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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experiments on the transient heat transfer of minichannel heat sink under high heat flux density in an enclosed loop
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Experiments on the transient heat transfer of minichannel heat sink under high heat flux density in an enclosed loop

机译：封闭回路中高热通量密度下微通道散热器瞬态传热的实验

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摘要

The experiments are carried out to study the transient heat transfer characteristics of a minichannel heat sink under high heat flux density that varies from 150W/cm~2 to 200W/cm~2, in an enclosed loop. The heat flux is supplied by the ethyne flame. The average rate of the cooling water is from 1.00m/s to 1.86m/s. The temperature rise of the heated surface and the temperature rise of the cooling water are measured. The results show that the temperature rise of the heated top surface rises quickly at the startup period of heating, and then increases slowly. The variation of the top surface temperature is similar to the voltage in the RC circuit. The surface temperature is a function of thermal resistance and thermal capacity of the heat sink. The temperature of the cooling water at outlet also rises quickly at the startup period of heating, and then becomes stable. The temperature increases are related to the heat flux density and the rate of the cooling water. There is a time delay between the temperature rise of the inlet cooling water and the startup of heating. This delay is related to the length of the enclosed loop and the rate of the cooling water. The pressure drop across the heat sink decreases slightly with time at high heat flux since the water viscosity reduces with the increasing temperature.
机译：通过实验研究了密闭回路中小通道散热器在150W / cm〜2到200W / cm〜2的高热通量密度下的瞬态传热特性。热通量由乙炔火焰提供。冷却水的平均速率为1.00m / s至1.86m / s。测量被加热表面的温度升高和冷却水的温度升高。结果表明，被加热的顶表面的温度上升在加热的启动阶段迅速上升，然后缓慢上升。顶表面温度的变化类似于RC电路中的电压。表面温度是散热器的热阻和热容量的函数。在加热的启动阶段，出口处的冷却水温度也迅速升高，然后变得稳定。温度升高与热通量密度和冷却水速率有关。在入口冷却水的温度升高和开始加热之间存在时间延迟。该延迟与封闭回路的长度和冷却水的流量有关。由于水的粘度随着温度的升高而降低，因此在高热通量下，散热器上的压降会随时间略有下降。

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