injection ratio and the relative pressure corresponding to its maximum values. During the studies, the main geometric parameter of the jet pump varied in the range from 2 to 6, given that these geometric dimensions are used in jet devices common in the oil industry. The optimal dimensions of the current part of the jet pump are obtained in the process of studying its pressure characteristics, and the optimal dimensions of the washing system of the bit - in the process of studying the characteristics of the hydraulic system. The design of an at-bit ejection system, which allows to increase the mechanical drilling speed, the passage of the bit, to stabilize the moment on the bit, to reduce its level of vibration and to control the antiaircraft angles of the well is considered. The efficiency of using at-bit jet pumps is in the following: an increase in the mechanical drilling speed up to 18.7%, the passage of the bit up to 50.8%. The research established the optimal diameters of the working nozzle, mixing chamber and bit nozzles, the distance between the working nozzle and the mixing chamber, the injection ratio and the relative pressure of the at-bit jet pump. The obtained values of design and mode parameters exclude the occurrence of cavitation modes of operation of the ejection system and allow the operation of jet pumps with maximum efficiency.

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Parolari, P., L. Marazzi, E. Rognoni und M. Martinelli. „Influence of pump parameters on two-pump optical parametric amplification“. Journal of Lightwave Technology 23, Nr. 8 (August 2005): 2524–30. http://dx.doi.org/10.1109/jlt.2005.850018.

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Bazhaykin, Stanislav G., Eugeny F. Denisov, Marat Z. Yamilev und Egor А. Tigulev. „Development of bench for investigation of hydraulic characteristics of flow part of shaftless combined pump-electric motor“. SCIENCE & TECHNOLOGIES OIL AND OIL PRODUCTS PIPELINE TRANSPORTATION 10, Nr. 5 (31.10.2020): 550–57. http://dx.doi.org/10.28999/2541-9595-2020-10-5-550-557.

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The stages of creating a brand new shaftless pump unit are considered; including its flow part efficiency tests. The development is aimed at reducing losses caused by design features of existing pumps. A reliable and relatively inexpensive way to choose the optimal design of a pump unit is to perform large scale models tests. The key criterion of the test bench efficiency is the precise determination of the monitored parameters and their characteristics. The authors analyzed the structure of centrifugal pump losses and identified ways to improve the efficiency of pumping units. Principles of testing new pumps were formulated. The main components of the testing equipment are given. The main parameters that allow estimating the efficiency of the hydraulic part of a designed shaftless pump are defined, on the basis of which bench technical solutions are developed. A delivery component sketch is proposed, a flow diagram of a test bench is developed, and the criteria of measured parameters are defined.

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Bogdevičius, Paulius, Olegas Prentkovskis und Marijonas Bogdevičius. „Transmission with Cardan Joint Parametre Influence to Centrifugal Pump Characteristics“. Mokslas - Lietuvos ateitis 9, Nr. 5 (27.12.2017): 559–64. http://dx.doi.org/10.3846/mla.2017.1073.

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Transmission with cardan joints and nonlinear gearbox elements generates vibrations caused by spinning motion of transmission. This affects the pressure and productivity of centrifugal pump. The momentum of centrifugal pump in turn affects dynamic characteristics of transmission. In order to find the effect of transmission elements on centrifugal pump we investigate transmission composed of asynchronous electrical engine, gear box, cardan joint and Ziegler Ultra centrifugal pump. We create mathematical models of transmission and centrifugal pumps and investigate how the dynamic effects of transmission influence productivity centrifugal pump. This model can be applied to study the transmission parameters, effect of intake and outflow parameters on productivity of centrifugal pump and presence of cavitation. The paper includes results and conclusions of mathematical model.

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Mimmi, G., und P. Pennacchi. „INTERNAL LOBE PUMP DESIGN“. Transactions of the Canadian Society for Mechanical Engineering 21, Nr. 2 (Juni 1997): 109–21. http://dx.doi.org/10.1139/tcsme-1997-0008.

