Numerical investigations for optimizing a novel micro-channel sink with perforated baffles and perforated walls

摘要

A novel micro-channel sink with perforated baffles and perforated walls (MSPBPW) is proposed to ameliorate the bottom surface temperature of the heat sink. Firstly, the performance the MSPBPW are numerically studied. L_1 represents the width of the rectangular hole on the baffle, and L_2 represents the distance between the channel wall perforation and the center of the hole on the baffle. The results show that the heat transfer ability of MSPBPW with pressure drop penalty can be significantly improved, and the thermal performance evaluation criterion (PEC) value is always greater than unity. The substrate maximum temperature can be reduced by 17.8 K when introducing perforated baffles and punching holes on the channel walls into the conventional heat sink. Secondly, the effects of the width of the rectangular hole (L_1) and the distance (L_2) between the channel wall perforation and the center of the hole on the baffle on the cooling capacity of the MSPBPW are discussed numerically. Finally, the best parameters are achieved by single-objective optimization according to genetic algorithms. At the same Reynolds number (Re), both the Nusselt number and the friction coefficient decrease with the increase of L_1, while those increase with the increase of L_2, The data of the single-objective optimization are consistent with CFD results.