Three-dimensional CFD modeling of a planar membrane humidifier for PEM fuel cell systems |
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Authors: | Nasser Baharlou Houreh Ebrahim Afshari |
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Affiliation: | Department of Mechanical Engineering, Faculty of Engineering, University of Isfahan, Isfahan, Iran |
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Abstract: | A three-dimensional numerical model is developed to investigate and compare the performance of humidifiers with counter-flow and parallel-flow configurations. This model has a set of coupled equations including conservations of mass, momentum, species and energy. The results indicate that in counter-flow humidifier, water and heat transfer is more than that of the parallel-flow that leads to a higher dew point at dry side outlet, consequently, a better humidifier performance. An increase in temperature and a decrease in mass flow rate at dry side inlet lead to a better humidifier performance. However at the low flow rates the humidifier performance does not change a lot by preheating the inlet dry gas. An increase in relative humidity at dry side inlet does not offer any advantage. |
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Keywords: | Membrane humidifier PEM fuel cell CFD Counter flow Inlet conditions |
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