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The subject of this paper is the theoretical analysis of the internal lobe pump which is a particular type of positive displacement rotary pump. The main components of the pump are the rotors: usually the outer one is characterised by lobes with circular shape, while the inner rotor profile is determined as conjugate to the other. For this reason the first topic presented here is the definition of the geometry of the rotors starting from the design parameters. The choice of these parameters is subject to some limitations in order to avoid inner rotor undercutting and to limit the pressure angle between the rotors. Now we will consider the design optimisation. The first step is the determination of the instantaneous flow rate as a function of the design parameters. This allows us to calculate two performance indexes commonly used for the study of positive displacement pumps: the flow rate irregularity and the specific flow rate. These indexes are used to optimise the design of the pump and to obtain the sets of optimum design parameters. Finally further considerations are presented regarding the calculation and the use of other performance indexes, the specific slipping and the rotor curvature, which are particularly suitable for giving more elements for the analysis of this case.

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Dissertationen zum Thema "Pump parameters"

1

Khare, Aditi. „Estimation and control of the pump pressure rise and flow from intrinsic parameters for a magnetically-levitated axial blood pump /“. Online version of thesis, 2008. http://hdl.handle.net/1850/7988.

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2

Podešva, Adam. „Použití běžného odstředivého čerpadla jako turbíny“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444636.

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This work deals with the use of a centrifugal pump in turbine mode and control of the system where this machine is operated. The introduction describes and divides the various types of pumps and discusses the issue of Euler's pump and turbine equations. The flow control options are also described here. Part of the work is a research that examines the advantages and disadvantages of using a centrifugal pump in turbine mode, the possibilities of using this system and real applications in the Czech Republic and in the world. The main part is the design of a mathematical model in Microsoft Excel, which solves the regulation of the piping system with a pump operating in turbine mode, especially out of the optimal operating parameters.

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Rahman, Mashuqur. „Rheology of cement grout : Ultrasound based in-line measurement technique and grouting design parameters“. Doctoral thesis, KTH, Jord- och bergmekanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176885.

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Grouting is performed in order to decrease the permeability and increase the stiffness of the material, especially soil and rock. For tunnelling and underground constructions, permeation grouting is done where cement based materials are pumped inside drilled boreholes under a constant pressure, higher than the ground water pressure. The aim of permeation grouting is to reduce the water flow into tunnels and caverns and to limit the lowering of the surrounding groundwater table. Cement based materials are commonly used as grout due to their availability and lower costs. To obtain a proper water sealing and reduce the lowering of the ground water table, a desired spread of grout must be achieved and the rheology of the cement grout is the governing factor for estimating the required spread. Rheological properties of cement grout such as viscosity and yield stress are commonly measured off-line using laboratory instruments, and some simple tools are available to make field measurements. Although the rheological properties of the grout that is used play a fundamental role in design and execution, no method has yet been developed to measure these properties in-line in field work. In addition to the real time measurement, there is no standard method for determining the yield stress for grouting applications. Despite the common usage of Bingham model fitting to determine the yield stress, the range of shear rate is often not specified or is neglected. In this work, an in-line rheometry method combining the Ultrasound Velocity Profiling (UVP) technique with Pressure Difference (PD) measurements, known as “UVP+PD”, was successfully tested for continuous in-line measurements of concentrated micro cement based grouts. A major obstacle of using the ultrasound based methodology was the transducers, which would be capable of emitting sufficient acoustic energy and can be used in field conditions. The transducer technology was developed in a parallel project and the Flow-Viz industrial rheometer was found to be capable of detail measurement of the velocity profiles of cement grout. The shape of the velocity profiles was visualized, and the change in the shape of the profiles with concentration and time was observed. The viscosity and yield stress of the grout were determined using rheological models, e.g. Bingham and Herschel-Bulkley. In addition, rheological properties were determined using the non-model approach (gradient method) and the tube viscometry concept and were compared with results obtained using the rheological models. The UVP+PD method was found to be capable of determining the rheological behavior of cement grout regardless of the rheological model. The yield stress of cement grout was investigated using off-line rheometry techniques and UVP+PD in-line measurements. Tests were performed applying different shear histories and it was found that two ranges of yield stress indeed exist. Therefore, the design value of yield stress should be chosen with respect to the prevailing shear rate at the grout front for the required spread of grout. In addition, an appropriate shear rate range should be used when a Bingham fitting is done to determine the yield stress. In order to estimate the shear rate, plug thickness and velocity for one dimensional and two dimensional geometry, a non- dimensional nomogram was developed. The advantage of using the nomogram is that it does not depend on the applied pressure and the rheological properties of the grout and can therefore, be used as a simple design tool. Analytical approaches were used for the estimation and good agreements were found with numerical calculations and experimental results. In conclusion, in this work, it was found that it is possible to continuously measure the velocity profiles and determine the change of the rheological properties of cement grout using the ultrasound based UVP+PD method under field conditions. The yield stress was also investigated and it was found that two range of yield stress exist depending on the prevailing shear rate of the grout, which should be used for designing the grouting time at different conditions. In order to decide the design value of yield stress for grouting applications, a non-dimensional nomogram was developed that can be used to estimate the plug thickness, shear rate and velocity of the grout.

