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

陳志安(Chih-An Chen)

指導教授 ： 曾重仁

國立中央大學/工學院/機械工程學系/碩士(2008年)

摘要

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。

關鍵字

超臨界二氧化碳 ； 多孔材料 ； 數值模擬

並列摘要

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

並列關鍵字

supercritical carbon dioxide ； numerical analysis ； porous media

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