A UNIQUE WAY FOR MAXIMIZING TURBULENT FREE CONVECTION FROM HEATED VERTCAL PLATES TO COLD GASES
The present paper investigates a promising avenue for the intensification of turbulent free convection in square cavities using an adequate selection of binary gas mixtures. The central idea in this paper is to examine the attributes that binary gas mixtures having helium as the principal gas and xenon, nitrogen, oxygen, carbon dioxide, methane, tetrafluoromethane, and sulfur hexafluoride, as secondary gases may bring forward. From fluid physics, it is known that the thermo-physical properties affecting free convection with binary gas mixtures are viscosity, thermal conductivity, density, and heat capacity at constant pressure. The quartet viscosity, thermal conductivity, density, and heat capacity is represented by triple-valued functions of the film temperature the pressure and the molar gas composition. The viscosity and thermal conductivity are obtained from the Kinetic Theory of Gases. The density is determined with a truncated virial equation of state. The heat capacity at constant pressure is calculated from Statistical Thermodynamics merged with the standard mixing rule. The numerical temperature fields for the seven binary gas mixtures He+CO2, He+CH4, He+N2, He+O2, He+Xe, He+CF4 and He+SF6 are channeled through the allied mean convection coefficient varying with the molar gas composition. For the seven binary gas mixtures utilized, the allied mean convection coefficient versus the molar gas composition is graphed in congruous diagrams.
Mohammad Reza Mobinipouya Mohammad Mehdi Papari
Institute for Teacher Education Organization of Fars Province Shiraz, Iran Department of Chemistry Shiraz University Shiraz, Iran
国际会议
The Ninth Asian Thermophysical Properties Conference(第九届亚洲热物理性能会议 ATPC 2010)
北京
英文
646-649
2010-10-19（万方平台首次上网日期，不代表论文的发表时间）