Funding for the project was provided by the Swedish Rock Engineering Research Foundation (BeFo), The Swedish Research Council (FORMAS) and The Development Fund of the Swedish Construction Industry (SBUF), who are gratefully acknowledged. QC 20151112

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Pellegri, Matteo, Andrea Vacca, Ram S. Devendran, Etienne Dautry und Benjamin Ginsberg. „A Lumped Parameter Approach for GEROTOR Pumps: Model Formulation and Experimental Validation“. Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199845.

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This paper describes a high fidelity simulation model for GEROTOR pumps. The simulation approach is based on the coupling of different models: a geometric model used to evaluate the instantaneous volumes and flow areas inside the unit, a lumped parameter fluid dynamic model for the evaluation of the displacing action inside the unit and mechanical models for the evaluation of the internal micro-motions of the rotors axes. This paper particularly details the geometrical approach, which takes into account the actual geometry of the rotors, given as input as CAD files. This model can take into account the actual location of the points of contact between the rotors as well for the actual clearances between the rotors. The potentials of the model are shown by considering a particular GEROTOR design. A specific test set-up was developed within this research for the model validation, and comparisons in terms of steady-state pressure versus flow curves and instantaneous pressure ripples are shown for the reference pump.

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Dandachi, Jaber M. A. „Steam air ejector performance and its dimensional parameters“. Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/7041.

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This thesis reports a two part investigation of single- and two-stage ejector systems in which the primary fluid is steam and the secondary fluid is air. The first part is an experimental investigation. The vacuum created by the ejector is strongly affected by the distance between the steam nozzle outlet and the diffuser throat section. The relation between this distance, which is called in this thesis "the nozzle optimum distance (Lop)", and the geometrical and operating parameters of the nozzle and the diffuser were investigated and forms the object of this part of the thesis. The second part is a theoretical approach. The exit Mach number for the nozzle was found by using the one-dimensional gas dynamic equations together with the first law of thermodynamics. Also a two-dimensional approach using the Method of Characteristics was used to find the exit Mach number and the characteristic net of the flow from the throat to the outlet of the nozzle. Two computer programmes were written on the basis of these two different theoretical techniques and the comparison between the results for the exit Mach number found to be 95% in agreement over the pressure range of the experimental work. A computer programme was also written using the Method of Characteristics to find the shape i.e. the characteristic net and the constant density lines within the flow of the steam jet leaving the nozzle and entering the diffuser. It is believed that the jet diameter at the point where it meets the diffuser wall, which is called in this work "the optimum jet diameter (Dop)", is strongly related to the nozzle optimum distance (Lop). When the characteristic net for the jet is drawn, its point of interception with the diffuser wall can be found and then (Dop) can be measured. This diameter (Dop) was then related to the ejector dimensional parameters and the ejector operating conditions; an equation was found to predict the optimum jet diameter from this equation (Dop)e. Then the predicted optimum nozzles distance (Lop)e was determined by using this computer program where the characteristic net meets the diffuser wall at the calculated optimum jet diameter (Dop)e. Finally, the experimentally determined value of the nozzle optimum distance (Lop) was compared to the theoretically predicted value, and the average error was found to be 1.23%.

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Stareček, Jakub. „Návrh axiálního čerpadla pro zadané parametry“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232102.

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This master's thesis contains basic hydraulic calculations, design and optimalization of both the rotor and stator part of the axial pump. There is also included an analysis of the principle and function of hydrodynamic axial pumps. The last part of this work is focusing on the strength calculations and flow simulations using CFD.

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Mkadara, Geneviève, und Jean-Charles Maré. „Development of a lumped parameter model of an aerospace pump for condition monitoring purposes“. Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71205.

