Relevant bibliographies by topics / Polytropic coefficient

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Conference papers

Academic literature on the topic 'Polytropic coefficient'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Polytropic coefficient"

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Zhang, Yahui, and Tielong Shen. "In-cylinder Pressure Pegging Algorithm Based on Cyclic Polytropic Coefficient Learning." International Journal of Automotive Engineering 8, no. 2 (2017): 79–86. http://dx.doi.org/10.20485/jsaeijae.8.2_79.

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Lin, Binbin, Nong Xiang, and Jing Ou. "The ion polytropic coefficient in a collisionless sheath containing hot ions." Physics of Plasmas 23, no. 8 (August 2016): 083508. http://dx.doi.org/10.1063/1.4960558.

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Liu, Dengming, and Changyu Liu. "Global Existence and Extinction Singularity for a Fast Diffusive Polytropic Filtration Equation with Variable Coefficient." Mathematical Problems in Engineering 2021 (April 28, 2021): 1–9. http://dx.doi.org/10.1155/2021/5577777.

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In this article, we deal with an inhomogeneous fast diffusive polytropic filtration equation. By using the energy estimate approach, Hardy–Littlewood–Sobolev inequality, and a series of ordinary differential inequalities, we prove the global existence result and obtain the conditions on the occurrence of the extinction phenomenon of the weak solution.
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Kim, Hyunseok, and Jihoon Lee. "The Incompressible Limits of Viscous Polytropic Fluids with Zero Thermal Conductivity Coefficient." Communications in Partial Differential Equations 30, no. 8 (July 2005): 1169–89. http://dx.doi.org/10.1080/03605300500257560.

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Zhan, Huashui, and Zhen Zhou. "The Well-Posedness of the Solutions Based on the L1 Initial Value Condition." Journal of Function Spaces 2018 (September 16, 2018): 1–12. http://dx.doi.org/10.1155/2018/6525637.

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The non-Newtonian polytropic filtration equation ut=div(a(x)|∇um|p-2∇um) is considered. Only if u0(x)∈L1(Ω), the well-posedness of solutions is studied. If the diffusion coefficient is degenerate on the boundary, then stability of the weak solutions is proved only depending upon the initial value conditions.
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Lapuerta, Magı́n, Octavio Armas, and Santiago Molina. "Study of the compression cycle of a reciprocating engine through the polytropic coefficient." Applied Thermal Engineering 23, no. 3 (February 2003): 313–23. http://dx.doi.org/10.1016/s1359-4311(02)00193-x.

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Hoffman, Mark A., Robert G. Prucka, and Zoran S. Filipi. "Real time calculation of residual gas fraction utilising the polytropic coefficient of compression." International Journal of Powertrains 6, no. 4 (2017): 383. http://dx.doi.org/10.1504/ijpt.2017.088509.

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Filipi, Zoran S., Mark A. Hoffman, and Robert G. Prucka. "Real time calculation of residual gas fraction utilising the polytropic coefficient of compression." International Journal of Powertrains 6, no. 4 (2017): 383. http://dx.doi.org/10.1504/ijpt.2017.10009491.

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Luo, Qing-he, Bai-gang Sun, and Hua-yu Tian. "The characteristic of polytropic coefficient of compression stroke in hydrogen internal combustion engine." International Journal of Hydrogen Energy 39, no. 25 (August 2014): 13787–92. http://dx.doi.org/10.1016/j.ijhydene.2014.04.035.

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Dewri, M. "A Magnetized Dark Energy Type R/W Model with Polytropic Equation of State in Brans-Dicke Theory." Journal of Scientific Research 12, no. 3 (May 1, 2020): 251–57. http://dx.doi.org/10.3329/jsr.v12i3.43313.

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In this paper, we study the spatially homogeneous Robertson-Walker cosmological models with magnetized isotropic dark energy like fluid in the scalar-tensor theory of gravitation proposed by Brans-Dicke. Variable cosmological constant ᴧ and Polytropic equation of state have been used to find exact solutions of the models with volumetric expansion and power-law relation. The Physical and dynamical behaviors of the models have been discussed using some physical quantities like energy density, pressure, and coefficient of bulk viscosity.
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Dissertations / Theses on the topic "Polytropic coefficient"

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Vansnick, Michel P. D. G. "Optimization of reciprocating compressor maintenance based on performance deterioration study." Doctoral thesis, Universite Libre de Bruxelles, 2006. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210800.

