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Characterization of working fluid in vertically mounted finned U-shape twin heat pipe for electronic cooling

机译:垂直安装的翅形U型双热管中用于电子冷却的工作流体的特性

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As part of the ongoing research on finned U-shape heat pipes for CPU cooling, the present work focuses on the characterization of working fluid in vertically oriented twin U-shape heat pipe, by taking into account the gravity of flow. Two-dimensional FE simulation is performed under natural and forced convection modes, by using ansys-flotran. The best heat input and coolant velocity for the simulations are determined experimentally, corresponding to the least thermal resistance. The wall temperatures at the evaporator, adiabatic and condenser sections, and the velocity and pressure distributions of vapor and liquid, are analyzed. The total heat input for minimum thermal resistance in both natural and forced convection is found to be 50 W, and the coolant velocity is 3 m/s. The predicted and experimental wall temperatures are found in excellent match. It is observed that for the present U-shape heat pipe configuration, the difference in evaporator and condenser temperatures is significantly small, resulting in enhanced heat transfer compared to the conventional heat pipes. The sintered copper wick has a small pore size, resulting in low wick permeability, leading to the generation of high capillary forces for anti-gravity applications.
机译:作为正在进行中的用于CPU冷却的翅片U形热管的研究的一部分,当前工作着重于通过考虑流的重力来表征垂直定向的双U形热管中的工作流体。通过使用ansys-flotran在自然和强制对流模式下执行二维有限元模拟。通过模拟确定最佳的热输入和冷却剂速度,对应于最小的热阻。分析了蒸发器,绝热和冷凝器部分的壁温,以及蒸汽和液体的速度和压力分布。发现自然和强制对流中最小热阻的总热量输入为50 W,冷却液速度为3 m / s。发现预测的和实验的壁温非常匹配。观察到,对于当前的U形热管构造,蒸发器和冷凝器温度的差异非常小,与传统的热管相比,导致传热增强。烧结的铜芯吸孔尺寸小,导致芯吸渗透率低,从而导致在反重力应用中产生高毛细力。

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