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

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• 作者：Mohamed H.A. Elnaggar ; M.Z. Abdullah ; M. Abdul Mujeebu
• 关键词：U-shape heat pipe ; Thermal resistance ; Heat input ; Coolant velocity ; Wall temperature ; Liquid pressure drop
• 刊名：Energy Conversion and Management
• 出版年：2012
• 出版时间：October, 2012
• 年：2012
• 卷：62
• 期：Complete
• 页码：31-39
• 全文大小：1352 K

文摘

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.