PEM燃料電池-兩相流模擬分析

A two-phase flow and transport model of a PEM fuel cell

陳名恩

指導教授 ： 林昭安

國立清華大學/工學院/動力機械工程學系/碩士(2006年)

https://doi.org/10.6843/NTHU.2006.00115

摘要

In the present study, fuel cell performance on the PEMFC cathode is investigated numerically. The modeling framework is assuming that the transport process is diffusion controlled and the convection transport is neglected. Both the single phase and two-phase flows are studied. The single phase, a 1-D, non-isothermal model is developed for various heat generation mechanisms, including irreversible heat due to electrochemical reactions, entropic heat, and Joule heating arising from the electrolyte ionic resistance. The thermal model is further coupled with the electrochemical and mass transport models. The computational domain includes the gas diffusion layer, the catalyst later and the membrane. The predicted results are validated with the experimental data of Liu et al. The effect of various operational parameters on the PEM fuel cell performance is investigated in detail. The results demonstrate the usefulness of this computational model as a design and optimization tool. For the two-phase simulations, the temperature is assumed to remain constant throughout the fuel cell. The reason is that the condensation and evaporation effect of the liquid water is not accounted for. Here, the phase change process is modeled as an equilibrium (i.e. infinitely fast) process, while the transport of liquid water is governed by pressure, surface tension and electro-osmotic drag. Results show that the inclusion of liquid water transport greatly enhances the predictive capability of the model.

關鍵字

質子交換膜 ； 燃料電池 ； 兩相流 ； 非等溫 ； 電化學 ； 毛細管力

並列摘要

無資料

並列關鍵字

proton exchange membrane ； fuel cell ； two-phase flow ； non-isothermal ； electrochemical ； capillary force

參考文獻

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