http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
수소연료전지의 성능 향상을 위한 다공성 표면에서의 물 제거에 대한 연구
이경민(Kyeong-Min LEE),박찬경(Chan-Kyung Park),손도협(Do-Hyeop Son),강우성(Woo-Seong Kang),박상혁(Sang-Hyuk Park),현승혁(Seung-Hyuk Hyun),김한상(Han-Sang Kim) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Polymer electrolyte membrane fuel cells (PEMFCs) have been considered as the power sources to replace internal combustion engines. Water is generated in the catalyst layer of PEMFC and excessive water can cause flooding. It is still an important task to remove water properly to prevent flooding. Hence, proper water management in PEMFCs is a core issue for improving performance and longevity. This study presents the experimental approach to understand the water removal behavior on porous gas diffusion layer (GDL) surfaces in the flow channel of PEMFC. To do this, a sample GDL/flow channel model was fabricated to investigate the water transport characteristics in a PEM fuel cell using direct ex-situ water visualization. Using a high-speed camera, the process from growth to detachment of water droplets is photographed for two types of GDL samples (with micro porous layer (MPL) and without MPL). The contact angle hysteresis (CAH) according to droplet aspect ratio (DAR) at water droplet detachment is mainly investigated is compared with the static contact angle (SCA) of the GDL surface. In addition, at detachment, the DAR and CAH according to air Reynolds number are compared with the SCA. These data show that the adhesion of the GDL surface has a dominant effect on water removal on porous surfaces. It is expected that the data from this study can contribute to the basic design of GDL structures with enhanced water removal characteristics.