仿生鱼鳞微通道对流传热数值模拟以及结构参数优化  

Numerical Simulation and Structural Parameter Optimization of Convective Heat Transfer in Microchannel of Biomimetic Fish Scale

作　　者：李娟[1] 姚浩 朱章钰 石雷 LI Juan;YAO Hao;ZHU Zhangyu;SHI Lei(College of Mechanical and Electronic Engineering,Nanjing Forestry University,Nanjing,China,210037;School of Energy Science and Engineering,Central South University,Changsha,China,410083)

机构地区：[1]南京林业大学机械电子工程学院,江苏南京210037 [2]中南大学能源科学与工程学院,湖南长沙410083

出　　处：《热能动力工程》2024年第9期144-154,共11页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金(51506098)。

摘　　要：建立了仿生鱼鳞结构微通道三维物理模型,通过数值模拟微通道内对流传热过程,获得了鱼鳞结构参数对平均摩擦系数、平均努塞尔数和综合传热性能因子的影响规律,并采用均匀实验设计方法对结构参数进行优化得到了仿生微通道的目标值热阻和泵功之间的拟合多元二次回归方程。研究表明:仿生鱼鳞结构微通道的平均摩擦系数与平均努塞尔数均大于光滑矩形微通道;仿生鱼鳞结构产生的阻力更小;鱼鳞仿生结构微通道的综合性能因子最大为1.55(雷诺数为1300时),综合传热性能明显优于矩形光滑微通道;鱼鳞结构的相对高度hs,1/H和相对宽度bs,1/W对综合传热性能影响较大;仿生鱼鳞微通道的热阻和泵功回归方程的拟合优度R2分别为0.9576和0.9905,拟合方程可信度高。A three-dimensional physical model of the biomimetic fish-scale microchannel was established.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 simulation 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 regression 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 biomimetic microchannel is 1.55(Re=1300),and the comprehensive heat transfer performance is obviously better than that of the smooth rectangular microchannel.The relative height h_(s,1)/H and the relative width b_(s,1)/W of fish-scale structure have great influence on the comprehensive heat transfer performance.The goodness of fit R~2 of the thermal resistance and pumping power regression equations biomimetic fish-scale microchannel are 0.9576 and 0.9905,respectively,indicating high reliability of the fitting equations.

关 键 词：鱼鳞仿生 传热 减阻 微通道 均匀实验方法 

分 类 号：TK124[动力工程及工程热物理—工程热物理]