本文旨在探討傳送飽和水蒸汽之變溫內管與其環型鰭片在不同接觸壓力之熱傳遞與熱應力問題。主要相關變量包括鰭片與內管之干涉量、鰭片材質以及內外徑比，以求取在不同變量下溫度與熱應力分布，及所帶來的超出設計上限之可能破壞，確認系統能在安全範疇下運作。
首先考慮無熱阻情形下並給予內管壁一隨時間變化之溫度邊界條件與該溫度下之飽和水蒸汽壓，求解得兩介面之接觸壓力，接者利用Yovanovich經驗式換算出接觸熱導，再接觸熱導作為鰭片之邊界條件求解其溫度分布曲線，並利用溫度場求得熱應力分布曲線，包含徑向應力與切向應力。文中探討不同干涉量及不同內外徑比對於鰭片之溫度分布、介面溫差、熱應力分布之影響，以及穩態時之鰭片熱傳效率與熱傳量之關係。
研究結果得知，接觸壓力影響接觸熱導，而接觸熱導影響鰭片熱傳效率。又接觸面上的溫差會隨著接觸壓增大而變小，干涉量可有效地縮小溫度差距且應力場大小會隨著干涉量、內外徑比與其本身材料熱膨脹率而變化。干涉量越大接觸面附近周向應力越小，而徑向應力反而會越大。又內外徑比越大對於周向與徑向之應力都會越大。

The purpose of this paper is to investigate the heat transfer and thermal stress of the annular fin with time-dependent temperature of the inner tube and different contact pressures between the fin and inner tube. The main relevant variables include the interference bet-ween the fin and the inner tube, fin material, and the ratio of the inner and outer diameters of the fin. In order to obtain the temperature and thermal stress distribution under different variables and the possible damage beyond the designing limit.
The research results show that the contact pressure affects the thermal contact conductivity, and the contact thermal conductivity affects the heat transfer efficiency of the fin. The temperature difference on the contact surface becomes smaller as the contact pressure increases. The amount of interference can effectively reduce the temperature difference and the magnitude of the stress field changes with the amount of interference, the ratio of the inner and outer diameters of the fin, and the thermal expansion rate of the material itself. The larger the amount of interference, the smaller the circumferential stress near the contact surface, and the greater the radial stress. Furthermore, the larger the ratio of the inner and outer diameters of the fin, the greater the stress in the circumferential stress and the radial stress.

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