PIV experiment for tube fitted with rotors

doi:10.3969/j.issn.0438-1157.2014.12.015

Abstract

Abstract: Particle image velocimetry was used to study the tubes fitted with and without "Jienengxin" rotors and the plain tube, and the velocity fields and turbulent kinetic energy distribution were obtained. The experimental results reveal that, compared with the plain tube, the flow field of tube is changed with the rotors inserted in. The axial velocity distribution turns to M type from parabolic type; the radial velocity is an order of magnitude higher than that of plain tube in a large part of the axial region, with positive and negative values alternatively, namely the direction of velocity changes constantly. The turbulent kinetic energy is promoted remarkably, which means that better heat transfer effect could be achieved by "Jienengxin" rotors.

Key words: particle image velocimetry, rotor, flow field, turbulent kinetic energy

摘要： 采用粒子图像测速技术(PIV)对安装"洁能芯"转子的换热管及光管进行了实验研究,获得了换热管内速度场及湍动能的分布.实验结果表明:与光管相比,换热管内安装"洁能芯"转子后,流场发生了改变,轴向速度分布由近抛物线形变为近M形分布;径向速度在管中心轴线两侧一个相当大的区域内比光管高出一个数量级,并且出现正负交替变化,即速度方向在不断地改变;作为最能体现"洁能芯"转子强化换热效果的指标,湍动能有了显著的提高,说明了"洁能芯"转子具有很好的强化传热功能.

关键词: 粒子图像测速, 转子, 流场, 湍动能

CLC Number:

TK123

HE Lichen, GUAN Changfeng, ZHANG Chongwen, HE Changjiang, HE Jianyun, YAN Hua. PIV experiment for tube fitted with rotors[J]. CIESC Journal, 2014, 65(12): 4755-4759.

何立臣, 关昌峰, 张崇文, 何长江, 贺建芸, 阎华. 换热管内安装转子的PIV实验[J]. 化工学报, 2014, 65(12): 4755-4759.

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