The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform
Yuqing Feng - One of the best experts on this subject based on the ideXlab platform.
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prediction of mass flow rate in supersonic natural Gas processing
Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles, 2015Co-Authors: Yan Yang, Chuang Wen, Xuewen Cao, Yuqing FengAbstract:The mass flow rate of natural Gas through the supersonic separator was numerically calculated by various cubic equations of state. The numerical results show that the compressibility factor and specific heat ratio for ideal Gas Law diverge remarkably from real Gas models at a high inlet pressure. Simultaneously, the deviation of mass flow calculated by the ideal and real Gas models reaches over 10 %. The difference increases with the lower of the inlet temperature regardless of the inlet pressure. A higher back pressure results in an earlier location of the shock wave. The pressure ratio of 0.72 is the first threshold to get the separator work normally. The second threshold is 0.95, in which case the whole flow is subsonic and cannot reach the choked state. The shock position moves upstream with the real Gas model compared to the ideal Gas Law in the cyclonic separation section.
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Numerical simulation of real Gas flows in natural Gas supersonic separation processing
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Yan Yang, Chuang Wen, Shuli Wang, Yuqing FengAbstract:The real Gas effects on natural Gas supersonic separation were investigated using a computational fluid dynamics approach with ideal Gas and real Gas models. The computed results showed that the fluid properties calculated by the ideal Gas Law diverged significantly from the real Gas cases in the supersonic zones, while the real Gas models predicted a similar result from one to the other. The deviation of the Gas Mach number between the ideal and real Gas models was about 13.50% at the nozzle exit, while the error in the Gas density was more than 20% in the whole supersonic separators. The shock wave position calculated by the real Gas model was ahead of the one calculated by the ideal Gas Law. The shock position moved forward with the increasing inlet pressure, while the real Gas predicted value was always in front of the ideal Gas value. The relative error of the Gas Mach number exceeded 15% with an inlet temperature of 283K.
Yan Yang - One of the best experts on this subject based on the ideXlab platform.
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prediction of mass flow rate in supersonic natural Gas processing
Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles, 2015Co-Authors: Yan Yang, Chuang Wen, Xuewen Cao, Yuqing FengAbstract:The mass flow rate of natural Gas through the supersonic separator was numerically calculated by various cubic equations of state. The numerical results show that the compressibility factor and specific heat ratio for ideal Gas Law diverge remarkably from real Gas models at a high inlet pressure. Simultaneously, the deviation of mass flow calculated by the ideal and real Gas models reaches over 10 %. The difference increases with the lower of the inlet temperature regardless of the inlet pressure. A higher back pressure results in an earlier location of the shock wave. The pressure ratio of 0.72 is the first threshold to get the separator work normally. The second threshold is 0.95, in which case the whole flow is subsonic and cannot reach the choked state. The shock position moves upstream with the real Gas model compared to the ideal Gas Law in the cyclonic separation section.
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Numerical simulation of real Gas flows in natural Gas supersonic separation processing
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Yan Yang, Chuang Wen, Shuli Wang, Yuqing FengAbstract:The real Gas effects on natural Gas supersonic separation were investigated using a computational fluid dynamics approach with ideal Gas and real Gas models. The computed results showed that the fluid properties calculated by the ideal Gas Law diverged significantly from the real Gas cases in the supersonic zones, while the real Gas models predicted a similar result from one to the other. The deviation of the Gas Mach number between the ideal and real Gas models was about 13.50% at the nozzle exit, while the error in the Gas density was more than 20% in the whole supersonic separators. The shock wave position calculated by the real Gas model was ahead of the one calculated by the ideal Gas Law. The shock position moved forward with the increasing inlet pressure, while the real Gas predicted value was always in front of the ideal Gas value. The relative error of the Gas Mach number exceeded 15% with an inlet temperature of 283K.
Chuang Wen - One of the best experts on this subject based on the ideXlab platform.
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prediction of mass flow rate in supersonic natural Gas processing
Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles, 2015Co-Authors: Yan Yang, Chuang Wen, Xuewen Cao, Yuqing FengAbstract:The mass flow rate of natural Gas through the supersonic separator was numerically calculated by various cubic equations of state. The numerical results show that the compressibility factor and specific heat ratio for ideal Gas Law diverge remarkably from real Gas models at a high inlet pressure. Simultaneously, the deviation of mass flow calculated by the ideal and real Gas models reaches over 10 %. The difference increases with the lower of the inlet temperature regardless of the inlet pressure. A higher back pressure results in an earlier location of the shock wave. The pressure ratio of 0.72 is the first threshold to get the separator work normally. The second threshold is 0.95, in which case the whole flow is subsonic and cannot reach the choked state. The shock position moves upstream with the real Gas model compared to the ideal Gas Law in the cyclonic separation section.
