標題: Evaporation of water film in an enclosure filled with a porous medium
作者: Fu, WS
Ke, WW
機械工程學系
Department of Mechanical Engineering
關鍵字: evaporation;porous medium;latent heat;sensible heat
公開日期: 1-May-1999
摘要: A double diffusive natural convection in an enclosure filled with a porous medium is investigated numerically. To enhance the heat transfer rate of a heat wall, the heat wall is wetted with a thin water film, then sensible and latent heat transfer occur simultaneously. The Darcy-Brinkman-Forchheimer model is used and the factors of heat flux, porosity and diameter of bead are taken into consideration. The SIMPLEC method with iterative processes is adopted to solve the governing equations. The results show that the effect of evaporation on the heat transfer rate is apparent, and the latent heat transfer plays an important role in the high Darcy-Rayleigh number situations. The averaged Nusselt number <(Nu)over bar> is approximately 2.5 when Ra*<4. In the range of 4<Ra*<4469, the relationship of the averaged Nusselt number with the Darcy-Rayleigh number is linear in logarithmic scale.
URI: http://hdl.handle.net/11536/31362
ISSN: 0253-3839
期刊: JOURNAL OF THE CHINESE INSTITUTE OF ENGINEERS
Volume: 22
Issue: 3
起始頁: 325
結束頁: 339
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