结构形式对双层微通道热沉传热性能的影响

设计一种双层微通道热沉，即热沉上下层通道结构相异B（上层为矩形微通道，下层为复杂结构微通道），旨在降低压降的同时保持良好的换热性能，并与上下层通道均为复杂结构微通道的热沉A作对比。用数值方法研究了顺流和逆流时、不同通道结构（PA、PB、CA、CB）对其传热性能的影响，并用场协同原理分析流场与温度场的协同关系对传热的影响。结果表明:当0

Effect of structure on heat transfer performance in double-layered microchannel heat sinks

A double-layered microchannel heat sink with difference structure in each layer (B) was designed, and compared with structure A (the same complex structure in each layer) to reduce pressure drop and main good heat transfer performance. The effects of parallel flow, counter flow and different structures (PA,PB,CA,CB) on heat transfer performance were studied numerically. Moreover, the effect of synergy relationship between flow field and temperature field on heat transfer was analyzed by field synergy principle. The results showed that the average bottom temperature of parallel flow PA and PB was lower than that of counter flow CA and CB when Reynolds number ranged from 0 to 140. However, the average bottom temperature from low to high followed by PB, CB, PA and CA(when Reynolds number ranged from 140 to 250). From it, structure PB was adopted if there were high requirements for bottom temperature of microelectronics chips.From the view point of comprehensive heat transfer performance, the heat transfer performance and synergy angle of PB was better and smaller than others, indicating that it could improve the synergy relationship between flow field and temperature field obviously.