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Numerical simulation of real Gas flows in natural Gas supersonic separation processing
Journal of Natural Gas Science and Engineering, 2014Co-Authors: Yan Yang, Chuang Wen, Shuli Wang, Yuqing FengAbstract:The real Gas effects on natural Gas supersonic separation were investigated using a computational fluid dynamics approach with ideal Gas and real Gas models. The computed results showed that the fluid properties calculated by the ideal Gas Law diverged significantly from the real Gas cases in the supersonic zones, while the real Gas models predicted a similar result from one to the other. The deviation of the Gas Mach number between the ideal and real Gas models was about 13.50% at the nozzle exit, while the error in the Gas density was more than 20% in the whole supersonic separators. The shock wave position calculated by the real Gas model was ahead of the one calculated by the ideal Gas Law. The shock position moved forward with the increasing inlet pressure, while the real Gas predicted value was always in front of the ideal Gas value. The relative error of the Gas Mach number exceeded 15% with an inlet temperature of 283K.
Andreas Stadler - One of the best experts on this subject based on the ideXlab platform.
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Analyzing UV/Vis/NIR Spectra-Sputtered ZnO:Al Thin-Films—II: Gas Law Dependencies
IEEE Transactions on Semiconductor Manufacturing, 2011Co-Authors: Andreas StadlerAbstract:Exact, contact-free, and non-destructive optical analysis of transparent conductive oxide (TCO) layers was still done with an extended single layer model (see Analyzing UV/Vis/NIR Spectra-Sputtered ZnO:Al Thin-Films-I: Space-Time Dependencies). Extending this single layer model for use with double layer systems, as TCO thin-films upon substrates, includes an approximation, which is usually negligible. Therefore, a non-numerical theoretical model for analyzing complete double-layer systems (DLM), without any approximations, is provided here. Complex parameter evaluation is possible. For Part I, the influence of geometrical and temporary conditions within the sputter chamber, as target-substrate distance dTarSub, position r upon the substrate and sputter duration tSp, on thin-film parameters were investigated. Here, this exact data acquisition model for double layer systems (DLM) provides by far deeper insight in thin-film parameter dependences from the equation of state for real Gases (Gas Law) during the sputter process. Therefore, ZnO:Al thin-films upon boron silicate glass substrates have been analyzed with respect to the argon pressure, p, within the process-chamber and the substrate-temperature, T. Again, the results were compared with those of the well-known Keradec/Swanepoel model. The necessity of taking both spectra-transmission and reflection spectra-into account has been shown. A non-contact, optical conductivity measurement possibility by use of UV/Vis/NIR spectroscopy has been provided. Optically measured conductivities, σL, were compared with those, measured electrically with a four-tip measurement system.
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Analysing UV/Vis/NIR spectra with the double-layer model — Sputtered SnS thin-films II: Gas Law and plasma parameter dependencies
Thin Solid Films, 2011Co-Authors: Andreas Stadler, Herbert DittrichAbstract:Abstract Exact, contact-free and non-destructive optical analysis methods are advantageous for controlled thin-film deposition processes, especially for optical detector and solar cell applications. Within this second part, of a bipartite publication, a non-numerical theoretical model – the double-layer model – has been presented to extract approximation-free optical and electrical data from ultra-violet/visible/near infra-red spectra. So, analysis of double-layer systems, as thin-films upon substrates, was possible. Complex parameter evaluation is possible. This exact data acquisition model provides insights in the process-parameter dependencies of radio frequency sputtered, opaque tin-sulphide thin-films upon glass substrates. They have been analysed on the one hand with respect to the equation of state for real Gases (Gas Law). Therefore, the argon pressure within the process-chamber and the substrate-temperature were varied. On the other hand, tin-sulphide layers have been properly analysed and discussed with respect to plasma-parameter dependencies. Therefore, the frequency, the break time and the power of the plasma-building electromagnetic fields were varied. The systematic influence of these process parameters on a variety of opto-electric physical values of the tin-sulphide thin-films was worked out, carefully. Results were compared with those of the well-known Keradec/Swanepoel model. The necessity of taking both spectra – transmission and reflection spectra – into account has been shown. A non-contact, optical conductivity measurement possibility by use of ultra-violet/visible/near infra-red spectroscopy has been provided. Contact-free, optically measured conductivities were compared with those, measured electrically with a conventional four-tip measurement system.
S S Bandyopadhyay - One of the best experts on this subject based on the ideXlab platform.
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numerical investigation of Gas species and energy separation in the ranque hilsch vortex tube using real Gas model
International Journal of Refrigeration-revue Internationale Du Froid, 2011Co-Authors: T Dutta, K P Sinhamahapatra, S S BandyopadhyayAbstract:Abstract A three dimensional Computational Fluid Dynamics (CFD) model is used to investigate the phenomena of energy and species separation in a vortex tube (VT) with compressed air at normal atmospheric temperature and cryogenic temperature as the working fluid. In this work the NIST real Gas model is used for the first time to accurately compute the thermodynamic and transport properties of air inside the VT. CFD simulations are carried out using the perfect Gas Law as well. The computed performance curves (hot and cold outlet temperatures versus hot outlet mass fraction) at normal atmospheric temperature obtained with both the real Gas model and the perfect Gas Law are compared with the experimental results. The separation of air into its main components, i.e. oxygen and nitrogen is observed, although the separation effect is very small. The magnitudes of both the energy separation and the species separation at cryogenic temperature were found to be smaller than those at normal atmospheric temperature.
