垂直密闭容器内辐射与自然对流的耦合传热

Coupling Heat Transfer by Radiation and Natural Convection in an Airtight Vertical Enclosure

用数值方法研究垂直密闭容器内，半透过性流体在辐射光的照射下产生的自然对流现象及其对热传递的影响．建立基于二维假设下的流体流动和热量传递的稳态数学模型，并用有限差分法进行数值求解，得到了等温线和流线图．结果表明，流体的自然对流和传热受流体的光学厚度的影响，理论计算与实验结果比较表明两者吻合．

A numerical study is devoted to the radiation-induced natural convection of a semitransparent fluid in an airtight vertical enclosure and its influence on heat-transfer.A steady-state mathematical model of fluid flow and thermal transmission based on two-dimensional hypothesis is set up at first,and then numerical solution is brought about by finite difference method, Thus an isotherm and a stream-line diagram under steady-state will be obtained. As shown by the result,natural convection and heat-transfer of fluid are influenced by optical thickness of fluid;and the result from theoretical calculation tallies with that from experiment.