Heat transfer of a sweeping jet impinging at narrow spacings
Heat transfer of a sweeping jet impinging at narrow spacings
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扫掠射流在狭窄间距内撞击的传热
DOI：
10.1016/j.expthermflusci.2019.01.007
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发表时间：
2019-05
影响因子：
3.2
通讯作者：
Wen Xin
中科院分区：
文献类型：
--
作者：
Zhou Wenwu;Yuan Lin;Liu Yingzheng;Peng Di;Wen Xin
扫掠射流具有时间连续、空间振荡的特点，引起了人们的广泛关注。本文研究了窄间距扫掠射流冲击的换热和流动特性。雷诺数的影响（即，Re= 5000、10，000、15，000）和射流到壁间距（即，H/D= 0.5，1.0，2.0，3.0）对传热的影响。高分辨率的粒子图像测速（PIV）系统被应用到相关的传热结果与相关的射流冲击的流场。研究发现，随着雷诺数的增加和射流与壁面间距的减小，扫掠射流的换热量增加。AtRe= 5000和10，000，与圆形射流相比，清扫射流在喷嘴附近区域表现出较低的传热（即，x/D< 4），但在远区性能略高。在Re = 15，000时，然而，在H/D= 0.5和1.0时，它在整个域中表现出改善的性能，在停滞区周围最大增强40%。总体而言，在高雷诺数和窄间距的情况下，扫掠射流可以提供比圆形射流更优越的上级性能。
Sweeping jet, featuring with temporally continuous and spatially oscillating flow, has attracted a large amount of attention. In the present study, the heat transfer and flow characteristics of a sweeping jet impinging at narrow spacings were investigated. Effects of Reynolds number (i.e.,Re= 5000, 10,000, 15,000) and jet-to-wall spacing (i.e.,H/D= 0.5, 1.0, 2.0, 3.0) on heat transfer were quantified extensively by using the TSP technique. A high-resolution Particle Image Velocimetry (PIV) system was applied to correlate the heat transfer results with the flow fields pertinent to jet impingements. The heat transfer of sweeping jet was found to increase as the Reynolds number increased and as the jet-to-wall spacings decreased. AtRe= 5000 and 10,000, compared to the circular jet, the sweeping jet demonstrated a lower heat transfer in the near-nozzle regions (i.e.,x/D< 4) but slightly higher performance in the far regions. AtRe= 15,000, however, it exhibited an improved performance across the domain atH/D= 0.5 and 1.0, with a maximum of 40% enhancement around the stagnation region. In general, the sweeping jet could provide superior performance to the circular jet at high Reynolds number and narrow spacing.
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DOI：
10.1016/j.ijheatfluidflow.2018.03.017
发表时间：
2018-06
影响因子：
2.6
作者：
Chuangxin He;Yingzheng Liu
通讯作者：
Chuangxin He;Yingzheng Liu
影响因子：
5.2
作者：
D. Lytle;B. W. Webb
通讯作者：
D. Lytle;B. W. Webb
DOI：
10.1016/j.ijheatmasstransfer.2018.04.016
发表时间：
2018-09
影响因子：
5.2
作者：
Tongil Park;Kursat Kara;Daegyoum Kim
通讯作者：
Tongil Park;Kursat Kara;Daegyoum Kim
影响因子：
--
作者：
Camci, C;Herr, F
通讯作者：
Herr, F
影响因子：
1.7
作者：
A. Terzis;P. Ott;J. Wolfersdorf;B. Weigand;M. Cochet
通讯作者：
A. Terzis;P. Ott;J. Wolfersdorf;B. Weigand;M. Cochet