分流式微通道热沉强化传热性能数值分析

A Numerical Analysis of the Enhanced Performance in Heat Transfer of a Manifold Micro-Channel Heat Sink

摘要: 分流式微通道热沉MMHS与一般的微通道热沉MHS相比具有更强的传热能力及散热均匀性, 在电子芯片等高发热设备冷却方面具有优势。该文通过数值方法模拟了MHS与MMHS单个肋通道内的换热过程, 对比分析了两者在总体换热能力及散热均匀性方面的差异。结果表明, 入口流量在0.57~2.87 kg/h范围时, MMHS微通道平均换热系数比MHS提高1倍以上, 同时散热均匀性提高52%以上; MMHS具有的多进口多出口的几何结构和流动过程是MMHS综合换热性能大幅提升的主要原因。

Abstract: Manifold micro-channel heat sink (MMHS) has a better heat transfer capacity and uniformity compared with the conventional micro-channel heat sink (MHS), showing a great potential in cooling equipments with high heat generation rate like electronic chips.A numerical simulation work was carried out on heat transfer process in a single unit of MHS and MMHS.For the mass flow rate covering 0.57~2.87 kg/h, averaged heat transfer coefficient of the MMHS is enhanced over 100% and the heat dissipation uniformity is increased 52% compared with the MHS.The multiple inlets and outlets in the MMHS contribute a lot to the improvement of heat transfer performance.