The Experts below are selected from a list of 249 Experts worldwide ranked by ideXlab platform
R Mahalingam - One of the best experts on this subject based on the ideXlab platform.
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unsteady adiabatic Isentropic Expansion of gas into vacuum from a toroidal puff valve
Journal of Applied Physics, 1990Co-Authors: Patrick D Pedrow, Abutaher M Nasiruddin, R MahalingamAbstract:Observations were made on the Expansion of polyatomic (CF4) and diatomic (O2) gases into vacuum from a toroidal puff valve. Fast ionization gauge measurements have been compared with an unsteady adiabatic Isentropic model. Observed temporal and spatial gas density profiles closely followed model predictions until the arrival of gas reflected from the upstream wall of the vacuum vessel.
O E Floratos - One of the best experts on this subject based on the ideXlab platform.
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Description of the real gas Isentropic changes for an ammonia-water vapor mixture
Acta Mechanica, 1996Co-Authors: D A Kouremenos, X K Kakatsios, O E FloratosAbstract:The NH3-H2O binary mixture is used extensively in industrial refrigeration or heat-pump applications while it is a candidate for future units working with resorption-compression [1]. In this paper, the thermodynamic changes of an ammonia-water mixture in the vapor phase, along an Isentropic Expansion, have been calculated numerically for a starting point with a temperature of 800 degrees C and initial pressures of 20, 30, 40, and 50 bar. For this purpose, a special computer program, ISENEXPR, has been developed. The thermodynamic relations used were obtained in terms of the Gibbs free energy equation for the gas phase of pure components [1], [3], [6] and the entropy was held constant with an accuracy better than 0.000001 kJ/kgK. The runs performed for Isentropic Expansions showed a dependence of the Isentropic on the both exponents initial pressure and NH3 mass fraction xi, while the other properties depend on varying degrees upon xi. Results are given in the form of diagrams, describing the Isentropic change of the NH3-H2O gas phase mixture
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development of a computer program describing the real gas Isentropic Expansion of an ammonia water vapor mixture
Advances in Engineering Software, 1996Co-Authors: D A Kouremenos, X K Kakatsios, O E FloratosAbstract:Abstract A special computer program has been developed, using QBASIC, to calculate numerically the thermodynamic changes of an ammonia-water vapor mixture along an Isentropic Expansion. The thermodynamic relations used were obtained in terms of the Gibbs' free energy equation for the gas phase of pure components and the entropy was held constant with an accuracy better than 0·000001 kJ/kg K. Results are in the form of tables allowing further processing by spreadsheet software such as Excel, Works or Lotus in order to obtain them in diagram form.
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Description of the real gas Isentropic changes for an ammonia-water vapor mixture
Acta Mechanica, 1996Co-Authors: D A Kouremenos, X K Kakatsios, O E FloratosAbstract:The NH_3−H_2O binary mixture is used extensively in industrial refrigeration or heat-pump applications while it is a candidate for future units working with resorption-compression [1]. In this paper, the thermodynamic changes of an ammonia-water mixture in the vapor phase, along an Isentropic Expansion, have been calculated numerically for a starting point with a temperature of 800°C and initial pressures of 20, 30, 40, and 50 bar. For this purpose, a special computer program, ISENEXPR, has been developed. The thermodynamic relations used were obtained in terms of the Gibbs free energy equation for the gas phase of pure components [1], [3], [6] and the entropy was held constant with an accuracy better than 0.000 001 kJ/kg K. The runs performed for Isentropic Expansions showed a dependence of the Isentropic on the both exponents initial pressure and NH_3 mass fraction ξ, while the other properties depend on varying degrees upon ξ. Results are given in the form of diagrams, describing the Isentropic change of the NH_3−H_2O gas phase mixture.
G V Simakov - One of the best experts on this subject based on the ideXlab platform.
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shock compression and Isentropic Expansion of tungsten nickel and tin porous samples
SHOCK COMPRESSION OF CONDENSED MATTER - 1999, 2001Co-Authors: L F Gudarenko, O N Gushchina, M V Zhernokletov, A B Medvedev, G V SimakovAbstract:The paper studies Isentropic Expansion of shock-compressed tungsten, nickel and tin porous samples from 60–150 GPa Hugoniot states to states taking place at release to air. The obtained data is compared to computations with two wide-range model equations of state.
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shock compression and Isentropic Expansion of porous samples of tungsten nickel and tin
High Temperature, 2000Co-Authors: L F Gudarenko, O N Gushchina, M V Zhernokletov, A B Medvedev, G V SimakovAbstract:The Isentropic Expansion is investigated of shock-compressed porous samples of tungsten, nickel, and tin from the states on shock adiabats at a pressure of 60–150 GPa to states realized under conditions of release into air. The obtained data are compared with the results of calculations by two wide-range model equations of state.
Klaus Sokolowski-tinten - One of the best experts on this subject based on the ideXlab platform.
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Physical mechanisms of short-pulse laser ablation
Applied Surface Science, 2000Co-Authors: D. Von Der Linde, Klaus Sokolowski-tintenAbstract:The femtosecond pulsed laser ablation of metals and semiconductors in a laser fluence regime below the onset of plasma formation was investigated. Time-resolved microscopy demonstrated that the actual ablation process took much longer than the thermalization of the absorbed laser energy. Laser excitation led to isochronic heating of the material to a hot, pressurized fluid state, followed by Isentropic Expansion into vacuum. During Expansion and cooling, the system runs into the liquid-gas coexistence regime and decomposition into an inhomogeneous phase of gas and liquid took place.
Patrick D Pedrow - One of the best experts on this subject based on the ideXlab platform.
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unsteady adiabatic Isentropic Expansion of gas into vacuum from a toroidal puff valve
Journal of Applied Physics, 1990Co-Authors: Patrick D Pedrow, Abutaher M Nasiruddin, R MahalingamAbstract:Observations were made on the Expansion of polyatomic (CF4) and diatomic (O2) gases into vacuum from a toroidal puff valve. Fast ionization gauge measurements have been compared with an unsteady adiabatic Isentropic model. Observed temporal and spatial gas density profiles closely followed model predictions until the arrival of gas reflected from the upstream wall of the vacuum vessel.
