Relevant bibliographies by topics / Isentropic expansion

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Academic literature on the topic 'Isentropic expansion'

Author: Grafiati
Published: 2 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Isentropic expansion"

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Li, Hui, Wen Li, Xuehui Zhang, et al. "Characteristic of a multistage reheating radial inflow in supercritical compressed air energy storage with variable operating parameters." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 233, no. 3 (2018): 397–412. http://dx.doi.org/10.1177/0957650918787077.

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In the present study, aerodynamic performance of a four-stage reheating radial inflow turbine, which is adopted in the 1.5 MW supercritical compressed air energy storage system, is analyzed by using the method of integral numerical calculation. Results illustrate that when the inlet total pressure of the first stage is decreased, the expansion ratio of the fourth stage decreases the most. System isentropic efficiency decreases about 1% when the inlet total pressure of the first stage is changed from 7 MPa to 3 MPa, and the fourth stage’s isentropic efficiency decreases about 7%. When the rotat
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Nedanovska, E., G. Nersisyan, C. L. S. Lewis, and D. Riley. "Investigation of magnesium laser ablated plumes with Thomson scattering." Laser and Particle Beams 30, no. 2 (2012): 259–66. http://dx.doi.org/10.1017/s0263034612000018.

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AbstractOptical Thomson scattering has been implemented as a diagnostic of laser ablated plumes generated with second harmonic Nd:YAG laser radiation at 532 nm. Thomson scattering data with both spatial and temporal resolution has been collected, giving both electron density, and temperature distributions within the plume as a function of time. Although the spatial profiles do not match very well for simple models assuming either isothermal or isentropic expansion, consideration of the measured ablated mass indicates an isothermal expansion fits better than an isentropic expansion and indeed,
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Haifei, Zheng, Yu Xiqiao, and Tang Hao. "Study on aero engine thermal performance analysis using a new mathematical model of isentropic expansion (compression) process." Journal of Physics: Conference Series 2764, no. 1 (2024): 012041. http://dx.doi.org/10.1088/1742-6596/2764/1/012041.

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Abstract At present, for the research of aero engine performance, it is necessary to calculate the overall thermal performance of the aero engine at the beginning of the research. For the mathematical model of the isentropic expansion (compression) process, most researchers use the ideal state value to calculate in the mathematical model, so that the calculated results have a certain error compared with the actual value. Therefore, the new isentropic expansion (compression) process mathematical model based on the Φ function is applied in this paper to the technical aero engine overall thermal
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Zhang, Chenghu, Jiahao Gao, Jie Fu, Yaping Li, and Jiyou Lin. "Research on structural parameter optimization and thermal performance of twin-screw expander." International Journal of Low-Carbon Technologies 14, no. 3 (2019): 386–93. http://dx.doi.org/10.1093/ijlct/ctz026.

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Abstract This paper analyzes rotor profile and meshing law of twin-screw expander. Elementary area is calculated by meshing sequence method, and elementary volume is solved by integration. The influence of geometric characteristics such as torsion angle and internal expansion angle of male rotor on the thermal performance of twin-screw expander is studied. The results show the following: reasonably reducing internal expansion angle and positive rotor torsion angle can increase isentropic adiabatic power of twin-screw expander. Taking isentropic adiabatic efficiency as optimization goal, sequen
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Berera, Arjun, and Rudnei O. Ramos. "Absence of isentropic expansion in various inflation models." Physics Letters B 607, no. 1-2 (2005): 1–7. http://dx.doi.org/10.1016/j.physletb.2004.12.028.

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Petitpas, G., and S. M. Aceves. "The isentropic expansion energy of compressed and cryogenic hydrogen." International Journal of Hydrogen Energy 39, no. 35 (2014): 20319–23. http://dx.doi.org/10.1016/j.ijhydene.2014.10.031.

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Tsao, Chia-Cheng, Wen-Kai Lin, Kai-Yuan Lai, Savas Yavuzkurt, and Yao-Hsien Liu. "Numerical Investigation of Compression and Expansion Process of Twin-Screw Machine Using R-134a." Energies 16, no. 8 (2023): 3599. http://dx.doi.org/10.3390/en16083599.

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Increasing the efficiency of twin-screw machines is beneficial for gas compression and expansion applications. We used a computation fluid dynamic approach to obtain the flow field and efficiency of a twin-screw machine that used R-134a as the working fluid. The leakage flow and sealing lines were obtained to study their geometrical effects during the compression and expansion process. The effects of the wrap angle (280°, 290°, and 300°) and pressure ratios on the compression efficiency were studied. During the compression process, the volumetric efficiency was more than 70% regardless of the
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Smeyers, P., T. Van Hoolst, I. De Boeck, and L. Decock. "A New Asymptotic Treatment of g-modes of a Star." International Astronomical Union Colloquium 155 (1995): 285–86. http://dx.doi.org/10.1017/s025292110003712x.

