化工学报2015，Vol.66Issue(Z1)：130-137,8.DOI:10.11949/j.issn.0438-1157.20150267
表面辐射对部分填充吸湿性多孔介质的封闭腔体内热湿耦合传递的影响
Effects of thermal radiation on natural convection heat and moisture transfer in rectangular enclosures partially filled with hygroscopic porous medium
摘要
Abstract
This paper deals with the effects of thermal radiation on natural convection heat and moisture transfer in rectangular enclosures partially filled with hygroscopic porous medium. The governing equations for the momentum, heat and moisture transfer were solved by the finite element method. The radiative heat transfer is calculated by making use of the radiosity of the surfaces that assumed to be grey. Comparisons with experimental and numerical results in the literature have been carried out. Effects of thermal radiation, Rayleigh number, Darcy number and a ratio,Rk, of thermal conductivity on natural convection, heat and moisture transfer in both free fluid and hygroscopic porous medium were analysed. It was found that the surface thermal radiation significantly alters the distribution of the temperature in rectangular enclosures and moisture content of hygroscopic porous medium even if the given emissivity is quite small, but there are no remarkable temperature and moisture content changes with the increase of emissivity from 0.5 to 1.0. The mean temperature at the interface and the moisture content in hygroscopic porous medium decrease with the increase ofRa. TheNuc on the side walls in the free flow and porous medium regions increase with the increase ofRa. The temperature and moisture content distributions change little in porous medium during heat and moisture content transfer with the increase ofRk while the mean convective Nusselt number on the side walls of rectangular enclosures changes very little in a range of givenDa and Rk.关键词
表面热辐射/自然对流/热湿传递/吸湿性多孔介质/封闭腔体Key words
surface thermal radiation/natural convection/heat and moisture transfer/hygroscopic porous medium/enclosure分类
能源科技引用本文复制引用
王远成,杨开敏,杨君..表面辐射对部分填充吸湿性多孔介质的封闭腔体内热湿耦合传递的影响[J].化工学报,2015,66(Z1):130-137,8.基金项目
国家自然科学基金项目(51276102).supported by the National Natural Science Foundation of China (51276102). （51276102）
