个人信息Personal Information
教授
博士生导师
硕士生导师
性别:男
毕业院校:Nottingham trent University
学位:博士
所在单位:能源与动力学院
学科:制冷及低温工程. 工程热物理. 热能工程
办公地点:能动学院新大楼822室
联系方式:wzhongli@dlut.edu.cn
电子邮箱:wzhongli@dlut.edu.cn
Lattice boltzmann investigations on drag reduction in microchannel flow with bionic surfaces
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论文类型:会议论文
发表时间:2011-06-19
收录刊物:EI、Scopus
卷号:2
页面范围:1-9
摘要:In this paper, four types of micro-patterned surfaces, which are covered with ridge-shaped grooves, V-shaped grooves, shield-shaped grooves and straight slot grooves, are employed to investigate the drag reduction effect. Lattice Boltzmann method (LBM), a new numerical approach on mescoscopic level, is used to conduct the numerical simulations. The micro-grooved surfaces possess the drag reduction performance because the micro-structure affects the flow beahviours. The existence of the vortices formed within the grooves not only decrease the shear force between fluid and walls but also reduce the contact area between fluid and walls, which can lead to a reduction of pressure loss. The different grooved-surfaces have different degrees of drag reduction abilities: ridge-shaped grooves > V-shaped grooves > shield shaped grooves > straight slot grooves. Besides, the geometrical optimizations for the ridge-shaped grooves, which show the highest drag reduction performance, are performed as well. The results suggest that, for the purpose of drag reduction, the ridge-shaped grooves with smaller width-height ratio are recommended for the lower Reynolds number flow while the ridge-shape grooves with larger width-height ratio are more suitable for the larger Reynolds number flow. Copyright ? 2011 by ASME.