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
  • [21] Experimental investigation on heat transfer from square jets issuing from perforated nozzles
    Pullarao Muvvala
    C. Balaji
    S. P. Venkateshan
    Heat and Mass Transfer, 2017, 53 : 2363 - 2375
  • [22] EXPERIMENTAL INVESTIGATION OF FLOW AND HEAT TRANSFER FOR SINGLE AND MULTIPLE ROWS OF CIRCULAR JETS IMPINGING ON A CONCAVE SURFACE
    Kumar, B. V. N. Rama
    Prasad, B. V. S. S. S.
    PROCEEDINGS OF THE ASME TURBO EXPO 2008, VOL 4, PTS A AND B, 2008, : 921 - 929
  • [23] EXPERIMENTAL STUDIES OF HEAT-TRANSFER BY SLOT JET AND SINGLE TRIPLE ROW OF ROUND JETS IMPINGING ON SEMICYLINDRICAL CONCAVE SURFACES
    BRAHMA, RK
    PADHY, I
    PRADHAN, B
    HEAT TRANSFER ENGINEERING, 1994, 15 (04) : 66 - 74
  • [24] Heat Transfer and Flow Characteristics of Fluid Jets Impinging on a Surface with Cavities
    Chandratilleke, Tilak T.
    King, Andrew J. C.
    Narayanaswamy, R.
    JOURNAL OF ENHANCED HEAT TRANSFER, 2010, 17 (03) : 223 - 229
  • [25] Effects of elliptical pin-fins on heat transfer characteristics of a single impinging jet on a concave surface
    Ravanji, Abdolvahab
    Zargarabadi, Mehran Rajabi
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2020, 152 (152)
  • [26] PARAMETRIC STUDY AND OPTIMIZATION OF STAGGERED INCLINED IMPINGING JETS ON A CONCAVE SURFACE FOR HEAT TRANSFER AUGMENTATION
    Heo, Man-Woong
    Lee, Ki-Don
    Kim, Kwang-Yong
    NUMERICAL HEAT TRANSFER PART A-APPLICATIONS, 2012, 61 (06) : 442 - 462
  • [27] Simulation of Heat Transfer from Hot-Air Jets Impinging a Three-Dimensional Concave Surface
    Fregeau, Mathieu
    Gabr, Mohammad
    Paraschivoiu, Ion
    Saeed, Farooq
    JOURNAL OF AIRCRAFT, 2009, 46 (02): : 721 - 726
  • [28] Heat transfer distribution on a cylindrical convex surface due to obliquely impinging row of circular jets
    Abraham, Satyanand
    Vedula, Rajendra P.
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2019, 137 : 751 - 764
  • [29] Heat transfer rate of swirling impinging jets issuing from a twisted tetra-lobed nozzle
    Wongcharee, Khwanchit
    Kunnarak, Kengkla
    Chuwattanakul, Varesa
    Eiamsa-ard, Smith
    CASE STUDIES IN THERMAL ENGINEERING, 2020, 22
  • [30] Heat transfer rate of swirling impinging jets issuing from a twisted tetra-lobed nozzle
    Wongcharee, Khwanchit
    Kunnarak, Kengkla
    Chuwattanakul, Varesa
    Eiamsa-Ard, Smith
    Chuwattanakul, Varesa (varesaatkmitl@gmail.com), 1600, Elsevier Ltd (22):
12345