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

机译:膜平行板通道中的流体流动和传热传质,用于液体干燥剂空气除湿

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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.
机译:研究了膜形成的平行板通道中的流体流动和对流传热传质。膜形成的通道用于液体干燥剂空气除湿。液体干燥剂和气流被半透膜隔开,以防止液滴交叉。两股气流以错流方式通过膜交换热和水分,而膜仅选择性地允许水蒸气和热的传输。假定这两个流在热力和集中力作用下都在流体动力学上得到充分发展。与假定均一温度(浓度)或均一热通量(质量通量)边界条件的传统方法不同,通过同时求解两种流体的动量,能量和浓度方程,数值获得膜表面的实际边界条件。然后将方程耦合到膜表面。然后使用自然形成的边界条件来计算沿通道的局部Nusselt数和均值Sherwood数。进行实验工作以验证结果。公开了与传统的金属形成的平行板通道相比,通道的不同特征。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2012年第10期|p.2571-2580|共10页
  • 作者单位

    Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering,South China University of Technology, Guangzhou 510640, China;

    Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering,South China University of Technology, Guangzhou 510640, China State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China;

    Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering,South China University of Technology, Guangzhou 510640, China;

    Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering,South China University of Technology, Guangzhou 510640, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    heat transfer; mass transfer; membrane parallel-plates channels; liquid desiccant; air dehumidification; naturally formed boundary conditions;

    机译:传热;传质;膜平行板通道;液体干燥剂;空气除湿;自然形成的边界条件;

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