Heat and mass transfer in a cross-flow membrane-based enthalpy exchanger under naturally formed boundary conditions
Heat and mass transfer in a cross-flow membrane-based enthalpy exchanger under naturally formed boundary conditions
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DOI：
10.1016/j.ijheatmasstransfer.2006.06.025
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发表时间：
2007
影响因子：
5.2
通讯作者：
Li-Zhi Zhang
中科院分区：
文献类型：
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作者：
Li-Zhi Zhang
研究了用于废气热湿回收的错流平行板膜全热交换器的传热传质机理。假设流动是层流的，流体动力学充分发展，但在热和浓度边界发展。相反的传统方法，假设一个统一的温度（浓度）或均匀的热通量（质量通量）的边界条件，在这项研究中，交换器表面上的真实的边界条件得到的数值解的耦合方程，管理的动量，热能，和水分在两个横流的空气流和通过膜的转移。自然形成的热和质量边界条件，然后用于计算本地和平均努塞尔和舍伍德数沿着的横流通道，在发展区域和以后。与均匀温度（浓度）和均匀热通量（质量通量）边界条件下的结果进行了比较，对于各种长宽比的矩形管道。通过实验验证了出口含水率预测的正确性。
Heat and mass transfer mechanisms in a cross-flow parallel plate membrane-based enthalpy exchanger for heat and moisture recovery from exhaust air streams are investigated. The flow is assumed laminar and hydrodynamically fully developed, but developing in thermal and concentration boundaries. Contrary to the traditional methods to assume a uniform temperature (concentration) or a uniform heat flux (mass flux) boundary condition, in this study, the real boundary conditions on the exchanger surfaces are obtained by the numerical solution of the coupled equations that govern the transfer of momentum, thermal energy, and moisture in the two cross-flow air streams and through the membrane. The naturally formed heat and mass boundary conditions are then used to calculate the local and mean Nusselt and Sherwood numbers along the cross-flow passages, in the developing region and thereafter. A comparison was made with those results under uniform temperature (concentration) and uniform heat flux (mass flux) boundary conditions, for rectangular ducts of various aspect ratios. An experiment is done to verify the prediction of outlet moisture content.