Fluid flow and heat mass transfer in membrane parallel-plates channels used for liquid desiccant air dehumidification

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• 作者：Si-Min Huang^a ; Li-Zhi Zhang^a ; ^b ; ^{Lzzhang@scut.edu.cn} ; Kai Tang^a ; Li-Xia Pei^a
• 关键词：Heat transfer ; Mass transfer ; Membrane parallel-plates channels ; Liquid desiccant ; Air dehumidification ; Naturally formed boundary conditions
• 刊名：International Journal of Heat and Mass Transfer
• 出版年：2012
• 期刊代码：42_00179310
• 类别：ce
• 出版时间：April, 2012
• 卷：55
• 期：9-10
• 页码：2571-2580
• 文件大小：536 K

摘要

Fluid flow and convective heat mass transfer in membrane-formed parallel-plates channels are investigated. The membrane-formed channels are used for liquid desiccant air dehumidification. The liquid desiccant and the air stream are separated by the semi-permeable membrane to prevent liquid droplets from crossing over. The two streams, in a cross-flow arrangement, exchange heat and moisture through the membrane, which only selectively permits the transport of water vapor and heat. The two flows are assumed hydrodynamically fully developed while developing thermally and in concentration. Different from traditional method of assuming a uniform temperature (concentration) or a uniform heat flux (mass flux) boundary condition, the real boundary conditions on membrane surfaces are numerically obtained by simultaneous solution of momentum, energy and concentration equations for the two fluids. Equations are then coupled on membrane surfaces. The naturally formed boundary conditions are then used to calculate the local and mean Nusselt and Sherwood numbers along the channels. Experimental work is performed to validate the results. The different features of the channels in comparison to traditional metal-formed parallel-plates channels are disclosed.