數值模擬超臨界二氧化碳在多孔材圓管中之熱流現象

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姓名

陳志安(Chih-An Chen) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

數值模擬超臨界二氧化碳在多孔材圓管中之熱流現象
(Numerical simulation of heat transfer of supercritical carbon dioxide within a porous medium tube)

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摘要(中)

本文將以數值方法來模擬超臨界二氧化碳在多孔材圓管中的熱流現象。在模擬多孔材料時，採用Brinkman-Forchheimer-extended-Darcy Model來描述流體在多孔材料中受到的力。忽略重力與黏滯消散(Viscous dissipation)、熱輻射的影響，並假設流場為層流。三維的幾何外型透過軸對稱的條件簡化成二維問題。在多孔材料下的雷諾數、達西數、孔隙率、固體與液體之熱傳導係數比值等對於流場與熱傳特性之影響為本研究之討論重點。

摘要(英)

Numerical simulation heat transfer of supercritical carbon dioxide in tube filled with porous media is considered in this work. The flow porous media is modeled using Brinkman-Forchheimer-extended-Darcy model. The effects of gravity and viscous dissipation are neglected, and assume as laminar flow. Three-dimension geometry is simplified to two-dimension, using axisymmetric condition. Variation of Nusselt number, which is affected by Reynolds number, Darcy number, Porosity, and thermal conductivity ratio of solid to fluid, will be discussed in this work

關鍵字(中)

★ 超臨界二氧化碳
★ 多孔材料
★ 數值模擬

關鍵字(英)

★ supercritical carbon dioxide
★ numerical analysis
★ porous media

論文目次

摘要........................................................................................................................I
ABSTRACT........................................................................................................ III
誌謝...................................................................................................................... V
目錄....................................................................................................................VII
圖目錄.................................................................................................................IX
表目錄............................................................................................................... XV
符號說明.........................................................................................................XVII
第一章緒論...................................................................................................... 1
1-1 研究動機.......................................................................................... 1
1-2 超臨界流體簡介.............................................................................. 2
1-3 超臨界二氧化碳簡介...................................................................... 7
1-4 文獻回顧.......................................................................................... 9
1-5 研究主題........................................................................................ 15
第二章理論分析............................................................................................ 21
2-1 幾何模型........................................................................................ 21
2-2 統御方程式.................................................................................... 22
2-3 邊界條件與初始條件.................................................................... 26
2-4 超臨界二氧化碳的物理性質........................................................27
第三章數值方法與驗證................................................................................29
3-1 數值方法........................................................................................29
3-2 程式驗證........................................................................................34
第四章結果與討論........................................................................................41
4-1 黏滯消散效應(VISCOUS DISSIPATION) ...........................................41
4-2 速度與溫度曲線............................................................................43
4-3 DARCY NUMBER 之影響.....................................................................45
4-4 孔隙率之影響................................................................................47
4-5 熱傳導係數比值之影響................................................................48
4-6 入口REYNOLDS NUMBER 之影響...................................................50
4-7 入口溫度與壁面熱通量之影響....................................................51
4-8 不同操作壓力之影響....................................................................52
4-9 超臨界二氧化碳在多孔材料中之經驗公式................................54
第五章結論與建議........................................................................................95
5-1 結論................................................................................................95
5-2 未來研究方向與建議....................................................................96
參考文獻............................................................................................................. 97

參考文獻

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指導教授

曾重仁(Chung-jen Tseng)

審核日期

2008-7-20

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