摘要
针对微小型直接甲醇燃料电池阳极流场,采用VOF(volume of fluid)方法模拟了液体通流微小通道内壁面逸出气泡的动态行为,讨论了液体物性、气体流速、逸出气孔直径对气泡形成、生长及脱离等过程以及流动阻力的影响。结果表明:随着甲醇溶液浓度的升高,单个气泡的脱离体积、脱离时间和流动阻力系数均减小;气体流速增加,气泡的脱离体积和流动阻力系数增大,但气泡的脱离时间减小;在一定气体流速下,气泡的脱离时间随着气体逸出孔径的增大而减小,但气泡的脱离体积和流动阻力系数却随之增加。
Based on micro direct methanol fuel cells,a numerical investigation using the volume of fluid（VOF） method is performed on the dynamic behaviors of a gas bubble subjected to liquid flow in a micro-channel.The process of the gas bubble emergence,growth,deformation and detachment are revealed by tracking the evolution of the liquid-gas interface,and the influences of liquid physical property,air flow rate and pore diameter on the bubble dynamics and flow resistance are discussed.The numerical simulation results show that the bubble departure volume,detachment time and flow resistance coefficient decrease with increasing methanol concentration.Higher air inlet flow rate results in the earlier bubble detachment,larger bubble departure volume and higher flow resistance coefficient.Increasing the diameter of pore from which the bubble emerging,the bubble detachment time is shortened while the bubble departure volume and flow resistance coefficient are increased.
出处
《热科学与技术》
CAS
CSCD
2011年第2期110-116,共7页
Journal of Thermal Science and Technology
基金
国家自然科学基金资助项目(50876119)
重庆市自然科学基金资助项目(CSTC
2009BB6212)
关键词
气泡
VOF方法
小槽道
动力特性
数值模拟
bubble
volume of fluid method
mini-channel
dynamics
numerical simulation
