Simulated Analysis of Thermal Conductivity of Porous Metal Foams with 2-D Voronoi Model
ZHANG Xinming1, CHEN Danyang1, WANG Hua2
1 Key Laboratory of Low-grade Energy Utilization Technologies and Systems of Ministry of Education, Chongqing University, Chongqing 400030; 2 China CMCU Engineering Corporation, Chongqing 400041
Abstract: Porous metal foams is a new kind of functional material with low density, high mechanical strength, high thermal conductivity and other excellent properties. Porous metal foam has a wide application prospect and has been widely concerned and studied. The effective thermal conductivity (k*) of porous material is related to the pore structure. Only the porosity (ε) is not enough to describe the pore structure of the real material. Based on 2-D Voronoi model in this paper, the randomness (S) and porosity of models were defined to describe the pore structure parameters. By adjusting the deviation factor (α) and edge width coefficient (β) of the model to change the range of randomness and porosity. The influence of the randomness and porosity on the effective thermal conductivity of the model was analyzed,which showed that the randomness and porosity affect the effective thermal conductivity. Results showed that randomness increasing leads to effective thermal conductivity decreasing. From the simulations results of random models, it is pointed that the relative effective thermal conductivity of porous metal foam material can be expressed as power function of porosity and randomness.
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2017, Vol. 31 
