本文應用數值模擬方法探討管外不同幾何外型構造之凝結熱傳特性之分析。本研究熱傳裝置包括了水平圓管、波形圓管、橢圓管與超級橢圓管。本研究探討蒸汽流場中含有不可凝結氣體，且建模過程採用兩相流數值方法預測蒸汽中汽液界面剪力，蒸汽濃度分佈與溫度分佈。研究結果歸納出系統溫差、蒸汽流速、蒸汽濃度為影響冷凝管熱傳係數與液膜厚度之相關重要參數。根據研究結果顯示，不可凝結氣體的參雜會造成凝結液膜厚度、局部與平均熱通量顯著的下降；系統溫差的提升會增厚凝結液膜厚度與提高局部熱通量；蒸汽流速增加會提升局部熱通量並造成冷凝液膜變薄。此外，本研究亦探討管壁幾何變化對凝結熱傳的影響。研究中歸納出等表面積之水平橢圓管，因受到外部蒸汽勢流的影響，平均熱傳隨著橢圓離心率增加而下降，反之，高橢圓離心率的情況下，可減輕蒸汽濃度對平均熱傳的影響。本研究針對具波形表面的水平圓管方面，發現於降低波形振幅與增加波形數量時，提高系統溫差可使波形圓管之熱傳率高於光滑圓管。因此粗糙表面與高系統溫差可有效提升熱傳係數。而在超級橢圓管之自然對流凝結熱傳方面，在無表面張力的作用下平均熱傳隨著高橢圓次方參數n值大於1.3後而逐漸下降，且橢圓離心率的增加對平均熱傳具增強之作用。因此，在高橢圓次方參數n可加強橢圓離心率對平均熱傳的影響。

In this research, the film condensation heat transfer on various shapes and geometries of the cylinders has been investigated by the numerical simulation method. The heat transfer devices in this research include the horizontal circular tubes, the wavy surfaces of the circular tubes, the elliptical tubes, and the super elliptical tubes. Due to the fact that the non-condensable gases are infiltrated in the vapor flow, the two-phase numerical modeling are utilized for estimating the vapor-liquid interfacial shear stresses, the vapor concentrations, and the vapor temperatures. The results revealed that the system temperature difference, the vapor velocity, and the vapor concentration played an important role on the condensate film thickness and the local/average heat transfer. The infiltrates of the non-condensable gases will decrease the film thickness and the local/average heat flux. The system temperature difference is directly proportional to the film thickness and heat flux. Otherwise, the vapor velocity is directly proportional to the heat flux, but inversely proportional to the film thickness. Furthermore, for the dependence of the condensate heat transfer on various shapes and geometries of the cylinders, the results induced that the horizontal elliptical tubes based on the constant surface will decline the heat transfer with an increasing ellipticity under the influence of the uniform vapor flow. However, the increasing ellipticity reduces the effect of vapor concentration on the heat transfer. For the wavy surface of the circular tube, the heat transfer caused by the low wavy amplitude and an increasing wavy number parameter is larger than that of the smooth tube under on the high system temperature difference. This phenomenon reveals that the rough surface with low tube temperature increases the heat transfer efficiently. For the natural convection film condensation on the super-elliptical tube without surface tension, the average heat transfer gradually decreases as n greater than 1.3, and the increasing ellipticity enhances the average heat transfer. Thus, it was found that the ellipticity will affect the heat flux with an increasing order of super-ellipse parameter.

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