Abstract:Under different structural parameters, the flow and heat transfer characteristics of TF-MCHS are studied using numerical methods. The results show that the rib height () has the most significant effect on the total thermal resistance () and pressure drop () of TF-MCHS among structural parameters. As increases, of the microchannel decreases rapidly, but increases rapidly. To obtain the best parameter, a multi-objective optimization using Response Surface Methodology (RSM), Non-dominated Sorting Genetic Algorithm (NSGA-II), and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) was performed. According to the field synergy principle and performance evaluation criteria (), the overall performance of the microchannel before and after optimization was assessed. The results show that when is both 0.1858 K/W, the pumping power () of the optimized microchannel is 53.38% lower than that of the unoptimized microchannel, only 0.0062W. When is both 0.0132 W, of the optimized microchannel decreases by 13.04% compared to that of the unoptimized microchannel, only 0.16K/W. The of the TOPSIS optimal microchannel is higher than that of the unoptimized microchannel. At Re = 231, the increases from 1.163 to 1.253, an increase of 7.74%; and at Re = 631, the is 1.4515. The field synergy principle indicates that the velocity field and temperature field of the TOPSIS optimal microchannel have the best synergy effect (Fc=0.01889).
