本研究使用美國 Los Alamos 國家實驗室所發展之KIVA-3電腦模擬程式，建立對熱管內部蒸氣流場之三維數值模擬能力。本研究由計算結果之速度分布、壓力分布、及蒸氣密度分布等現象觀察內部流場的變化，並藉由不同幾何形狀的改變，熱通量的不同等操作因素，分別比較其差異性。分析的結果顯示，在圓形或方形熱管的內部蒸氣流場中，絕熱部有最大流速的現象發生。此一結果是由於在絕熱部的管壁上產生了邊界層的效應，使得中央管流的截面積縮小，而造成了加速的現象。而圓管和方管的最大流速，也跟截面積的大小成一反比。在壓力的分布上，也符合速度流場的分布，從一加熱端的高壓至凝結端的低壓，呈一完整的分布。在密度的分布上，大致與壓力的分布相同。

This study aims to build the capability of simulation on the 3-D, vapor flow of heat pipes with different shapes inside using modified KIVA-3 code. Numerical predictions for the distributions of velocity field , pressure , and vapor density are conducted to identify the variation of the vapor flow. With different shapes of heat pipes and different heat flux into the heat pipes . The analysis reveals that whether the heat pipes cylindrical or rectangular , the maximum velocity is exhibited at the adiabatic zone in the center of the heat pipe. The growth of the boundary layer is the main reason to cause the flow acceleration in the adiabatic zone, where the central cross area is much narrow than those at the entrance and exit . The maximum velocity in cylindrical heat pipes or rectangular heat pipes is an inverse ratio of the cross area. The pressure drops from the evaporation zone to condensation zone . The distribution of vapor density also exhibits the same trend.

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