A numerical analysis was performed to study PEMFC characteristics depending on the flow direction of reactant gas in cathode gas channel using the Fluent. As cathode relative humidity increases, water mass fraction increases due to back diffusion from cathode. For the both of co-flow and counter-flow cases, water mass fraction is higher near the hydrogen inlet region where the chemical reaction rate is high. In overall, counter-flow case gives higher current density compared to co-flow case for the same operating conditions. However, the difference in the current density is not high. The temperature is also higher near the hydrogen inlet region due to the chemical reaction rate for the both of co-flow and counter-flow cases.

Abstract
 1. 서론
 2. 연구 방법
  2.1 해석 모델
  2.2 지배 방정식
  2.3 계산 조건
 3. 결과 및 토의
  3.1 전해질내의 물분포 분석
  3.2 I-V 성능곡선 분석
  3.3 전해질내의 온도분포 분석
 4. 결론
 참고문헌

• 류의환(공주대학교 대학원 기계공학과) | Eui Hwan Ryu 저자
• 김우태(공주대학교 기계자동차공학부) | Woo Tae Kim 교신저자