Study of microchannel heat transfer characteristics based on topology optimization

Based on the dual-objective topology optimization method, four microchannel configurations with differing inlet and outlet arrangements are studied in this paper. The influences of the aspect ratio, weight coefficient and Reynolds number on the optimized design variable, temperature and pressure fields have been investigated. Comparative analysis of heat transfer characteristics in microchannels with different structures is implemented using the entransy dissipation theory and the field synergy principle. The results show that the maximum temperature demonstrates higher sensitivity to aspect ratio and weighting factor variations in DMC and 3SMC configurations compared to Reynolds number effects. Pressure drop characteristics exhibit that the weighting factor has the most significant impact on 2SMC, while aspect ratio determines 3SMC behavior. In addition, DMC achieves the highest entransy dissipation and the best heat transfer efficiency, while CMC presents the best synergy between velocity and temperature fields, superior flow characteristics and optimal thermal performance.