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This paper presents the development of a helicopter axial piston pump model with condition monitoring in mind. Industrial constraints and needs ask for modelling with a lumped-parameter approach and require model architecture to be addressed with care. The aim of the proposed model is to assess the merits of pump leakage monitoring through measurement of case pressure. Once reviewed the state of the art in pump modelling, the slipper/swashplate interface is taken as an example to propose and implement in Simcenter AMESim a variable gap height model. The simulation results show that commonly used lumped-parameter models overestimate leakage. It also points out that average leakage at slipper may reverse at high pump displacement.

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Jokinen, H. (Hanna). „Screening and cleaning of pulp—a study to the parameters affecting separation“. Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514284526.

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Abstract The objective of this thesis was to determine the effects of design, operational and furnish quality parameters on pressure screen and hydrocyclone performance. The general contradictory interrelationships between capacity and selectivity in pressure screening and cleaning are commonly recognized, but deep understanding of the effects of design, operational and furnish quality parameters on the state of operation is missing. As separation selectivity is closely dependent on thickening and pulp passage, an operation curve for separation was applied and its application further developed to examine the parameters affecting pressure screen and hydrocyclone separation. New information was found on the geometry of the screen plate, furnish quality parameters in pressure screen fibre fractionation, and the hydrocyclone separation of fibres, sand and gases. The capacity increases achieved by changes in the wire screen plate geometry were found to be achieved at the cost of separation selectivity in probability screening. The capacity of the screen plate was affected by the flow on the screen plate and through it. The hydraulic resistance both in the forward and reverse flow directions was found to be of great importance for the capacity of the screen plate. Previously unreported knowledge was found regarding the effects of wire width, height and shape. Pressure screening capacity was found to decrease with increasing fibre length, fibre network strength and flocculation. Pressure screen fibre fractionation selectivity was increased by broadening of the fibre length distribution of the feed furnish. The furnish properties also affected the separation selectivity of fibres, sand and gases in the hydrocyclone. An increase in fibre network strength reduced the separation selectivity of the hydrocyclone separation of fibres and sand. Any increase in the specific surface area, and especially in the amount of fines, was found to make gas removal more challenging. It was concluded that a broader range of the specific surface distribution can increase the selectivity of fibre fractionation in the hydrocyclone. Knowledge of the general effects of design, operational and furnish quality parameters on the performance of pressure screen and hydrocyclone separation was deepened as a result of this work, which provides a framework for studying these effects further in pursuit of the general objective of maximizing capacity and selectivity while minimizing energy and investment costs.

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Moravec, Prokop. „Návrh oběžného kola odstředivého čerpadla pro dané parametry“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231500.

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This thesis deals with centrifugal pump impeller design for given parameters. This pump impeller design consists of the calculation of basic dimensions, the meridional flow channel design and blade design. Complete design of the pump impeller is afterwards simulated in CFD programme.

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Vrbka, Tomáš. „Návrh dvoustupňového čerpadla s protiběžnými koly na zadané parametry“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378486.

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This diploma thesis deals with hydraulic design and optimization of the blades of the axial pump. Main objective of the thesis is to design two stage pump with counter-rotating rotors meeting conditions of design point. In addition to the design solution the thesis includes theoretical part which deals with dividing and function description of hydrodynamic pumps.

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Bücher zum Thema "Pump parameters"

1

Aban, M. M. Design parameters affecting the performance of the IRRI-designed axial-flow pump. Manila: International Rice Research Institute, 1985.

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2

Kasenow, Michael. Selected analytical methods using computer programs to estimate aquifer parameters from pump test data. Dubuque, Iowa: W.C. Brown Publishers, 1993.

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3

Borovskiĭ, B. I. Ėnergeticheskie parametry i kharakteristiki vysokooborotnykh lopastnykh nasosov. Moskva: Mashinostroenie, 1989.

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Bousquet, Terry. Quality assurance and quality control materials applicable to the April 1998 revised effluent guidelines BAT parameters. Research Triangle Park, N.C: NCASI, 2001.

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Pirani, Tasneem, und Tony Rahman. Diagnosis and management of upper gastrointestinal haemorrhage in the critically ill. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199600830.003.0177.

