摘要
在窄间隙矩形通道内设置4对周期性分布的矩形块纵向涡发生器(LVG),应用相位多普勒粒子图像分析仪技术(PDPA)对该通道内单相流动的速度场进行可视化测量。通道内单相层流和湍流的主流速度分布表明:当流动经过LVG时,将会产生以二次流动为特征的纵向涡(LV);LV使得流动边界层的发展受到抑制或破坏作用,强化通道内部流动的横向对流运动,因此能够起到强化传热的作用。
Four pairs of rectangular blocks as longitudinal vortex generators（LVG） were mounted periodically in a narrow rectangular channel.To investigate the fluid flow structure in the channel,PDPA was employed to visually measure the single-phase velocity distribution.The velocity distribution of laminar and turbulent regime indicates that the longitudinal vortex will produce in the shape of secondary flow when the flow pass LVG,the development of flow boundary layer is restrained or broken,and the flow convective motion will be strengthened in the channel,so the heat transfer in the channel can be enhanced.This experiment reveals the qualitative physical mechanism of heat transfer enhancement in the narrow rectangular channel with longitudinal vortex.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2011年第1期85-88,共4页
Nuclear Power Engineering
基金
2005年度国家自然科学基金(50576089)
2006年度空泡物理和自然循环重点实验室基金(9140C7101030602)
关键词
窄间隙矩形通道
单相水
纵向涡
可视化
Narrow rectangular channel
Single-phase water
Longitudinal vortex
Heat transfer enhancement
