Two-phase flow in anode flow field of a small direct methanol fuel cell in different gravities

作     者：GUO Hang WU Feng YE Fang ZHAO JianFu WAN ShiXin LüCuiPing MA ChongFang 

作者机构：Key Laboratory of Enhanced Heat Transfer and Energy ConservationMinistry of Education of ChinaCollege of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China Key Laboratory of Heat Transfer and Energy ConversionBeijing MunicipalityBeijing University of TechnologyBeijing 100124China Institute of MechanicsChinese Academy of SciencesBeijing 100080China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2009年第52卷第6期

页      面：1576-1582页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 

基　　金：Supported by the National Natural Science Foundation of China(Grant No. 50406010) Excellent Talents Programme of Beijing Municipality(Grant No. 20081D0501500167) 

主　　题：direct methanol fuel cells microgravity two-phase flow visualization bubble behavior 

摘      要：An in-situ visualization of two-phase flow inside anode flow bed of a small liquid fed direct methanol fuel cells in normal and reduced gravity has been conducted in a drop *** anode flow bed con-sists of 11 parallel straight *** length,width and depth of single channel,which had rec-tangular cross section,are 48.0,2.5 and 2.0mm,*** rib width was *** experi-mental results indicated that when the fuel cell orientation is vertical,two-phase flow pattern in anode channels can evolve from bubbly flow in normal gravity into slug flow in *** size of bub-bles in the reduced gravity is also *** microgravity,the bubbles rising speed in vertical channels is obviously slower than that in normal *** the fuel cell orientation is horizontal,the slug flow in the reduced gravity has almost the same characteristic with that in normal *** implies that the effect of gravity on two-phase flow is small and the bubbles removal is governed by viscous *** the gas slugs or gas columns occupy channels,the performance of liquid fed direct methanol fuel cells is failing *** infers that in long-term microgravity,flow bed and operating condition should be optimized to avoid concentration polarization of fuel cells.