Infrared experiment on the wall temperature distribution for a particle packed channel with constant heat flux  

作　　者：Jianhua Du Xuejiao Hu Bin Ma Wei Wu Buxuan Wang 

机构地区：[1]Tsing Hua Univ, Dept Thermal Engn, Beijing 100084, Peoples R China

出　　处：《Chinese Science Bulletin》2001年第18期1566-1568,共3页

基　　金：This work was supported by the National Natural Science Foundation of China (Grant No. 59995550-3).

摘　　要：With constant heat flux, wall temperature distribution for a particle filled channel was measured using infrared thermal vision technology. It was found that non-uniform relative high-temperature regions were randomly distributed on the heating wall, possibly due to the lower flow velocity, or even due to the blocked flow near the points where particles contact with the heating wall directly. Not only porosity but also the size and shape of the pores are changed in the wall region of particle-packed structures, because of the limitation of the wall, and the changes affect largely the fluid flow and heat transfer. The transition of the flow pattern in pores can be inferred according to the variation of Nu with Re, where the area weighted wall temperature is adopted to calculate the Nu.With constant heat flux, wall temperature distribution for a particle filled channel was measured using infrared thermal vision technology. It was found that nonuniform relative high-temperature regions were randomly distributed on the heating wall, possibly due to the lower flow velocity, or even due to the blocked flow near the points where particles contact with the heating wall directly. Not only porosity but also the size and shape of the pores are changed in the wall region of particle-packed structures, because of the limitation of the wall, and the changes affect largely the fluid flow and heat transfer. The transition of the flow pattern in pores can be inferred according to the variation of Nu with Re, where the area weighted wall temperature is adopted to calculate the Nu.

关 键 词：POROUS MEDIA HEAT TRANSFER enhancement INFRARED thermograph. 

分 类 号：TK124[动力工程及工程热物理—工程热物理]