摘要
本文采用PIV测量技术结合数值模拟方法,研究一种高速剪切搅拌器内的三维流场,着重对垂直搅拌与斜搅拌两种搅拌轴安装方式的流场进行稳态和非稳态的模拟。数值计算的平均流场与实验良好吻合,都显示了斜搅拌有利于减小搅拌罐内流动低速区。非稳态模拟的结果表明,搅拌头附近明显的射流作用、静子齿缝处湍动能的耗散和搅拌头附近较大的周向压力梯度,增强了搅拌器的分散作用。
This paper presents a study of the 3-D flow in a mixer,which uses the high shear-rate between the stator and rotor for decentralization;and the mixer is designed for preparation of catalyst slurry for fuel cells.PIV measurements and numerical simulations are carried out,with main attentions paid to both the steady and unsteady simulations for vertically and obliquely positioned agitators.The numerical results agree well with the experimental data,both of which have unveiled the smaller low-speed flow region for the obliquely positioned agitator.Jet flows near the agitator, high turbulent energy dissipation in the gap of stator/rotator and high circumferential pressure gradient near the mixer head are observed.All of these factors contribute to the decentralization.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2013年第6期1065-1068,共4页
Journal of Engineering Thermophysics
基金
国家科技支撑计划项目(No.2009BAF40B02)
国家自然科学基金项目(No.51176048)
关键词
高速剪切
搅拌器
静转子
PIV测量
数值模拟
high shear-rate
mixer
stator-rotor
PIV measurement
numerical simulation
