摘要
针对垂直管气力输送过程,采用计算流体力学与离散元(computational fluid dynamics and discrete element method,CFD-DEM)耦合数值模拟的方法,从截面颗粒体积分数、管道内流型演变及单位管长压降等3个方面对不同表观气速下垂直管气力输送颗粒运动特性展开研究。研究结果表明:随着表观气速的增加,管内流型依次呈现高浓度环核流、中浓度环核流、低浓度环核流及悬浮流;截面颗粒体积分数随着管内流型的转变逐渐减小;得到输送压降、输送流型随表观气速变化的相图模型及压降最低点的速度为8 m·s^(-1)。
The movement characteristics of pneumatic conveying particle,including the volume of cross-section particles,the flow pattern inside the pipe and the pressure drop per unit pipe range,were studied by the computational fuid dynamics and discrete element method coupling numerical simulation(CFD-DEM)under different superficial gas velocity for the vertical pipe pneumatic conveying process.The results show that with the increase of superficial gas velocity,the flow patterns in the pipe successively presents high concentration annular fow,medium concentration annular fow,low concentration annular fow and suspension fow.The volume fraction of section particles gradually decreases with the variation of fow pattern in the pipe.The phase diagram model of conveying pressure drop and conveying fow pattern variation with superficial gas velocity is obtained,the lowest pressure drop velocity is 8 m·s^(-1).
作者
周甲伟
郭小乐
巴涵
李冰
刘晓辉
ZHOU Jiawei;GUO Xiaole;BA Han;LI Bing;LIU Xiaohui(School of Mechanical Engineering,North China University of Water Resources and Electric Power,Zhengzhou 450045,China;School of Construction Machinery,Chang'an University,Xi'an 710064,China)
出处
《工程热物理学报》
EI
CSCD
北大核心
2023年第9期2464-2473,共10页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.51805166)
河南省科技攻关项目资助(No.222102320084)
河南省高校科技创新团队支持计划(No.22IRTSTHN018)
河南省重大科技专项(No.201110210300)。
关键词
垂直管道气力输送
CFD-DEM耦合数值模拟
流型演变
相图模型
vertical pipeline pneumatic conveying
CFD-DEM coupling simulation
flow pattern evolution
phase diagram model
