Heat transfer characteristics of single row of jets issuing from screw-thread nozzles impinging on a concave surface

被引：8
|
作者：
Xu, Liang [1 ]
Yun, Xue [1 ]
Xi, Lei [1 ]
Gao, Jianmin [1 ]
Yang, Tao [1 ]
Li, Yunlong [1 ]
机构：
[1] Xi An Jiao Tong Univ, Sch Mech Engn, State Key Lab Mfg Syst Engn, Xian 710049, Shaanxi, Peoples R China
来源：
CASE STUDIES IN THERMAL ENGINEERING | 2021年 / 28卷
基金：
中国国家自然科学基金;
关键词：
Swirling impinging jets; Impingement cooling; Single row of jets; Concave target surface; SLOT JET; IMPINGEMENT; CURVATURE; PRESSURE; RATIO; ANGLE; FLOW;
D O I：
10.1016/j.csite.2021.101590
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Based on the combination of experiment and numerical analysis, the heat transfer characteristics of single row of swirling jets impinging on a concave semi-cylindrical surface are studied. The effects of nozzle shape, jet pitch (c/D = 4, 6, 8), swirl number (S = 0.15, 0.32, 0.56) and impinging distance (H/D = 2, 3, 4, 5) are investigated. For the single row of impinging jets, the entrainment vortices enhance the flushing on the target, and the backflow vortices increase gradually along the vertical direction with the increase of c/D. The average Nusselt number (Nu(ave)) of the swirling impinging jet (SIJ) is higher than that of the conventional round impinging jet (CIJ) under the same conditions. With the increase of the c/D, the Nu(ave(s)) in the circumferential direction and the Nu(ave(x)) in the axial direction decrease. Compared with c/D = 8, the Nu(ave(x)) of the SIJ is 13.4% higher than that of c/D = 4 under the same test conditions. In addition, S has a weak effect on the Nu distribution of the SIJ. With the increase of the H/D, the Nu(ave(s)) and the Nu(ave(x)) both decrease. The Nu(ave(s)) and Nu(ave(x)) for H/D = 5 are both about 5% higher than those for H/D = 2.
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页数：15
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