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Critical equipment plays an essential role in industry because of its lack of redundancy. Failure of critical equipment results in a major economic burden that will affect the profit of the enterprise. Lack of redundancy for critical equipment occurs because of the high cost of the equipment usually combined with its high reliability.

When we are analyzing the reliability of such equipment, as a result, there are few opportunities to crash a few pieces of equipment to actually verify component life.

Reliability is the probability that an item can perform its intended function for a specified interval of time under stated conditions and achieve low long-term cost of ownership for the system considering cost alternatives. From the economical standpoint, the overriding reliability issue is cost, particularly the cost of unreliability of existing equipment caused by failures.

Classical questions about reliability are:

·\
Doctorat en sciences appliquées
info:eu-repo/semantics/nonPublished

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Books on the topic "Polytropic coefficient"

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Yudaev, Vasiliy. Hydraulics. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/996354.

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The textbook corresponds to the general education programs of the general courses "Hydraulics" and "Fluid Mechanics". The basic physical properties of liquids, gases, and their mixtures, including the quantum nature of viscosity in a liquid, are described; the laws of hydrostatics, their observation in natural phenomena, and their application in engineering are described. The fundamentals of the kinematics and dynamics of an incompressible fluid are given; original examples of the application of the Bernoulli equation are given. The modes of fluid motion are supplemented by the features of the transient flow mode at high local resistances. The basics of flow similarity are shown. Laminar and turbulent modes of motion in pipes are described, and the classification of flows from a creeping current to four types of hypersonic flow around the body is given. The coefficients of nonuniformity of momentum and kinetic energy for several flows of Newtonian and non-Newtonian fluids are calculated. Examples of solving problems of transient flows by hydraulic methods are given. Local hydraulic resistances, their use in measuring equipment and industry, hydraulic shock, polytropic flow of gas in the pipe and its outflow from the tank are considered. The characteristics of different types of pumps, their advantages and disadvantages, and ways of adjustment are described. A brief biography of the scientists mentioned in the textbook is given, and their contribution to the development of the theory of hydroaeromechanics is shown. The four appendices can be used as a reference to the main text, as well as a subject index. Meets the requirements of the federal state educational standards of higher education of the latest generation. For students of higher educational institutions who study full-time, part-time, evening, distance learning forms of technological and mechanical specialties belonging to the group "Food Technology".
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Conference papers on the topic "Polytropic coefficient"

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Kuhn, S., D. D. Tskhakaya, N. Jelic, L. Kos, and J. Duhovnik. "Polytropic-coefficient function (PCF) VS. polytropic-exponent function (PEF)." In 2012 IEEE 39th International Conference on Plasma Sciences (ICOPS). IEEE, 2012. http://dx.doi.org/10.1109/plasma.2012.6383570.

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Lee, Kangyoon, Minsu Kwon, Myoungho Sunwoo, and Maru Yoon. "An In-Cylinder Pressure Referencing Method Based on a Variable Polytropic Coefficient." In Asia Pacific Automotive Engineering Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2007. http://dx.doi.org/10.4271/2007-01-3535.

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Kuhn, S., M. Kamran, N. Jelić, L. Kos, D. Tskhakaya, D. D. Tskhakaya, Bengt Eliasson, and Padma K. Shukla. "Closure of the hierarchy of fluid equations by means of the polytropic-coefficient function (PCF)." In NEW FRONTIERS IN ADVANCED PLASMA PHYSICS. AIP, 2010. http://dx.doi.org/10.1063/1.3533190.

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Deur, Josˇko, Davor Hrovat, Josˇko Petric´, and Zˇeljko Sˇitum. "A Control-Oriented Polytropic Model of SI Engine Intake Manifold." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41086.

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The paper presents experimental results which show significant changes of the intake manifold air temperature during fast tip-in/tip-out engine transients. An adequate two-state polytropic manifold model is developed and experimentally validated. An emphasis is on the derivation and parameterization of a time-variant structure of the heat transfer coefficient. The polytropic manifold model is extended to a three-state form for the more general case of different heat transfer properties for the manifold plenum and runners. An influence of the engine back flow on the runner thermal transients is observed. A simple extension of the three-state model with the back flow effect is proposed.
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Kilicarslan, Ali, and Norbert Mu¨ller. "Comparison of Subcooling Effect of Water as a Refrigerant With the Current Refrigerants." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13122.

