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首页> 外文期刊>International Journal of Heat and Fluid Flow >Jet impingement heat transfer of a lobed nozzle: Measurements using temperature-sensitive paint and particle image velocimetry
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Jet impingement heat transfer of a lobed nozzle: Measurements using temperature-sensitive paint and particle image velocimetry

机译：叶片喷嘴的射流冲击传热：使用热敏涂料和颗粒图像测速仪进行的测量

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摘要

The impingement jet issuing from the lobed nozzles constructed using three small circular orifices is intensively investigated; the heat transfer characteristics and flow fields are respectively determined using temperature sensitive paint (TSP) and particle image velocimetry (PIV). A piece of fluorine-doped tin oxide (FTO)-coated glass with uniform wall heat flux is used for optical access in TSP measurements. In particular, the effects of the geometrical variations are compared by varying the ratio of the orifice centre offset to the orifice radius, i.e., a/b = 0, 0.5, 0.8, 1.0, 1.1 and 1.15, at a constant equivalent diameter D-e for all configurations to ensure a constant cross-section area of the nozzles. The TSP measurements of the impingement heat transfer at Reynolds numbers Re = 10,000 and 40,000 are performed using different nozzle-to-wall distances, i.e., H/D-e=2, 4 and 6, to determine the mean Nusselt number distribution on the heated wall. The results show that the heat transfer is enhanced using lobed jets at H/D-e = 4. At H/D-e=2, the optimal Nusselt number is obtained using a lobed nozzle a/b = 0.8 in the region 1 r/D-e 4, with a heat transfer enhancement of up to 10% compared with that in the case of a circular jet. At H/D-e= 4, the azimuthal-averaged Nusselt number increases (up to 16%) consistently in the region r/De 0.5 with an increase in a/b, while the Nusselt number shows a slight decay in the region 2 r/D-e 4. However, at H/D-e = 6, the Nusselt number in the entire measured region decays with an increase in a/b. Finally, the PIV measurements of the flow fields at Re = 10,000 are performed at H/D-e= 2 and 4 and a/b = 0, 0.8 and 1.15. The results show that the heat transfer enhancement can be attributed to the increased turbulence level in the wall-jet zone at H/D-e= 2 and in the stagnation region at H/D-e= 4.
机译：深入研究了从使用三个小圆形孔构成的叶片喷嘴射出的冲击射流。传热特性和流场分别使用热敏涂料（TSP）和颗粒图像测速仪（PIV）确定。在TSP测量中，一块具有均匀壁热通量的掺氟氧化锡（FTO）涂层玻璃用于光学访问。特别地，通过以恒定的等效直径De改变孔中心偏移与孔半径的比率，即a / b = 0、0.5、0.8、1.0、1.1和1.15，来比较几何变化的影响。所有配置均可确保喷嘴的横截面积恒定。雷诺数Re = 10,000和40,000时冲击传热的TSP测量是使用不同的喷嘴到壁的距离（即H / De = 2、4和6）进行的，以确定加热后壁上的平均努塞尔数分布。结果表明，在H / De <= 4时，使用带叶片的射流可以增强热传递。在H / De = 2时，使用带叶片的喷嘴a / b = 0.8可以在1

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  • 来源
    《International Journal of Heat and Fluid Flow》 |2018年第6期|111-126|共16页
  • 作者

    He Chuangxin; Liu Yingzheng;

  • 作者单位

    Shanghai Jiao Tong Univ, Sch Mech Engn, Educ Minist Power Machinery & Engn, Key Lab, 800 Dongchuan Rd, Shanghai 200240, Peoples R China;

    Shanghai Jiao Tong Univ, Sch Mech Engn, Educ Minist Power Machinery & Engn, Key Lab, 800 Dongchuan Rd, Shanghai 200240, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Impinging jet; Lobed nozzle; Heat transfer; TSP; PIV;

    机译：射流;喷嘴裂;传热;TSP;PIV;

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