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研究生:陳宏彰
研究生(外文):H. C. Chen
論文名稱:跳躍式壁溫水平圓管內之熱輻射及對流效應
論文名稱(外文):Combined Radiation and Convection in the Horizontal Circular Tube with Step-change Wall Temperature
指導教授:王振源王振源引用關係
指導教授(外文):C. Y. Wang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:航空太空工程學系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:80
中文關鍵詞:水平圓管熱輻射熱對流
外文關鍵詞:TubeRadiationConvection
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  • 被引用被引用:0
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  • 下載下載:55
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本文主要目的為用數值方法計算跳躍式壁溫水平圓管的熱流現象,在入口時流場為完全發展層流,管前半端為低溫區,經過跳躍點後進入高溫,並討論結合自然對流及熱輻射效應時對管內熱流場的影響。吾人用SIMPLER 來解統御方程式。
吾人以三種模式來處理熱輻射源項,其中考慮氣體之間及管壁對氣體的熱輻射效應為完整熱輻射模式,假設薄光學厚度則只考慮管壁對氣體的熱輻射效應,只考慮管壁徑向的熱輻射效應為徑向熱輻射模式 。我們選擇用來測試的氣體為水蒸氣及一氧化碳,此兩種氣體在高溫時輻射效應不可忽視。
我們發現自然對流效應會造成圓管內包括溫度及速度的劇烈變動,破壞其對稱性,而熱輻射效應則使得流場溫度快速且均勻的上升,同時減低自然對流效應的強度。

The study for laminar mixed convection combined with radiation in the thermal entrance region of pipe flow is important in any industrial applications requiring the prediction of short-tube heat transfer performance.
This thesis presents an analytical procedure for simultaneous convective and radiative heat transfer with a fully developed laminar flow in a pipe. The fluid is treated as a gray,absobing and emitting medium.
Three radiation models have been used to investigate the radiative transfer.The complete radiation model,not only the emission and absorption between thegas and the tube wall.The optically thin radiation model neglects the radiative heat exchanges among gas.In the other radial radiation model,the radiative intensities are regarded as a constant intensity with a wall.
When fluids are heated or cooled in horizontal tubes, the resulting temperature difference gives rise to density variation.So, the naturnal convective heat transfer is also important in pipe flow.

第一章 導論
1.1 引言 1
1.2 文獻回顧 2
1.3 本文概述 3
第二章 數學與物理模式
2.1 統御方程式 4
2.2 氣體熱性質 6
2.3 熱輻射性 7
2.4 熱輻射模式 8
2.5 邊界條件 10
第三章 數值方法
3.1 SIMPLE程式 11
3.2 管中心邊界數值上的處理 14
3.3 熱輻射源項數值上的計算 15
第四章 結果與討論
4.1 不同熱輻射模式的探討 16
4.2 入口Re的影響 18
4.3 不同氣體的比較 20
4.4 Ra的影響 20
4.5 光學厚度的影響 21
第五章 結論 22
參考文獻 23

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Transfer, Vol. 104, pp. 153-159, 1982.
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