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The performance comparison of water as a refrigerant (R718) with some prevailing refrigerants including R717, R290, R134a, R12, R22, and R152a is presented. A computer program simulating an actual vapor compression refrigeration cycle including subcooling was developed to calculate the coefficient of performances (COPs) for the different refrigerants. Evaporator temperatures above which water yields a better COP over the other refrigerants are investigated for subcooling case. The effect of degree of subcooling on the COPs is elaborated. For most of the refrigerants (R290, R134a, R12, R22, and R152a) the COP increases by around one percent (1%) per one Kelvin (1K) subcooling, while the COP for R718 and R717 increases by around 0.2 % and 0.5 % per one Kelvin (1K) subcooling. At constant evaporator temperature, increasing the degree of subcooling results in decrease of the relative COP gain of R718. R718 gives the highest relative COP increase at constant condenser temperature and polytropic efficiency. The effect of polytropic efficiency on the performance is also investigated. It is observed that the evaporator temperature range at which R718 presents a better COP than other refrigerants increases with increasing values of polytropic compressor efficiency if the degree of subcooling is kept constant.
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Liu, Yan, Li-hua Tao, Jian Wang, Yang Wang, Xue-jun Wang, and Wei Wang. "Influence of Reynolds Number on the Performance of Process Centrifugal Compressors." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56853.

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Over the past 60 years, effects of changes in Reynolds number on performance of centrifugal compressors have been widely investigated. However most of cases deal with those compressors with small or medium flow coefficients. Studies on the influence of Reynolds number on centrifugal compressors with large flow coefficients and high machine Mach number are rarely seen in the literature. This paper deals with two types of centrifugal compressors. One type of compressor (Model 1) has a relatively large capacity with high machine Mach number. The flow coefficient and machine Mach number are 0.16 and 1.05 respectively at the design condition. Those design parameters for the other type of compressor (Model 2) are 0.11 and 0.7 respectively. Both experimental and numerical results show that with increase in Re, aerodynamic performance of centrifugal compressors is improved. However, to what extent that improvement is gained depends on properties of the baseline compressor. When Reynolds number of Model 1 becomes about 5 times large due to increase in the inlet pressure, its polytropic efficiency is only improved 0.7% at the design point in experiment. Flow field inside the impeller is similar to its prototype. For Model 2, when Reynolds number becomes 1.78 times large due to scaling up, the polytropic efficiency of the enlarged one is improved about 2% at the design point. These results demonstrate that for a compressor with large flow coefficient and high machine Mach number, i.e. originally high Reynolds number, the influence of Reynolds number on its performance is limited. In addition to experiment and CFD, two empirical formulas are applied to work out performance correction due to a change in Reynolds number for Model 1 and Model 2. Although CFD results are more accurate than the empirical results, empirical formula is still useful to get relatively reliable performance correction.
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Pazzi, Simone, Francesco Martelli, Marco Giachi, and Michela Testa. "Application of a CFD-Based Program for the Optimization of a Centrifugal Impeller." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55220.

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A typical centrifugal impeller characterized by a low flow coefficient and cylindrical blades is redesigned by means of an intelligent automatic search program. The procedure consists of a Feasible Sequential Quadratic Programming (FSQP) algorithm [6] coupled to a Lazy Learning (LL) interpolator [1] to speed-up the process. The program is able to handle geometrical constraints to reduce the computational effort devoted to the analysis of non-physical configurations. The objective function evaluator is an in-house developed structured CFD code. The LL approximator is called each time the stored database can provide a sufficiently accurate performance estimate for a given geometry, thus reducing the effective CFD computations. The impeller is represented by 25 geometrical parameters describing the vane in the meridional and s-θ planes, the blade thickness and the leading edge shape. The optimisation is carried out on the impeller design point maximizing the polytropic efficiency with more or less constant flow coefficient and polytropic head. The optimization is accomplished keeping unaltered those geometrical parameters which have to be kept fixed in order to make the impeller fit the original stage. The optimisation, carried out on a cluster of sixteen PCs, is self-learning and leads to a geometry presenting an increased design point efficiency. The program is completely general and can be applied to any component which can be described by a finite number of geometrical parameters and computed by any numerical instrument to provide performance indices. The work presented in this paper has been developed inside the METHOD EC funded project for the implementation of new technologies for optimisation of centrifugal compressors.
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Tian, Zhitao, Qun Zheng, Bin Jiang, and Qingfang Zhu. "Investigation on the Highly Loaded Helium Compressor Based on Helium Thermophysical Properties: Part A — The Design of Highly Loaded Axial Helium Compressor." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63510.

