Numerical Simulation and Structural Parameter Optimization of Convective Heat Transfer in Microchannel of Biomimetic Fish Scale
A three-dimensional physical model of the biomimetic fish-scale microchannel was estab-lished.The effects of the fish-scale structural parameters on the average friction coefficient,the average Nusselt number and the comprehensive heat transfer performance factors were obtained by numerical sim-ulation of the convective heat transfer process in the microchannel,and the uniform experimental design method was used to optimize the structural parameters and obtain the fitting multivariate quadratic regres-sion equations between the target thermal resistance and pumping power of biomimetic microchannel.The results show that the average friction coefficient and the average Nusselt number of the biomimetic fish-scale microchannel are larger than that of the smooth rectangular microchannel.The biomimetic fish-scale structune produces less resistance.The maximum comprehensive performance factor of the fish-scale bio-mimetic microchannel is 1.55(Re=1 300),and the comprehensive heat transfer performance is obvi-ously better than that of the smooth rectangular microchannel.The relative height hs,1/H and the relative width bs,1/W of fish-scale structure have great influence on the comprehensive heat transfer performance.The goodness of fit R2 of the thermal resistance and pumping power regression equations biomimetic fish-scale microchannel are 0.957 6 and 0.990 5,respectively,indicating high reliability of the fitting equations.
万方数据
维普
