Kenics型静态混合器中幂律流体与颗粒混合过程分析
Analysis on Mixing Process of Power-law Fluid and Particles in Kenics Static Mixer
张静 1蒋灿 1周承昊 1王瑶 1龚斌1
作者信息
- 1. 沈阳化工大学 机械与动力工程学院,辽宁 沈阳 110142
- 折叠
摘要
针对Kenics型静态混合器内固体颗粒在幂律流体中的孤岛现象的产生机理进行研究.运用Fluent数值模拟固相颗粒与CMC水溶液在Kenics静态混合器中的混合过程,并利用浓度变异系数(COV)对颗粒分布特性进行量化分析.研究表明:提高流体表观黏度和流体入口速度,颗粒停留时间缩短,COV值降低,混合效果提高.在第4～8个扭旋叶片中间截面上均形成了两对对称的无粒子孤岛,降低流体表观黏度和提高流体入口速度,孤岛边界更清晰.扭旋叶片诱导的内流涡旋和近壁面涡旋有较高的涡量,涡旋中心局域形成无粒子孤岛,相邻叶片交错区域,随着涡旋耗散孤岛消失.
Abstract
The cause of island without particle in the power-law fluid was investigated in Kenics static mixers.The mixing process of solid particles and CMC solution with three concentrations in Kenics static mixer was numerically simulated by Fluent,and the concentration coefficient of variation(COV)was used to quantitatively analyze the particle distribution.On the middle cross-section of 4th～8th twist blades,two pairs of island without particle were formed in power-law fluid.In this study,the residence time of particle was shortened and the boundary of island was clearer when the apparent viscosity of power-law fluid reduced and the velocity of mixer inlet increased.But the lower COV value and the better mixing effect were obtained with increasing apparent viscosity and flow velocity.The vorticity absolute value was high in internal flow vortex and near-wall vortex induced by the twisted blade,and there were islands without particle in the center region of vortices.The island without particle disappeared with the vortex dissipation near the interface of adjacent blades and the outlet of twisted blades.
关键词
Kenics静态混合器/幂律流体/液固混合/变异系数/无粒子孤岛Key words
Kenics static mixer/Power law fluid/Liquid-solid mixing/Coefficient of variation/Island without particle引用本文复制引用
基金项目
辽宁省应用基础研究计划(2022JH2/101300077)
辽宁省教育厅自然科学研究基础项目(LJ2020016)
出版年
2024
NETL
NSTL
万方数据