Modeling natural convection heat transfer from perforated plates  

作　　者：Zan WU Wei LI Zhi-jian SUN Rong-hua HONG 

机构地区：[1]Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2012年第5期353-360,共8页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：supported by the National Key Technology R&D Program of China (No. 2012BAA10B01);the National Basic Research Program (973) of China (No. 2011CB710703);the Wu Zhong-hua Fund for excellent graduate students in China

摘　　要：Staggered pattern perforations are introduced to isolated isothermal plates,vertical parallel isothermal plates,and vertical rectangular isothermal fins under natural convection conditions.The performance of perforations was evaluated theoretically based on existing correlations by considering effects of ratios of open area,inclined angles,and other geometric parameters.It was found that staggered pattern perforations can increase the total heat transfer rate for isolated isothermal plates and vertical parallel plates,with low ratios of plate height to wall-to-wall spacing(H/s),by a factor of 1.07 to 1.21,while only by a factor of 1.03 to 1.07 for vertical rectangular isothermal fins,and the magnitude of enhancement is proportional to the ratio of open area.However,staggered pattern perforations are detrimental to heat transfer enhancement of vertical parallel plates with large H/s ratios.Staggered pattern perforations are introduced to isolated isothermal plates, vertical parallel isothermal plates, and vertical rectangular isothermal fins under natural convection conditions. The performance of perforations was evaluated theoret- ically based on existing correlations by considering effects of ratios of open area, inclined angles, and other geometric parameters. It was found that staggered pattern perforations can increase the total heat transfer rate for isolated isothermal plates and vertical parallel plates, with low ratios of plate height to wall-to-wall spacing （H/s）, by a factor of 1.07 to 1.21, while only by a factor of 1.03 to 1.07 for vertical rectangular isothermal fins, and the magnitude of enhancement is proportional to the ratio of open area. However, staggered pattern perforations are detrimental to heat transfer enhancement of vertical parallel plates with large It/s ratios.

关 键 词：Staggered pattern perforation Natural convection Inclined plate Parallel plate Rectangular fins 

分 类 号：TK01[动力工程及工程热物理]