In the present study, a three dimensional numerical simulation is performed to investigate the heat and water transfer enhancement in a polymer membrane humidifier with partially blocked channel. The experimental tests are also conducted for validation purposes. The thermal-hydraulic performance factor (JF) is introduced as the main parameter to evaluate the humidifier performance with considering pressure drop. The higher value of JF indicates the higher heat transfer with the lower pressure drop. When there are equal mass flow rates at both wet and dry sides, three ranges of flow rates are identified. At low flow rates (less than 4.4 mg/s), with and without considering pressure drop, the blocked humidifier shows weaker performance than the simple humidifier, so blocking is not recommended under any circumstances. At moderate flow rates (between 4.4 mg/s and 6.65 mg/s), regardless of pressure drop, the performance of the blocked humidifier is better than that of the simple humidifier, and with considering the pressure drop, the blocked humidifier performs weaker. At high flow rates (greater than 6.65 mg/s), with and without considering pressure drop, the blocked humidifier performs better than the simple humidifier. The same trend holds for the case of constant dry side flow rate with the variable wet side flow rate.

在本研究中，进行了三维数值模拟，以研究具有部分阻塞通道的聚合物膜加湿器中的热和水传递增强。实验测试也用于验证目的。引入热工液压性能因数（JF）作为评估加湿器性能并考虑压力降的主要参数。JF值越高，传热越高，压降越低。当湿侧和干侧的质量流量相等时，将确定三个流量范围。在低流量（小于4.4 mg / s）下，无论是否考虑压降，阻塞式加湿器的性能均比简单加湿器弱，因此在任何情况下均不建议阻塞。在中等流速下（介于4.4 mg / s和6.65 mg / s之间），无论压降如何，阻塞式加湿器的性能都优于简单加湿器，并且考虑到压降，阻塞式加湿器的性能较弱。在高流速（大于6.65 mg / s）下，无论是否考虑压降，阻塞式加湿器的性能均优于简单加湿器。对于恒定的干侧流量和可变的湿侧流量，情况也适用相同的趋势。阻塞式加湿器的性能优于简单加湿器。对于恒定的干侧流量和可变的湿侧流量，情况也适用相同的趋势。阻塞式加湿器的性能优于简单加湿器。对于恒定的干侧流量和可变的湿侧流量，情况也适用相同的趋势。