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An asymptotic representation of low-frequency, linear, isentropic g-modes of a star is developed without the usual neglect of the Eulerian perturbation of the gravitational potential. Our asymptotic representation is based on the use of asymptotic expansions adequate for solutions of singular perturbation problems (see, e.g., Kevorkian & Cole 1981).Linear, isentropic oscillation modes with frequency different from zero are governed by a fourth-order system of linear, homogeneous differential equations in the radial parts of the radial displacement ξ(r) and the divergence α(r). These equati
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Slemrod, Marshall. "Admissibility of weak solutions for the compressible Euler equations, n ≥ 2." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 371, no. 2005 (2013): 20120351. http://dx.doi.org/10.1098/rsta.2012.0351.

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This paper compares three popular notions of admissibility for weak solutions of the compressible isentropic Euler equations of gas dynamics: (i) the viscosity criterion, (ii) the entropy inequality (the thermodynamically admissible isentropic solutions), and (iii) the viscosity–capillarity criterion. An exact summation of the Chapman–Enskog expansion for Grad’s moment system suggests that it is the third criterion that is representing the kinetic theory of gases. This, in turn, may shed some light on the ability to recover weak solutions of the Euler equations via a hydrodynamic limit.
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Lefebvre, Lucie, Ward De Paepe, Mario L. Ferrari, and Alberto Traverso. "Carnot cycle in practice: compensating inefficiencies of ORC expanders through thermal regeneration." E3S Web of Conferences 238 (2021): 10005. http://dx.doi.org/10.1051/e3sconf/202123810005.

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The Organic Rankine Cycle (ORC) is a thermodynamic cycle that can operate with a hot source over a wide range of temperatures, especially with low-grade heat (below 200°C). One of the main limitations for the success of small-scale ORC cycles (few to 100 kWe) is the relatively low isentropic efficiency of the typically used turbomachinery. Low turbine efficiency leads to low ORC cycle performance. To increase the performance of the cycle, the turbine efficiency must be increase, however, this significantly increases the cost of the machinery, making the cycle less profitable. In this work, the
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Books on the topic "Isentropic expansion"

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Escudier, Marcel. Oblique shockwaves and expansion fans. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198719878.003.0012.

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External supersonic gas flow in which changes in the fluid and flow properties are brought about by direction change is analysed in this chapter. In addition, it is shown that flow over a corner between two flat surfaces resulted in an oblique shockwave if the angle between the two surfaces is less than 180° (a concave corner). The analysis of flow through an oblique shockwave is based upon the superposition of the flowfield for a normal shock onto a uniform flow parallel to the shock. It is also shown that both weak and strong oblique shocks can occur. For an angle in excess of 180° (a convex
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Book chapters on the topic "Isentropic expansion"

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Liang, J., C. Q. Zhang, and Y. Zhou. "Experimental Study of the Isentropic Efficiency of the Pulse Tube Expansion Process." In Cryocoolers 9. Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-5869-9_56.

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Nandagopal, Nuggenhalli S. "Shock Waves and Shock Wave Relationships, Isentropic (Prandtl–Meyer) Expansion and Compression." In Compressible Flow. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-84752-3_5.

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Toennies, J. Peter. "Helium Nanodroplets: Formation, Physical Properties and Superfluidity." In Topics in Applied Physics. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94896-2_1.

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AbstractIn this introductory chapter, we begin by informing the reader about the fascinating history of superfluidity in bulk liquid helium. This is followed by relating attempts in using liquid helium as a low temperature matrix for spectroscopy. After a brief review of the thermodynamic properties of helium in Sect. 1.2, the different types of free jet expansions used in experiments to produce clusters and nanodroplets of different sizes are described in Sect. 1.3. First it is shown how they depend on the nature and location in the phase diagram of the isentropes which determine the course o
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Conti, Camilla C., Andrea Spinelli, and Alberto Guardone. "Similarity Parameters for Non-ideal One-Dimensional Isentropic Expansions." In Proceedings of the 3rd International Seminar on Non-Ideal Compressible Fluid Dynamics for Propulsion and Power. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69306-0_4.

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Zhang, Meiyan, Lingfeng Shi, Peng Hu, Gang Pei, and Gequn Shu. "Thermodynamic analysis of a novel pumped thermal energy storage system with waste heat integration." In Proceedings of the 7th International Seminar on ORC Power System (ORC 2023), 2024th ed. Editorial Universidad de Sevilla, 2024. http://dx.doi.org/10.12795/9788447227457_46.

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Pumped thermal energy storage (PTES) system is a large-scale electricity storage technique, and the thermally integrated PTES system has been brought forward to raise the energy storage efficiency and extend feasible ways to utilize the low-grade waste heat (<100 °C). The solutions to raise the power-topower efficiency of the thermally integrated PTES system have aroused much attention worldwide. This paper presents an innovative thermally integrated PTES system, in which the two-stage heat pump with an economizer is incorporated into the PTES system. Despite utilizing the waste heat at cha
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Conference papers on the topic "Isentropic expansion"

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Kouremenos, D. A., X. K. Kakatsios, O. E. Floratos, and G. Fountis. "Isentropic Expansion and the Three Isentropic Exponents of R152a." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0876.

