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首页> 外文期刊>International Journal of Heat and Mass Transfer >A quasi-3D analysis of the thermal performance of a flat heat pipe
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A quasi-3D analysis of the thermal performance of a flat heat pipe

机译：扁平热管热性能的准3D分析

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摘要

The thermal performance of a flat heat pipe thermal spreader has been described by a quasi-3D mathematical model and numerically modeled. An explicit finite volume method with under-relaxation was used for computations in the vapor phase. This was combined with a relatively small time step for the analysis. The physical problem consisted of an evaporator surface that was transiently heated non-uniformly for a short period of time and the heat source then removed. Then the system was cooled by natural convection and radiative heat transfer at the condenser region. The transient temperature distributions at the front and back of the heat spreader were obtained for different times during the transient period. The velocity distribution in the vapor core was also obtained. Due to the effect of phase change at the evaporator and condenser sides, a significant amount of energy is found to be absorbed and partially released during the transient heating and cooling processes. The numerical results indicate that advection and the high thermal diffusivity of the vapor phase accelerate the propagation of the temperature distribution in the vapor core, making it uniform during this process. The condenser temperature distribution was almost uniform at the end of the transient heating process. The transient temperature distribution on a solid aluminum plate was compared with the flat heat pipe results and indicated that the flat heat pipe successfully spread the heat uniformly at the condenser side of the structure.
机译：扁平热管散热器的热性能已通过准3D数学模型进行了描述并进行了数值建模。在气相中使用了显式有限体积松弛法来进行计算。这与相对较小的时间步长结合在一起进行分析。物理问题包括蒸发器表面，该表面在短时间内被不均匀地瞬时加热，然后将热源移除。然后通过冷凝器区域的自然对流和辐射热传递将系统冷却。在过渡期间的不同时间获得了散热器前部和后部的过渡温度分布。还获得了蒸气芯中的速度分布。由于蒸发器和冷凝器侧的相变效应，在瞬态加热和冷却过程中，大量能量被吸收并部分释放。数值结果表明，气相的对流和高热扩散率加速了气相中温度分布的传播，使其在此过程中均匀。在瞬态加热过程结束时，冷凝器温度分布几乎均匀。将实心铝板上的瞬时温度分布与扁平热管结果进行了比较，表明扁平热管成功地将热量均匀地散布在结构的冷凝器侧。

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