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Upper gastrointestinal haemorrhage is a medical emergency that may present with haematemesis and/or melena. An exhaustive history and careful examination aids in identifying the cause of bleeding and directing appropriate management. Validated scoring systems exist to guide the urgency of endoscopic therapy, although these should not be used in isolation, but in conjunction with complete patient assessment. The initial priority should be to resuscitate and stabilize the patient using the airway, breathing, circulation, and disability framework. Resuscitation should be guided by clinical and physiological parameters. Patients should be managed in an environment where vital signs such as heart rate, blood pressure, respiratory rate, conscious level, and urine output are monitored at least hourly. Attempts should be made to correct coagulopathy. Specialist advice should be sought from haematologists for guidance on the most appropriate use of packed red cells and blood products. Over-transfusion should be avoided. Initiation of pre-endoscopy proton pump inhibitor therapy, in particular to avoid definitive endoscopic therapy, is not recommended. Diagnostic endoscopy and therapy should be conducted within 24 hours of presentation. Numerous endoscopic therapies exist—when epinephrine is used for local tamponade and vasoconstriction, application of dual modality treatment is recommended. In cases where endoscopic therapy fails or is not possible, radiological diagnosis, and embolization may become necessary. Occasionally, surgery is required for definitive treatment—close liaison with surgeons is therefore necessary, especially where initial endoscopy is considered suboptimal or re-bleeding occurs.

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M. Korczyński, S. Opaliński, Ewa Popiela-Pleban, Dorota Jamroz, R. Kołacz, Fabiola Bubel, Anna Stochmal und A. Grzelak. Influence of pulp from Kalanchoe daigremontiana on performance, egg quality and selected blood parameters of laying hens. Verlag Eugen Ulmer, 2014. http://dx.doi.org/10.1399/eps.2014.71.

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Haskoning Koninklijk Ingenieurs- en Architectenbureau (Nijmegen, Netherlands) und Commission of the European Communities. Directorate-General Environment, Nuclear Safety and Civil Protection., Hrsg. Technical & economic study on the reduction, based on best available technology, of industrial emissions (water, air & solid wastes) from the pulp industry: Selection of most suitable parameters to determine limit values for emissions to air and water. Luxembourg: Office for Official Publications of the European Communities, 1994.

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Buchteile zum Thema "Pump parameters"

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Zilmer, M., A. Kengsepp, K. Zilmer, C. Kairane und T. Talpsep. „Tumor development and changes in Na+/K+-pump parameters“. In The Sodium Pump, 888–90. Heidelberg: Steinkopff, 1994. http://dx.doi.org/10.1007/978-3-642-72511-1_166.

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McKee, Kristoffer K., Gareth Forbes, Ilyas Mazhar, Rodney Entwistle, Melinda Hodkiewicz und Ian Howard. „A Single Cavitation Indicator Based on Statistical Parameters for a Centrifugal Pump“. In Lecture Notes in Mechanical Engineering, 473–81. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06966-1_42.

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Yao, Bin. „CFD Correlation Between Clearance Leakage and Key Parameters of Oil Well Pump“. In Advances in Decision Science and Management, 633–40. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2502-2_66.

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4

Nakai, Hirotaka, Nobuhiro Kimura, Tomiyoshi Haruyama, Masahide Murakami und Akira Yamamoto. „Effect of Macroscopic Parameters of Porous Material on Flow Characteristics for Superfluid Helium Thermomechanical Pump“. In Advances in Cryogenic Engineering, 1805–11. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2522-6_220.

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5

Wu, Zhiying, Yi Zhang, Zuoyuan Shen, Jinhua Guan, Lihuizhang, Shufang Li, Xuefei Liu und Renzhi Zhang. „Optimal Parameters for Multi-pump Control System of Water Supply Based on Blind Source Separation“. In Lecture Notes in Electrical Engineering, 55–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-26001-8_8.

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Petrovic, R., M. Andjelkovic, M. Radosavljevic und N. Todic. „Experimental Research and Optimization of Characteristic Parameters of the Valve Plate of the Axial Piston Pump/Motor“. In The Latest Methods of Construction Design, 173–83. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-22762-7_27.