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Helium is hard to be compressed with the traditional way of air compression because of thermophysical properties differences between helium and air, which would result in helium compressor being of much more stages and shorter blades. In this paper, based on the flowing features of helium, that is, the higher sound speed, the lower Mach number etc. which are also due to the specific thermophysical properties of helium, the design method of a highly loaded helium compressor is investigated in detail. The relationships between the highly loaded helium compressor flow coefficient, load coefficient, reaction degree and its efficiency and pressure ratio are systematically discussed. Then, to meet the higher efficiency and reliability requirements, unequal spanwise work distribution technique is implemented. The results indicate that a 16 stages helium compressor of a 300MW HTGR can be reduced to a 3 stages compressor by the highly loaded design method proposed in this paper, under the condition of the same tip tangential velocity. The polytropic efficiency is 90%, which is higher than that of the previous 16 stages compressor.
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Wolfe, Tristan, Yu-Tai Lee, and Michael E. Slipper. "An Off-Design Performance Prediction Model for Low-Speed Double-Discharge Centrifugal Fans." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94932.

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A generalized model for mapping the trend of the performance characteristics of a double-discharge centrifugal fan is developed based on the work by Casey and Robinson (C&R) which formulated compressor performance maps for tip-speed Mach numbers ranging from 0.4 to 2 using test data obtained from turbochargers with vaneless diffusers. The current paper focuses on low-speed applications for Mach number below 0.4. The C&R model uses four non-dimensional parameters at the design condition including the flow coefficient, the work input coefficient, the tip-speed Mach number and the polytropic efficiency, in developing a prediction model that requires limited geometrical knowledge of the centrifugal turbomachine. For the low-speed fan case, the C&R formulas are further modified to apply a low-speed, incompressible analysis. The effort described in this paper begins by comparing generalized results using efficiency data obtained from a series of fan measurements to that using the C&R model. For the efficiency map, the C&R model is found to heavily depend on the ratio of the flow coefficient at peak efficiency to that at the choke flow condition. Since choke flow is generally not applicable in the low-speed centrifugal fan operational environment, an alternate, but accurate estimation method based on fan free delivery derived from the fan test data is presented. Using this new estimation procedure, the modified C&R model predicts reasonably well using the double-discharge centrifugal fan data for high flow coefficients, but fails to correlate with the data for low flow coefficients. To address this undesirable characteristic, additional modifications to the C&R model are also presented for the fan application at low flow conditions. A Reynolds number correction is implemented in the work input prediction of the C&R model to account for low-speed test conditions. The new model provides reasonable prediction with the current fan data in both work input and pressure rise coefficients. Along with the developments for the efficiency and work input coefficient maps, the use of fan shut-off and free delivery conditions are also discussed for low-speed applications.
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Lee, Yu-Tai, Tristan Wolfe, and Michael E. Slipper. "A Performance Prediction Model for Low-Speed Centrifugal Fans." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-21969.

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A generalized model for mapping the trend of the performance characteristics of a double-discharge centrifugal fan is developed based on the work by Casey and Robinson (C&R) which formulated compressor performance maps for tip-speed Mach numbers ranging from 0.4 to 2 using test data obtained from turbochargers with vaneless diffusers. The current paper focuses on low-speed applications for Mach number below 0.4. The C&R model uses four non-dimensional parameters at the design condition including the flow coefficient, the work input coefficient, the tip-speed Mach number and the polytropic efficiency, in developing a prediction model that requires limited geometrical knowledge of the centrifugal turbomachine. For the low-speed fan case, the C&R formulas are further extended to a low-speed, incompressible analysis. The effort described in this paper begins by comparing generalized results using efficiency data obtained from a series of fan measurements to that using the C&R model. For the efficiency map, the C&R model is found to heavily depend on the ratio of the flow coefficient at peak efficiency to that at the choke flow condition. Since choke flow is generally not applicable in the low-speed centrifugal fan operational environment, an alternate, but accurate estimation method based on fan free delivery derived from the fan test data is presented. Using this new estimation procedure, the modified C&R model predicts reasonably well using the double-discharge centrifugal fan data for high flow coefficients, but fails to correlate with the data for low flow coefficients. To address this undesirable characteristic, additional modifications to the C&R model are also presented for the fan application at low flow conditions. A Reynolds number correction is implemented in the work input prediction of the C&R model to account for low-speed test conditions. The new model provides reasonable prediction with the current fan data in both work input and pressure rise coefficients. Along with the developments for the efficiency and work input coefficient maps, the use of fan shut-off and free delivery conditions are also discussed for low-speed applications.
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