The Experts below are selected from a list of 3873 Experts worldwide ranked by ideXlab platform
C C Hsiao - One of the best experts on this subject based on the ideXlab platform.
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combustion of Liquid Fuel Droplets in supercritical conditions
Combustion and Flame, 1992Co-Authors: J S Shuen, Vigor Yang, C C HsiaoAbstract:Abstract A comprehensive analysis of Liquid-Fuel Droplet combustion in both subcritical and supercritical environments has been conducted. The formulation is based on the complete conservation equations for both gas and Liquid phases, and accommodates variable thermophysical properties, finite-rate chemical kinetics, and a full treatment of Liquid-vapor phase equilibrium at the Droplet surface. The governing equations and associated interfacial boundary conditions are solved numerically using a fully coupled, implicit scheme with the dual time-stepping integration technique. The model is capable of treating the entire Droplet history, including the transition from the subcritical to supercritical state. As a specific example, the combustion of n-pentane Fuel Droplets in air is studied for pressures in the range of 5–140 atm. Results indicate that the ambient gas pressure exerts significant control of Droplet gasification and burning processes through its influence on fluid transport, gas-Liquid interfacial thermodynamics, and chemical reactions. The Droplet gasification rate increases progressively with pressure. However, the data for the overall burnout time exhibit a considerable change in the combustion mechanism at the critical pressure, mainly as a result of reduced mass diffusivity and latent heat of vaporization with increased pressure. The influence of Droplet size on the burning characteristics is also noted.
J S Shuen - One of the best experts on this subject based on the ideXlab platform.
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combustion of Liquid Fuel Droplets in supercritical conditions
Combustion and Flame, 1992Co-Authors: J S Shuen, Vigor Yang, C C HsiaoAbstract:Abstract A comprehensive analysis of Liquid-Fuel Droplet combustion in both subcritical and supercritical environments has been conducted. The formulation is based on the complete conservation equations for both gas and Liquid phases, and accommodates variable thermophysical properties, finite-rate chemical kinetics, and a full treatment of Liquid-vapor phase equilibrium at the Droplet surface. The governing equations and associated interfacial boundary conditions are solved numerically using a fully coupled, implicit scheme with the dual time-stepping integration technique. The model is capable of treating the entire Droplet history, including the transition from the subcritical to supercritical state. As a specific example, the combustion of n-pentane Fuel Droplets in air is studied for pressures in the range of 5–140 atm. Results indicate that the ambient gas pressure exerts significant control of Droplet gasification and burning processes through its influence on fluid transport, gas-Liquid interfacial thermodynamics, and chemical reactions. The Droplet gasification rate increases progressively with pressure. However, the data for the overall burnout time exhibit a considerable change in the combustion mechanism at the critical pressure, mainly as a result of reduced mass diffusivity and latent heat of vaporization with increased pressure. The influence of Droplet size on the burning characteristics is also noted.
Vigor Yang - One of the best experts on this subject based on the ideXlab platform.
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combustion of Liquid Fuel Droplets in supercritical conditions
Combustion and Flame, 1992Co-Authors: J S Shuen, Vigor Yang, C C HsiaoAbstract:Abstract A comprehensive analysis of Liquid-Fuel Droplet combustion in both subcritical and supercritical environments has been conducted. The formulation is based on the complete conservation equations for both gas and Liquid phases, and accommodates variable thermophysical properties, finite-rate chemical kinetics, and a full treatment of Liquid-vapor phase equilibrium at the Droplet surface. The governing equations and associated interfacial boundary conditions are solved numerically using a fully coupled, implicit scheme with the dual time-stepping integration technique. The model is capable of treating the entire Droplet history, including the transition from the subcritical to supercritical state. As a specific example, the combustion of n-pentane Fuel Droplets in air is studied for pressures in the range of 5–140 atm. Results indicate that the ambient gas pressure exerts significant control of Droplet gasification and burning processes through its influence on fluid transport, gas-Liquid interfacial thermodynamics, and chemical reactions. The Droplet gasification rate increases progressively with pressure. However, the data for the overall burnout time exhibit a considerable change in the combustion mechanism at the critical pressure, mainly as a result of reduced mass diffusivity and latent heat of vaporization with increased pressure. The influence of Droplet size on the burning characteristics is also noted.
Vigo Yang - One of the best experts on this subject based on the ideXlab platform.
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pressure coupled vaporization response of n pentane Fuel Droplet at subcritical and supercritical conditions
Proceedings of the Combustion Institute, 2011Co-Authors: George C Hsiao, Hua Meng, Vigo YangAbstract:Abstract The dynamic response of a Liquid Fuel Droplet to externally impressed pressure oscillations is studied comprehensively over a wide range of mean pressures. Both subcritical and supercritical conditions are considered. The formulation treats a complete set of conservation equations and incorporates real fluid thermodynamics and transport theories. As a specific example, the situation with isolated n -pentane Droplets in nitrogen is studied at various forcing frequencies. Results are correlated with the Liquid thermal inertial time, instantaneous Droplet radius, and oscillation frequency. The magnitude of the vaporization response increases with increasing pressure, mainly due to the decreased enthalpy of vaporization at high pressures. The increased sensitivity of Droplet thermophysical properties to ambient flow variations at high pressures also plays a role. The phase angle of the vaporization response function, however, appears to be independent of the ambient pressure. An abrupt increase in the response function takes place when the Droplet surface reaches its critical mixing state. A major factor contributing to this phenomenon is the abnormal variations of fluid thermophysical properties near the critical mixing point.
George C Hsiao - One of the best experts on this subject based on the ideXlab platform.
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pressure coupled vaporization response of n pentane Fuel Droplet at subcritical and supercritical conditions
Proceedings of the Combustion Institute, 2011Co-Authors: George C Hsiao, Hua Meng, Vigo YangAbstract:Abstract The dynamic response of a Liquid Fuel Droplet to externally impressed pressure oscillations is studied comprehensively over a wide range of mean pressures. Both subcritical and supercritical conditions are considered. The formulation treats a complete set of conservation equations and incorporates real fluid thermodynamics and transport theories. As a specific example, the situation with isolated n -pentane Droplets in nitrogen is studied at various forcing frequencies. Results are correlated with the Liquid thermal inertial time, instantaneous Droplet radius, and oscillation frequency. The magnitude of the vaporization response increases with increasing pressure, mainly due to the decreased enthalpy of vaporization at high pressures. The increased sensitivity of Droplet thermophysical properties to ambient flow variations at high pressures also plays a role. The phase angle of the vaporization response function, however, appears to be independent of the ambient pressure. An abrupt increase in the response function takes place when the Droplet surface reaches its critical mixing state. A major factor contributing to this phenomenon is the abnormal variations of fluid thermophysical properties near the critical mixing point.