Temperature uniformity analysis and multi-objective optimization of a small-scale variable density alternating obliquely truncated microchannel

The variable density distributed alternating slanted passages are employed in a small-scale micro-channel to improve the temperature uniformity. The 200 mu m width microchannel is experimentally and numerically inves-tigated under a heat flux of 100W/cm2. The Taguchi method is employed to analyze the influence rules and significance rankings of the geometric parameters on the thermal and hydraulic performances. The Latin hy-percube sampling is employed to sample in the design space and establish the surrogate model for average Nusselt number Nuavg, standard temperature deviation sigma and frictional coefficient f. Then the non-dominated sorting genetic algorithm-II is used to search the multi-objective optimal solution. The best compromise solu-tion selected by the technique for order preference by similarity to ideal solution and the single objective optimal solutions in the Pareto front are compared and discussed. The optimization results shows a significant improvement in the comprehensive performance. Its Nuavg is 21.26 % higher than the initial design, whilst its f and sigma are 8.33% and 66.13% lower than the initial design. It is demonstrated that reasonable structural pa-rameters and the optimization of variable density distribution can significantly improve the temperature uni-formity without sacrificing other performances. The results may help the development of the microchannel in the high heat flux heat dissipation applications.