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7

Tutunina, Evgenia, Alexey Vaselyev, Sergey Korovkin und Sergey Senkevich. „Optimization of Parameters and Operation Modes of the Heat Pump in the Environment of the Low-Temperature Energy Source“. In Intelligent Computing & Optimization, 497–504. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-00979-3_52.

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Tarasevych, Yuliia, Nataliia Sovenko und Ievgen Savchenko. „Influence of the Stochastic Nature Parameters of Throttle Channels on Characteristic of Automatic Balancing Device of the Centrifugal Pump“. In Lecture Notes in Mechanical Engineering, 374–81. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93587-4_39.

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Korobko, Bogdan, Inna Khomenko, Mykola Shapoval und Viktor Virchenko. „Solution Pressure Pulsations into the Pipeline Size Determination in Dependence on Constructive Parameters of Valve Units of Mortar Pump“. In Lecture Notes in Civil Engineering, 225–43. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-85043-2_22.

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Korobko, Bogdan, Anton Kivshyk und Dmytro Kulagin. „Experimental Study of the Efficiency of the Differential Pump of Electromagnetic Action on the Basis of Mathematical Modeling of the Parameters of Its Operation“. In Lecture Notes in Civil Engineering, 203–13. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-85043-2_20.

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Konferenzberichte zum Thema "Pump parameters"

1

Siddiqi, Mohammed A., Praneetha Boppa und Mikhail P. Strongin. „Multi-Parameters Pump Impeller Optimization“. In ASME 2012 Fluids Engineering Division Summer Meeting collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fedsm2012-72091.

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Rotodynamic pumps designed by traditional methods have persisted at their current levels of maturity, vis-à-vis performance and efficiency, for decades now. These historical statistics of performance have been formulated as industry standard charts of efficiency based on specific speed and flow-rate (Fig. 1). Through the last decade, research activity aimed at challenging and surpassing these historical performance levels, via the application of various optimization methods and tools, has been slowly but surely building up. The work presented in this paper is one such effort to enhance the performance of a pump, with the impeller blade of a medium specific speed centrifugal pump chosen as its subject, the blade being the heart of any turbo-machine. This study is somewhat unique in the respect that intuitive, high-level features were used to optimize the blade design rather than inanimate variables. A radical and proprietary blade development scheme allowed a 75% reduction in the number of parameters needed to fully describe the blade, compared to conventional blade layout and development schemes. A software suite comprised of an intimate blend of proprietary and commercial tools, for design, performance simulation and optimization, constituted the engine for this study. A template was generated with all software linked in a seamless bi-directional communication loop for hands-off execution of the optimization study (Fig. 3). A Design of Experiments (DoE) scheme is used to generate several hundred design points corresponding to different geometry and flow configurations. Computational Fluid Dynamics (CFD) software was used to simulate the performance and yield integrated output parameters, viz., head, power, and efficiency, for each design point at multiple flow-rates. Data from the simulated DoE table was then used to generate an n-dimensional Response Surface (RS), which established pre-validated relationships of the output to the input parameters. Finally, a Multi Objective Genetic Algorithm (MOGA) technique was used to extract the most efficient designs satisfying other weighted goals or objectives. The weighting process forces some objectives to be sacrificed to a certain extent in favor of others, which is a good reflection of reality, since a trade-off between different objectives is an essential element of any design process. The predictions from the optimizer were then subjected to a final round of CFD simulations for validation. Two discrete application examples were used as test cases for this study, using the optimization template described in the foregoing. This multi objective optimization approach resulted in a performance improvement of 2 efficiency points over a mature baseline blade design, developed using an advanced proprietary design code. Traditional CFD-assisted design enhancements were found to provide less than 1 point of efficiency improvement over this baseline design.

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Strongin, Mikhail P. „Transient Calculations of Pump Performance Parameters“. In ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55303.

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The oscillations of pump performance parameters like head and power corresponding to a wide range of flow-rate values are investigated in the present paper. A centrifugal double suction industrial pump is studied with comparison of test, steady state and averaged transient results. Different turbulence closure models, such as k-ω, and k-ω SST were used. The oscillation behavior of the head and the power of pump is studied for three different pump geometries. The pump model consists of suction, impeller and discharge parts which are meshed and calculated together. This, for instance, naturally permits the effects of non uniformity of velocity distribution on the impeller eye and on the inlet of the discharge segment to be taken into account. The commercial code Fluent 6.3.26 is used for the CFD computations. The results show much better agreement of the test data with averaged transient calculations compared with steady state calculations, especially far away from best efficiency point on the performance curve. Besides, an interesting transient effect, doubling of the frequency of pump parameters oscillations (compared with the blade passing frequency w = n*N) is observed.

