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題名 | 實驗與數值分析法探討部份水填充於水平圓管之暫態熱對流=Experimental and Numerical Analysis of Transient Thermal Convection in a Horizontal Circular Container Partially Filled with Water |
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作者 | 林宜弘; 何清政; | 書刊名 | 技術學刊 |
卷期 | 12:1 1997.03[民86.03] |
頁次 | 頁79-88 |
分類號 | 335.21 |
關鍵詞 | 暫態熱對流; 表面張力; 部份水; 圓管; Transient thermal convection; Surface tension; Partially filled; Tube; |
語文 | 中文(Chinese) |
中文摘要 | 本文採實驗並配合數值分析法探討部份水填充於水平圓管內暫態熱對流問題。實 驗方法則採用雷射全像干涉術觀察圓管內水的溫度場,並採用雷射光學陰影法直接量測水所 覆蓋圓管壁的局部熱傳係數,而求出平均熱傳係數。數值分析先採簡單徑向格點轉換來切割 不規則計算領域,再採有限差分法來解空氣與水的流場與溫度值及計算圓管壁熱傳係數、計 算結果與實驗結果互相比較,並探討系統參數對整個暫態熱對流的影響情形,系統參數包括 :浮力強度、表面張力、空氣及水介面的位置等參數。 |
英文摘要 | This paper presents a combined numerical and experimental investigation on the unsteady laminar natural convection flow of air/water in a horizontal ci rcular container. A real-time holographic interferometry was employed to map the temperature distribution, and a laser shadowgraph system was used to measure the local heat transfer coefficient along the heated cylinder. Numerical solutions were obtained by means of a finite difference method. A radial coordinate transofrmation was adopted to deal with the irregular physical domains occupied by air and water, respectively. the present study focuses on the comparision of the experimental and numerical results and explores the influences of the pertinent paramenters on the problem under consideration, which include the Rayleigh number, Maragoni number, and the position of the interface between air and water. |
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