Three-dimensional turbulent flow and conjugate heat and mass transfer in a cross-flow hollow fiber membrane bundle for seawater desalination
Three-dimensional turbulent flow and conjugate heat and mass transfer in a cross-flow hollow fiber membrane bundle for seawater desalination
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DOI：
10.1016/j.ijheatmasstransfer.2017.12.044
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发表时间：
2018-05
影响因子：
5.2
通讯作者：
Guopei Li;Li-Zhi Zhang
中科院分区：
文献类型：
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作者：
Guopei Li;Li-Zhi Zhang
采用错流增湿中空纤维膜束（MBH）进行海水淡化。通过数值求解空气侧、水侧和膜侧的连续性方程、动量方程、能量方程和浓度方程，对管束内的流体流动和传热传质进行了耦合研究。与以往研究中只考虑二维层流或湍流不同，本文采用三维低雷诺数k-ε湍流模型（3D LowRe k-ε）模拟空气侧全三维湍流流动。为了进行比较，除了所提出的三维湍流模型外，还采用了其他三种常用的模型，即二维LowRe k-ε湍流模型、二维层流模型和三维层流模型，在雷诺数从100到900的较宽范围内研究了空气侧湍流对管束内流体流动和传热传质特性的影响。结果发现，三维湍流模型最好地预测的摩擦系数和努塞尔和舍伍德数为各种模块包装分数在较高的雷诺数高于650。通过海水淡化系统的流速测量和性能试验，验证了该方法的有效性。
A cross-flow hollow fiber membrane bundle for humidification (MBH) is used for seawater desalination. Fluid flow and conjugate heat and mass transfer in the bundle are studied by numerically solving the continuity, momentum, energy and concentration equations for air side, water side and membrane side, simultaneously in a conjugated way. Contrary to previous studies which considered only 2D laminar or turbulent flow, in this research the full three-dimensional turbulent flow in air side is modelled with a three-dimensional low-Reynolds-numberk-εturbulence model (3D LowRe k-ε). For comparison, besides the proposed 3D turbulence model, other three previously used models, namely, a 2D LowRe k-εturbulence model, a 2D laminar model, and a 3D laminar model, are also used to investigate the effects of air side turbulence on fluid flow and heat and mass transfer properties in the bundle under a wide range of Reynolds numbers from 100 to 900. It is found that the 3D turbulence model best predicts the friction factors and Nusselt and Sherwood numbers for various module packing fractions under higher Reynolds numbers above 650. The results are validated by velocity measurement and performance test with a seawater desalination system.