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題名 | Temperature Distribution in a Porous Medium Subjected to Solar Radiative Incidence and Downward Flow: Convective Boundaries=輻射能與向下熱流在多孔媒介物內的溫度分佈情形 |
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作 者 | 洪春棋; 許綜升; 萬忠仁; 劉百川; | 書刊名 | 黃埔學報 |
卷期 | 51 民95.10 |
頁次 | 頁43-55 |
分類號 | 440.12 |
關鍵詞 | 多孔媒介物; 太陽池; 流體不穩定; 溫度分怖; Porous medium; Solar pond; Fluid instability; Temperature distribution notation; |
語文 | 英文(English) |
中文摘要 | 溫度分怖為流體穩定分析的必備知識,本文對水平層流體,內層填滿飽和多孔媒介物,接受外來太陽能的輻射,決定其溫度分怖的輪廓,並研究其熱邊界條件Biotnumber,內、外Rayleigh值,Pec1et值,光透深度與表面反射對溫度分怖的影響。 1988年,Hadim and Burmeister[l]研究常溫,無表面反射的溫度分怖,本文研究以能量方程主控無限水平層的流體,在飽和多孔媒介物內,對外來太陽能以解析法分析其溫度分佈情形,因包含邊界的對流,不但更接近真實,且溫度分怖的輪廓,必更精確。 |
英文摘要 | The knowledge of steady-state temperature distribution is known a priori for natural convection stability analysis. The present study determines the temperature profiles in an infinite horizontal layer of fluid filled with saturated porous medium confined between two convective surfaces subjected to external radiative incidence and imposed downward convection. The investigation concentrates on the influences of the thermal boundary condition (Biot number), internal and external Rayleigh numbers, Peelet number, optical thickness, and surface reflectivities. The implications of these factors on fluid stability are addressed in detail. |
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