Effects of thermal radiation on natural convection heat and moisture transfer in rectangular enclosures partially filled with hygroscopic porous medium

doi:10.11949/j.issn.0438-1157.20150267

CIESC Journal ›› 2015, Vol. 66 ›› Issue (S1): 130-137.DOI: 10.11949/j.issn.0438-1157.20150267

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Effects of thermal radiation on natural convection heat and moisture transfer in rectangular enclosures partially filled with hygroscopic porous medium

WANG Yuancheng^1,2, YANG Kaimin¹, YANG Jun¹

1 College of Thermal Energy Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China;
2 Key Laboratory of Renewable Energy Utilization Technologies in Buildings of the National Education Ministry, Jinan 250101, Shandong, China

Received:2015-03-05 Revised:2015-03-15 Online:2015-06-30 Published:2015-06-30
Supported by:
supported by the National Natural Science Foundation of China (51276102).

表面辐射对部分填充吸湿性多孔介质的封闭腔体内热湿耦合传递的影响

王远成^1,2, 杨开敏¹, 杨君¹

1 山东建筑大学热能工程学院, 山东济南 250101;
2 教育部可再生能源建筑利用技术实验室, 山东济南 250101

通讯作者: 王远成
基金资助:
国家自然科学基金项目(51276102)。

Abstract

Abstract:

This paper deals with the effects of thermal radiation on natural convection heat and moisture transfer in rectangular enclosures partially filled with hygroscopic porous medium. The governing equations for the momentum, heat and moisture transfer were solved by the finite element method. The radiative heat transfer is calculated by making use of the radiosity of the surfaces that assumed to be grey. Comparisons with experimental and numerical results in the literature have been carried out. Effects of thermal radiation, Rayleigh number, Darcy number and a ratio, R_k, of thermal conductivity on natural convection, heat and moisture transfer in both free fluid and hygroscopic porous medium were analysed. It was found that the surface thermal radiation significantly alters the distribution of the temperature in rectangular enclosures and moisture content of hygroscopic porous medium even if the given emissivity is quite small, but there are no remarkable temperature and moisture content changes with the increase of emissivity from 0.5 to 1.0. The mean temperature at the interface and the moisture content in hygroscopic porous medium decrease with the increase of Ra. The Nu_c on the side walls in the free flow and porous medium regions increase with the increase of Ra. The temperature and moisture content distributions change little in porous medium during heat and moisture content transfer with the increase of R_k while the mean convective Nusselt number on the side walls of rectangular enclosures changes very little in a range of given Da and R_k.

Key words: surface thermal radiation, natural convection, heat and moisture transfer, hygroscopic porous medium, enclosure

摘要：

根据多孔介质热质传递原理, 基于有限元的方法数值分析了具有表面热辐射的部分填充吸湿性多孔介质的封闭腔体内部自然对流流动及热湿耦合传递过程, 探讨了表面发射率、Rayleigh数和Darcy数等参数对封闭腔体内部自然对流流动及热湿耦合传递过程的影响, 研究结果表明, 壁面热辐射的作用可以提高多孔介质内部的温度, 而且随着表面发射率的增大, 多孔介质内部的水分逐步向其右上角迁移和聚集。另外, Darcy数、多孔介质与空气的热导率比对方腔内部多孔介质的热量传递和水分迁移影响较小。

关键词: 表面热辐射, 自然对流, 热湿传递, 吸湿性多孔介质, 封闭腔体

CLC Number:

TK124

WANG Yuancheng, YANG Kaimin, YANG Jun. Effects of thermal radiation on natural convection heat and moisture transfer in rectangular enclosures partially filled with hygroscopic porous medium[J]. CIESC Journal, 2015, 66(S1): 130-137.

王远成, 杨开敏, 杨君. 表面辐射对部分填充吸湿性多孔介质的封闭腔体内热湿耦合传递的影响[J]. 化工学报, 2015, 66(S1): 130-137.

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Effects of thermal radiation on natural convection heat and moisture transfer in rectangular enclosures partially filled with hygroscopic porous medium

表面辐射对部分填充吸湿性多孔介质的封闭腔体内热湿耦合传递的影响

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