摘要
壁面剪切力是气液两相流近壁面传递过程的关键参数。基于极限扩散电流方法实验研究了摇摆状态下上升实验段内气液两相弹状流的壁面切应力特性,获得了壁面切应力的径向分布规律和轴向演化规律。实验段的内径为50 mm,高度为2.3 m,摇摆频率为1~2.5 Hz,摇摆幅度为10~30 mm。结果表明,弹状流下Taylor气泡和液塞的间歇性流动导致瞬态壁面切应力具有脉动性特征,静态条件下壁面切应力的径向分布比较均匀,沿流动方向略有增大。随着摇摆幅度和频率的增加,Taylor气泡逐渐变短,瞬态壁面切应力的峰值区域减小。
Wall shear stress is a key parameter in the near wall transfer process of gas-liquid two-phase flow.Based on the limit diffusion current method,the wall shear stress characteristics of gas-liquid two-phase slug flow in an upward tube under rolling condition were experimentally studied,and the radial distribution and axial evolution of the wall shear stress were obtained.The test section is 2.3 m in height,the rolling amplitude and frequency are in the ranges of 10 mm to 30 mm and 1 Hz to 2.5 Hz,respectively.The results show that the intermittent flow of Taylor bubbles and liquid plugs under slug flow causes the transient wall shear stress to have pulsating characteristics.The radial distribution of the wall shear stress under static conditions is relatively uniform and slightly increases along the flow direction.As the rolling amplitude and frequency increase,the length of Taylor bubbles tends to be shorter,resulting in decrease in the peak region of transient wall shear stress.
作者
李乃良
陈聚凯
韩骏楷
赵庆杰
张一帆
LI Nailiang;CHEN Jukai;HAN Junkai;ZHAO Qingjie;ZHANG Yifan(School of Low-carbon Energy and Power Engineering,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;School of Chemical Engineering&Technology,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China)
出处
《化工学报》
EI
CSCD
北大核心
2023年第12期4852-4862,共11页
CIESC Journal
基金
国家自然科学基金项目(52206215,52204251)
江苏省“双创博士”项目(JSSCBS20211189)
江苏省青年科学基金项目(BK20210502)。
关键词
气液两相流
气含率
弹状流
切应力
上升管
gas-liquid flow
gas holdup
slug flow
wall shear stress
riser
