Analytical design of effective thermal conductivity for fluid-saturated prismatic cellular metal honeycombs

Theoretical and Applied Mechanics Letters

Wenbin Wang¹  Qiancheng Zhang¹  Xiaohu Yang¹  Xiangfei Wang¹  Bin Han¹  Tianjian Lu¹ 

[1] MOE Key Laboratory for Multifunctional Materials and Structures, Xi’an Jiaotong University, Xi’an 710049, China;

关键词: Effective thermal conductivity;    Prismatic cellular metal honeycomb;    Ligament heat conduction efficiency;    Analytical design;    Equivalent interaction angle;   

DOI  :  10.1016/j.taml.2016.01.003

来源: DOAJ

【 摘 要 】

A comparative optimal design of fluid-saturated prismatic cellular metal honeycombs (PCMHs) having different cell shapes is presented for thermal management applications. Based on the periodic topology of each PCMH, a unit cell (UC) for thermal transport analysis was selected to calculate its effective thermal conductivity. Without introducing any empirical coefficient, we modified and extended the analytical model of parallel–series thermal–electric network to a wider porosity range (0.7∼0.98) by considering the effects of two-dimensional local heat conduction in solid ligaments inside each UC. Good agreement was achieved between analytical predictions and numerical simulations based on the method of finite volume. The concept of ligament heat conduction efficiency (LTCE) was proposed to physically explain the mechanisms underlying the effects of ligament configuration on effective thermal conductivity (ETC). Based upon the proposed theory, a construct strategy was developed for designing the ETC by altering the equivalent interaction angle with the direction of heat flow: relatively small average interaction angle for thermal conduction and relatively large one for thermal insulation.

【 授权许可】

Unknown