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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Three-dimensional multiphase flow modeling of membrane humidifier for PEM fuel cell application
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Three-dimensional multiphase flow modeling of membrane humidifier for PEM fuel cell application

机译：用于PEM燃料电池的膜式加湿器的三维多相流建模

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Purpose - In this paper, a single module of cross-flow membrane humidifier is evaluated as a three-dimensional multiphase model. The purpose of this paper is to analyze the effect of volume flow rate, dry temperature, dew point wet temperature and porosity of gas diffusion layer on the humidifier performance. Design/methodology/approach - In this study, one set of coupled equations are continuity, momentum, species and energy conservation is considered. The numerical code is benchmarked by the comparison of numerical results with experimental data of Hwang et al. Findings - The results reveal that the transfer rate of water vapor and dew point approach temperature (DPAT) increase by increasing the volume flow rate. Also, it is found that the water recovery ratio (WRR) and relative humidity (RH) decrease with increasing volume flow rate. In addition, all mixed results decrease with increasing dry side temperature especially at high volume flow rates and this trend in high volume flow rates is more sensible. Although the transfer rate of water vapor and DPAT increases with increasing the wet inlet temperature, WRR and RH reduce. Increasing dew point temperature effect is more sensible at the wet side is compared with the dry side. The humidification performance will be enhanced with increasing diffusion layer porosity by increasing the wet inlet dew point temperature, but has no meaningful effect on other operating parameters. The pressure drop along humidifier gas channels increases with rising flow rate, consequently, the required power of membrane humidifier will enhance. Originality/value - According to previous studies, the three-dimensional numerical multiphase model of cross-flow membrane humidifier has not been developed.
机译：目的-在本文中，交叉流膜加湿器的单个模块被评估为三维多相模型。本文的目的是分析体积流量，干燥温度，露点湿温度和气体扩散层的孔隙度对加湿器性能的影响。设计/方法/方法-在这项研究中，考虑了一组耦合方程，即连续性，动量，物种和能量守恒。通过将数值结果与Hwang等人的实验数据进行比较，以数字代码为基准。结果-结果表明，水蒸气的传输速率和露点接近温度（DPAT）通过增加体积流量而增加。另外，发现随着体积流量的增加，水的回收率（WRR）和相对湿度（RH）降低。此外，所有混合结果都随着干侧温度的升高而降低，尤其是在高体积流量下，这种高体积流量的趋势更加合理。尽管水蒸气和DPAT的传输速率随湿入口温度的升高而增加，但WRR和RH却降低了。与干侧相比，在湿侧增加露点温度的影响更为明显。通过增加湿入口露点温度，随着扩散层孔隙率的增加，加湿性能将得到增强，但对其他运行参数没有有意义的影响。沿着加湿器气体通道的压降随着流速的增加而增加，因此，膜式加湿器的所需功率将增加。原创性/价值-根据以前的研究，尚未开发出错流式膜式加湿器的三维数值多相模型。

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