熱管具有高傳熱量與熱響應迅速以及構造簡單不需額外提供動力等特性，可稱之為熱的超導體。本論文已建立三維熱管之流場數值分析模式，並完成三維熱管之氣相流場數值模擬程式之建立，並以此程式分析不同參數組合對熱管氣相流場的影響，探討的參數包括：受熱面積的大小、作動溫度的高低、總熱通量的多寡。由數值模擬的結果可知，減少總受熱面積的大小將使的蒸發端每單位面積的入口流量增加，同時受熱的位置亦是直接影響內部流場性質分布的關鍵，但只要質流率一定，受熱面積的位置與大小對絕熱段的最大速度影響不大。而作動溫度的高低將影響流場的飽和密度，如在質流率一定的條件下，作動溫度愈高則流場飽和密度愈大且絕熱段的最大速度愈小。另外增加總熱通量將使蒸發端入口流速與絕熱段的最大速度亦同步加大。

　　The heat pipe is a simple and power-free device that is characterized by a high heat transfer capacity and a short thermal response time. In the present thesis, the physical models for the flow analysis of a heat pipe have been formulated, and a newly developed computer simulation code has developed for the analysis of the three-dimensional gas-phase flowfield. The effects of various combination of parameters on the gas-phase flowfield of heat pipe have been explored. The parameters investigated include: heating area, working temperature, and total heat flux. The calculated results indicate that the decrease of total heating area leads to the increase of the mass flux in the evaporated region, and the heating position is also the key point on the distribution of flow properties. If the total mass flow rate is fixed, the effect of the heating position on the maximum velocity in the adiabatic region is insignificant. Under the assumption of saturated pressure in the gas flow, the increase of working temperature leads to the increase of density in the gas flow, resulting in the decrease of maximum velocity in the adiabatic region. The increase of total heat flux leads to the increase of velocity of inflow and maximum velocity in the adiabatic region.

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