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Abstract The isentropic change of an ideal gas is described by the well known relations pvk = const., Tv(k-1) = const. and p(1-k)Tk = const., where the exponent k is defined as the ratio of the constant pressure to the constant volume specific heat, k = Cp/Cv. The same relations can be used for real gases only if the differential isentropic changes under consideration are small. A better examination of the differential isentropic change shows that for p, v, T systems, there are three different isentropic exponents corresponding to each pair formed out of the variables p, v, T. These three expo
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Maytal, B. Z., J. G. Weisend, John Barclay, et al. "OPEN CYCLE JOULE-THOMSON CRYOCOOLING WITH PRIOR SEQUENCIAL ISENTROPIC EXPANSION." In ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the Cryogenic Engineering Conference - CEC, Vol. 52. AIP, 2008. http://dx.doi.org/10.1063/1.2908452.

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Majdalani, Joe, and Brian Maicke. "Inversion of the Fundamental Isentropic Expansion Equations in Variable Area Duct Flow." In 40th Fluid Dynamics Conference and Exhibit. American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-4861.

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Gudarenko, L. F. "Shock compression and isentropic expansion of tungsten, nickel and tin porous samples." In Shock compression of condensed matter. AIP, 2000. http://dx.doi.org/10.1063/1.1303454.

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Wettstein, Hans E. "History of Steam Expansion Machines Seen as Polytropic Efficiency Achievements." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-79398.

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Abstract Among the heat to power cycles the historically first successful technologies used cycles with steam expansion machines in its core. In the first phase as of the eighteenth century, reciprocating steam engines dominated. As of 1890 steam turbines were developed, which replaced the reciprocating steam engines until around 1930 with the exception of steam locomotives and some other niche applications. Up to now in steam cycle technology mostly the isentropic efficiency definition for expansion is used. Such numbers depend both on the dissipation and on the pressure ratio. In history the
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Nikolaev, D. N. "Study of Near-Critical Point Thermodynamics of Molybdenum by Isentropic Expansion and Isobaric Heating." In SHOCK COMPRESSION OF CONDENSED MATTER - 2003: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP, 2004. http://dx.doi.org/10.1063/1.1780460.

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Pack, David J., Terry J. Edwards, and Derek Fawcett. "Applications of Accurate Isentropic Exponent Determination for Fuel Gas Measurement." In ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-037.

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This paper discusses the determination and application of the isentropic exponent to the various thermodynamic processes found in a high pressure natural gas transmission system. Increasing demands for more precise measurement of natural gas, coupled with the need for greater efficiency and accountability of transportation and processing operations had led to our research and development efforts into the more precise measurement of gas flow, and the determination of gas thermodynamic properties including isentropic exponent. The isentropic exponent has many applications, some of which include:
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Wang, Xing, Yangli Zhu, Wen Li, Xuehui Zhang, and Haisheng Chen. "Effect of Matching Parameters Between Rotor and Diffuser on the Flow Loss Characteristic in an Axial Turbine." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15117.

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Abstract Diffuser is a key component affecting the aerodynamic performance of an axial turbine significantly. However, there is little research on the matching parameters between a rotor and a diffuser. In present study, effect of matching parameters which are normalized axial clearance (ACLR‘) and normalized radial size deviation (RDev‘) between rotor and diffuser on the aerodynamic performance and flow loss characteristic of a typical diffuser is revealed. A validated Computational Fluid Dynamic (CFD) model which couples the cavity between the rotor and diffuser is also proposed. The results
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Schmidt, Christian, and Chuan Miao. "Non-zero density QCD by the Taylor expansion method: The isentropic equation of state, hadronic fluctuations and more." In The XXVI International Symposium on Lattice Field Theory. Sissa Medialab, 2009. http://dx.doi.org/10.22323/1.066.0172.

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Cirligeanu, Radu, Alina Bogoi, and Radu D. Rugescu. "TRANSIT Code for Unsteady Flows in Solar-Gravity Draught Turbine Towers." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22518.

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Unsteady, non-isentropic, discontinuous flows with energy exchange, during solar heating transients of air turbine towers are approached through a proprietary computational front method, initially developed for the study of ignition in solid propellant rocket motors. Its application in the discontinuous flows with energy exchange also proves highly efficient. Computational efficiency is demonstrated by CFD simulation of transients in the air accelerator of the SEATTLER solar mirror, turbine tower. This is a typically unsteady flow simulation for slender channels. A 1-D computational scheme was
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Reports on the topic "Isentropic expansion"

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George. L52299 Revised Analysis of Orifice Meter Expansion Factor Data. Pipeline Research Council International, Inc. (PRCI), 2008. http://dx.doi.org/10.55274/r0010289.

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Orifice meter expansion factor data collected at Southwest Research Institute (SwRI) between 2003 and 2005 have been reviewed to assess the effect of an assumption made during data reduction. In accordance with the North American orifice meter standard, AGA Report No. 3, Part 1, the data were originally analyzed using a constant value of the isentropic exponent, k = 1.3. By comparison, the expansion factor equation adopted by ISO employs the real isentropic exponent, K, which is a function of pressure, temperature, and gas composition. The SwRI orifice meter expansion factor data have been re-
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