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.
引用
收藏
页数：15
相关论文
共 50 条
  • [31] Heat transfer and flow characteristics of impinging jet on a concave surface at small nozzle to surface distances
    Hadipour, Amirhosein
    Zargarabadi, Mehran Rajabi
    APPLIED THERMAL ENGINEERING, 2018, 138 : 534 - 541
  • [32] Heat transfer from a moving surface due to impinging slot jets
    Chattopadhyay, H
    Biswas, G
    Mitra, NK
    JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 2002, 124 (03): : 433 - 440
  • [33] Flow and heat transfer characteristics of a swirling impinging jet issuing from a threaded nozzle
    Xu, Liang
    Yang, Tao
    Sun, Yanhua
    Xi, Lei
    Gao, Jianmin
    Li, Yunlong
    Li, Jibao
    CASE STUDIES IN THERMAL ENGINEERING, 2021, 25
  • [34] Heat transfer and fluid flow of swirling impinging jets ejected from nozzles with different twisted tapes
    Nasirzadeh, Hamid
    Yazdi, Mohammad Eftekhari
    Lavasani, Arash Mirabdolah
    JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING, 2022, 44 (11)
  • [35] Heat transfer of swirling impinging jets ejected from Nozzles with twisted tapes utilizing CFD technique
    Amini, Younes
    Mokhtari, Mojtaba
    Haghshenasfard, Masoud
    Gerdroodbary, M. Barzegar
    CASE STUDIES IN THERMAL ENGINEERING, 2015, 6 (06) : 104 - 115
  • [36] NUMERICAL MODELLING OF FLOW AND HEAT TRANSFER FROM AN ARRAY OF JETS IMPINGING ONTO A CONCAVE SURFACE UNDER STATIONARY AND ROTATING CONDITIONS
    Craft, Tim J.
    Iacovides, Hector
    Mostafa, Nor A.
    PROCEEDINGS OF THE ASME TURBO EXPO 2008, VOL 6, PT A, 2008, : 2435 - +
  • [37] Heat transfer and fluid flow of swirling impinging jets ejected from nozzles with different twisted tapes
    Hamid Nasirzadeh
    Mohammad Eftekhari Yazdi
    Arash Mirabdolah Lavasani
    Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2022, 44
  • [38] Heat transfer characteristics of impinging steady and synthetic jets over vertical flat surface
    He, Xin
    Lustbader, Jason A.
    Arik, Mehmet
    Sharma, Rajdeep
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2015, 80 : 825 - 834
  • [39] ON THE HEAT-TRANSFER CHARACTERISTICS OF CONSTRAINED AIR-JETS IMPINGING ON A FLAT SURFACE
    SHOUKRI, M
    CALKA, A
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 1987, 30 (01) : 203 - 205
  • [40] Heat transfer in a channel with inclined target surface cooled by single array of impinging jets
    Al-Hadhrami, Luai M.
    Shaahid, S. M.
    Al-Mubarak, Ali A.
    PROCEEDINGS OF THE ASME TURBO EXPO 2007, VOL 4, PTS A AND B, 2007, : 35 - 42
12345