Heat Transfer Enhancement of Porous Foams and Analysis with Field Synergy Principle
LEI Hong1, ZHANG Xinming1, WANG Jiping2
1 Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education, Chongqing University, Chongqing 400030; 2 CPI Yuanda Environmental Protection Engineering Co., Ltd., Chongqing 400060
Abstract: The porous foams used in practical production applications are usually non-uniform foams. In this paper, uniform and non-uniform heat transfer models of porous foams were established to study the effects of porosity, pore density and air flow ve-locity on the synergy performance of velocity and temperature gradient in the downstream.The field synergy principle was employed to analyze the heat transfer enhancement mechanism in a rectangle channel inserted with porous foam under single phase convective heat transfer condition. The results suggest that the field synergy principle can be applied to analyze the convective heat transfer of porous foams. The synergistic degree was better at the center of the pore than the posterior edge of the skeleton. The synergistic degree was the worst at the edge of the skeleton, where the synergetic angle was about 90°. In other words, the porous foam improved the coordination between the velocity and temperature gradient for connective heat transfer in the channel and remarkably enhanced the heat transfer. Non-uniform porous foam had poor degree of coordination near the wall and the average synergetic angle of whole field was larger than that of uniform porous foams. The more uniform the better the synergistic condition of the porous foam, it was also found that the strength of uniform porous foam heat transfer enhancement was more than 1.2 times of non-uniform porous foam at the same velocity, pore density and porosity. The calculated results showed that the enhanced heat transfer intensities of the porous foams with porosities of 0.8, 0.85 and 0.9 were 3.3, 1.9 and 1.2 times that of the ordinary straight fin heat exchanger at the speed of 3 m/s,which has a guiding significant for the design of new heat exchanger.
雷鸿, 张新铭, 王济平. 多孔泡沫材料强化传热特性及场协同分析[J]. 材料导报, 2018, 32(6): 1010-1014.
LEI Hong, ZHANG Xinming, WANG Jiping. Heat Transfer Enhancement of Porous Foams and Analysis with Field Synergy Principle. Materials Reports, 2018, 32(6): 1010-1014.
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2018, Vol. 32 
