辐射引起倾斜密闭容器内半透过性流体自然对流的研究

STUDY ON RADIATION-INDUCED NATURAL CONVECTION OF SEMI-TRANSPARENT FLUID IN INCLINED ENCLOSURE

用实验和数值两种方法研究了倾斜密闭容器中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传热的影响.首先建立了基于二维假设下的流体流动和热量传递的动态数学模型，并用有限差分方向交替法进行数值求解，得到稳态下的等温线和流线图.结果表明，流体的自然对流和传热受光学厚度和容器倾斜角度的影响.还建立了实验装置，测量了稳态下的温度分布．理论计算与实验结果比较表明两者的变化趋势一致，吻合较好．

The natural convection of a semi-transparent fluid in an inclined rectangular enclosure irradiated from one boundary was studied numerically and experimentally for the inclination from 0 toπ/2. Two-dimensional motion was assumed.The governing vorticity and energy transport equations were solved by an implicit alternating direction finite-difference method.Steady state isothermals and streamlines were abtained.It was found that the flow pattern was influenced byoptical thickness and inclined angle.A single motion cell was observed when the inclined angle was greater than 6.5π/180,When the inclined angle was equal to 6.25π/180,6π/180,5π/180 and 0,the stable motion mode was observed to be 3,5,7,and 9 roll-cells respectively.A comparison is made with experimental temperature measurement and found to be good.