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Analysis of the effects of mass transfer on heat transfer in the process of moisture exchange across a membrane 被引量:9

Analysis of the effects of mass transfer on heat transfer in the process of moisture exchange across a membrane
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摘要 A theoretical study was conducted to investigate the effects of mass transfer on heat transfer in the process of moisture exchange across a membrane and a mathematical model describing the heat transfer with consideration of the effect of mass transfer was developed.A dimensionless variable,ψi,which presents the degree to which the mass transfer affects the heat transfer,was proposed through theoretical analysis.With calculating of this dimensionless variable,the heat transfer coupled with mass transfer can be converted into a conventional heat transfer,making the heat transfer calculation simpler and more easily to understand.On the basis of theoretical analysis,the effects of mass transfer on heat transfer were numerically studied.The results show that,in the case that the temperature gradient and mass transfer are in the same direction,ψi is greater than unity,and the mass transfer acts to enhance the heat transfer;in the case that the temperature gradient and mass transfer are in opposite directions,ψi is less than unity,and the mass transfer works to hinder the heat transfer.When the mass flux is small,the effect of the mass transfer is weak.When the mass flux is large,the heat flux carried by the mass flux has a considerable impact on the heat flux,and ψi,deviates from unity significantly. A theoretical study was conducted to investigate the effects of mass transfer on heat transfer in the process of moisture exchange across a membrane and a mathematical model describing the heat transfer with consideration of the effect of mass transfer was developed. A dimensionless variable, ψi, which presents the degree to which the mass transfer affects the heat transfer, was proposed through theoretical analysis. With calculating of this dimensionless variable, the heat transfer coupled with mass transfer can be converted into a conventional heat transfer, making the heat transfer calculation simpler and more easily to understand. On the basis of theoretical analysis, the effects of mass transfer on heat transfer were numerically studied. The results show that, in the case that the temperature gradient and mass transfer are in the same direction, ψi is greater than unity, and the mass transfer acts to enhance the heat transfer; in the case that the temperature gradient and mass transfer are in opposite directions, ψi is less than unity, and the mass transfer works to hinder the heat transfer. When the mass flux is small, the effect of the mass transfer is weak. When the mass flux is large, the heat flux carried by the mass flux has a considerable impact on the heat flux, and ψi , deviates from unity significantly.
机构地区 School of Aerospace
出处 《Chinese Science Bulletin》 SCIE EI CAS 2010年第12期1221-1226,共6页
基金 supported by the National Natural Science Foundation of China (Grant No. 50576040)
关键词 传热传质 交换过程 水分 细胞膜 质量流量 传热计算 温度梯度 传质效果 membrane, moisture exchange, mass transfer, heat transfer
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参考文献10

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