摘要
为探究管内插螺旋与液固两相流复合技术对流场与传热的影响机理,采用粒子图像处理技术(PIV)实验研究管内流体的涡量场及速度场分布规律。对比实验结果表明:内插螺旋液固两相流使流体呈螺旋流动,且增大流体的运动强度。在雷诺数Re=26400~33000,总平均涡量比光管增大21.4%~35.8%;径向速度呈正负波动分布,平均径向速度为光管的6.5~19.8倍,径向速度波动为光管的51~609倍;轴向速度沿壁面向管中心递增,轴向速度波动比光管增大41.5%~60.6%;平均湍动能比光管增大162.7%~254.6%,因此内插螺旋液固两相流复合技术更有利于传热。
Experiments of liquid-solid two-phase flow in a tube with a spiral insert were carried out to research the distribution of vorticity field and velocity field using particle image velocimetry(PIV)for exploring the influence of spiral insert and liquid-solid two-phase flow on the flow field.The experimental results show that the liquid-solid two-phase spiral flow was formed and the motion intensity of fluid was increased under the action of spiral insert.In the range of Re=26400-33000,the total average vorticity was raised by 21.4%-35.8%over plain tube;the average radial velocity was 6.5-19.8 times of that of the plain tube;the radial velocity fluctuated in positive and negative directions and its fluctuation was 51-609 times of that of the plain tube.The axial velocity increased from the wall to the center of the tube,and its fluctuation and the average turbulent energy were increased by 41.5%-60.6%and 162.7%-254.6%over the plain tube respectively.Therefore,liquid-solid two-phase spiral flow is more conducive to heat transfer.
作者
彭德其
张凯博
俞天兰
吴淑英
王志奇
乔硕
禹卫东
PENG De-qi;ZHANG Kai-bo;YU Tian-lan;WU Shu-ying;WANG Zhi-qi;QIAO Shuo;YU Wei-dong(School of Mechanical Engineering,Xiangtan University,Xiangtan 411105,China;School of Mechanical Engineering,Hunan University of Technology,Zhuzhou 412007,China;Hunan Zhongxing Equipment Installation Engineering Co.Ltd.,Zhuzhou 412000,China)
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2021年第2期243-250,共8页
Journal of Chemical Engineering of Chinese Universities
基金
湖南省自然科学基金(2018JJ4054)。
关键词
粒子图像测速技术
内插螺旋
液固两相流
流场
particle image velocimetry(PIV)
spiral insert
liquid-solid two-phase flow
flow field
