两种微型热管传热性能对比研究

Comparative Study on The Heat Transfer Performance of Two Types of Micro Heat Pipes

以波形脉动热管和微槽平板热管为研究对象,基于Mixture模型构建了其三维非稳态数学模型,并对模型可靠性进行了验证。采用该数学模型对比了两种微型热管在相同散热空间和散热热流密度情况下的热阻、平均壁面温度和蒸发段壁面温度均匀性。结果表明:相对于微槽平板热管,波形脉动热管热阻更低,传热性能更好;波形脉动热管蒸发段稳态平均壁面温度更低,且随着热流密度的增加该优势更加明显;波形脉动热管在空间尺度上蒸发段壁面温度均匀性更好,且这种优势在高热流密度情况下更突出,但这种均匀性在时间尺度上变化相对剧烈。

Taking the pulsating heat pipe with corrugated configuration and the microgrooved flat heat pipe as the research objects,a three-dimensional unsteady mathematical model was constructed based on the Mixture model,and the reliability of the model was verified.This mathematical model was used to compare the thermal resistance,average wall temperature and the uniformity of the evaporation section wall temperature of the two types of micro heat pipes under the same heat dissipation space and heat flux.The results show that,compared with the micro-grooved flat heat pipe,the pulsating heat pipe with corrugated configuration presents lower thermal resistance and better heat transfer performance;the steady-state average wall temperature of the evaporation section of the pulsating heat pipe with corrugated configuration is lower,and this advantage becomes more obvious as the heat flux increases;the pulsating heat pipe with corrugated configuration has better wall temperature uniformity in the evaporation section on the spatial scale,and this advantage is more prominent in the case of high heat flux,but this uniformity changes relatively drastically on the time scale.