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Xie, Yiwei, Pingfang Hu, Fei Lei, Na Zhu und Lu Xing. „Parameters optimization of ground source heat pump system combined energy consumption and economic analysis using Taguchi method“. In International Ground Source Heat Pump Association. International Ground Source Heat Pump Association, 2018. http://dx.doi.org/10.22488/okstate.18.000047.

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Limei, Zhang, Qiao Xinqi, Cheng Yong und Wu Bo. „A Study on Dynamic Parameters of Fuel Injection Pump“. In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1991. http://dx.doi.org/10.4271/910186.

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Xiaoliang Xu, Huihua Liu und Weifeng Tan. „Parameters design of 1.25GHz low jitter charge pump PLL“. In 2011 International Conference on Electric Information and Control Engineering (ICEICE). IEEE, 2011. http://dx.doi.org/10.1109/iceice.2011.5777576.

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Matousek, D., O. Subrt und J. Hospodka. „Fitting simulated and measured parameters of Dickson charge pump“. In 2017 11th International Conference on Measurement. IEEE, 2017. http://dx.doi.org/10.23919/measurement.2017.7983553.

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Tyurin, A., A. Raykov, S. Salikeev, A. Burmistrov und E. Kapustin. „Experimental study of oil free scroll vacuum pump parameters“. In INTERNATIONAL CONFERENCE ON SCIENCE AND APPLIED SCIENCE (ICSAS2020). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0028646.

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8

Williams, Logan T. „Methodology for the Evaluation of Gear Pump Performance“. In BATH/ASME 2020 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fpmc2020-2763.

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Abstract Currently, most performance curves of gear pumps present volumetric efficiency as a function of one or more operating conditions. However, the nature of gear pumps is that volumetric efficiency is dependent on pump speed, pump pressure rise, and fluid viscosity. This dependency on multiple parameters impedes direct comparisons between pumps tested at disparate operating conditions or on different testbeds. A new method has been developed that formulates the volumetric efficiency as a function of a single parameter that captures pump speed, pressure, and fluid viscosity. The characteristics of the pump is then captured by curve fitting two constants to empirical data. This method allows extrapolation of pump performance beyond empirical data and direct comparison of the volumetric efficiency curves of two pumps tested under disparate conditions within a single plot. This work describes the analytical derivation of the methodology and the empirical data used for validations. Additionally, several possible applications of this method are presented.

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9

Arcoumanis, C., M. Gavaises, P. G. Bostock und R. W. Horrocks. „Evaluation of Pump Design Parameters in Diesel Fuel Injection Systems“. In International Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1995. http://dx.doi.org/10.4271/950078.

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Hsiao, Chluder, und Frank S. Tsay. „Evaluation Of Fracture Parameters Using Pump-In/Flow-Back Test“. In Annual Technical Meeting. Petroleum Society of Canada, 1990. http://dx.doi.org/10.2118/90-03.

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Berichte der Organisationen zum Thema "Pump parameters"

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Pag, F., M. Jesper, U. Jordan, W. Gruber-Glatzl und J. Fluch. Reference applications for renewable heat. IEA SHC Task 64, Januar 2021. http://dx.doi.org/10.18777/ieashc-task64-2021-0002.

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There is a high degree of freedom and flexibility in the way to integrate renewable process heat in industrial processes. Nearly in every industrial or commercial application various heat sinks can be found, which are suitable to be supplied by renewable heat, e.g. from solar thermal, heat pumps, biomass or others. But in contrast to conventional fossil fuel powered heating systems, most renewable heating technologies are more sensitive to the requirements defined by the specific demand of the industrial company. Fossil fuel-based systems benefit from their indifference to process temperatures in terms of energy efficiency, their flexibility with respect to part-load as well as on-off operation, and the fuel as a (unlimited) chemical storage. In contrast, the required temperature and the temporal course of the heat demand over the year determine whether a certain regenerative heat generator is technically feasible at all or at least significantly influence parameters like efficiency or coverage rate.

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