熱管(Heat Pipe)為近年來常被使用的散熱元件，它的原理為利用相變化的潛熱來快速帶走熱量，熱管在作動時分為加熱端、絕熱端及冷凝端三部份。加熱端使內部液體吸熱達到沸點溫度汽化，氣體往冷凝端擴散，把汽化的氣體凝結為液體，再藉由毛細現象將工作流體吸回加熱端一直循環。本研究係使用計算流體力學(CFD)套裝軟體來模擬熱管的做動情形，包含氣液相變化以及多孔性材料等現象。從商業上成本之考量，探討使用相同材料體積為前提之下，由兩個不同的角度出發。其一是在不同的水利直徑之下去改變熱管的形狀;另一則是增加熱管蒸汽腔體體積在相同的水利直徑之下去改變熱管的形狀。目的則是以基礎理論搭配數值方法建立實用的熱管分析模型，分析模型的完成，可提供電子業在散熱模組設計與評估的參考。

Heat sink components usually use heat pipe that achieved rapid cooling by the liquid-vapor phase change of work fluid in recent years. Heat pipe consists of three parts: (1) evaporator section, (2) adiabatic (transport) section and (3) condenser section. The work fluid achieved the boiling point in evaporator section when it absorbed heat. The resulting vapor pressure drives the vapor through the adiabatic section to the condenser, where the vapor condenses and releasing its latent heat of vaporization. Finally, the work fluid flowed back to evaporator section by the capillary repeatedly. We used CFD Package to simulate the dynamic situation of heat pipe that included liquid-vapor phase and porosity material in this research. Two different models that are based on the same material volume in business costs have been developed: one is at different hydraulic diameter, changing the shape of heat pipe. The other is at same hydraulic diameter, increasing the vapor chamber of heat pipe. The purpose of this study is to construct a practical analysis model for heat pipe. When the model is accomplished, it is helpful to the R&D works of the electronic cooling industries.

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