菱形微通道圆盘热沉流动传热的数值模拟研究及优化

Numerical simulation rsearch and optimization of flow and heat transfer in diamond microchannel disk heat sink

采用CFD技术对菱形微通道以及平直微通道内流动传热进行数值模拟,获得微通道热沉及其内部流体的温度场、速度场和压力场,探究不同工况下的流动传热效果及强化传热机理,并基于场协同原理和[火积]耗散理论,对不同工况下微通道的流动传热效果进行优化分析。分析温度场和速度场的协同程度和热量传递过程的不可逆耗散程度,以微通道热沉温度水平及散热量为主要评价指标。研究结果表明,菱形微通道具有较好的传热效果,在层流变发热量条件下,发热量q=20 W时散热效果最佳,在层流变微通道高宽比条件下,高宽比α=0.5时热沉传热效果最好。

CFD technology is used to numerically simulate the flow heat transfer in rhombic microchannels and flat microchannels, to obtain the temperature, velocity and pressure fields of microchannel heat sink and its internal fluid, to investigate the flow heat transfer effect and its enhanced heat transfer mechanism under different working conditions, and to optimize the flow heat transfer effect of microchannels under different working conditions based on the principle of field synergy and entransy dissipation theory, to analyze the temperature and velocity fields and the irreversible dissipation of the heat transfer process. The results show that the diamond-shaped microchannel has better heat transfer effect, and the best heat dissipation effect is achieved under the condition of laminar rheological heat generation with heat generation q=20 W, and the best heat transfer effect is achieved under the condition of laminar rheological microchannel height-towidth ratio α=0.5 for heat sink.