拓扑优化相变热沉在不同重力场的性能

To enhance the performance of phase change heat sink based heat sinks, the topology optimization of a sorbitol/aluminum phase change heat sink based heat sink is carried out using solid isotropic material with penalization (SIMP) method. Numerical investigations on phase change heat sink with topologically optimized fins (I) and straight fins (II) under the constant gravity (0~20g) and periodic gravity are presented. Dimensionless numbers are used to compare the thermal performance of the two heat sinks. The results show that heat sink I performs better than heat sink II. Under the same gravity environment with 80 ℃ as the goal, the temperature control time of the heat sink I is extended by up to 26.8% on average. Under the microgravity and low gravity, heat conduction dominates the heat sinks, of which the thermal performance is slightly inferior to that under conventional gravity. The natural convection of the liquid PCM driven by supergravity significantly enhances the heat transfer. For heat sink I, the temperature control time of 10g is 8.94% higher than that of conventional gravity, and the periodic gravity has an inhibitory effect at the same Ra^*. Research findings provide guidance for detailing the design of aircraft phase change heat sinks .