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首页> 外文期刊>Journal of Heat Transfer >Flow and Heat Transfer Characteristics of Single Jet Impinging on Dimpled Surface
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Flow and Heat Transfer Characteristics of Single Jet Impinging on Dimpled Surface

机译：冲击表面上单射流的流动和传热特性

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摘要

Based on combined particle image velocimetry (PIV) and numerical simulation, the flow and heat transfer characteristics of a single jet impinging on a dimpled surface for D_j/ D = 0.318, 0.5, 1.045; δ/D = O.1, 0.2, 0.3; Re_j = 5000, 10,000, 23,000, were investigated for the first time. The distance between jet nozzle and plate was fixed and equal to H/D = 2. The results show that the flow structures of the single jet impingement with dimpled target surface can be summarized into three typical conceptual flow structures. Particularly, the third flow structure in the form of a large toroidal vortex bound up with the dimple is the result of the centrifugal force of the flow deflection at the stagnation region and spherical centrifugal force of the deep dimple surface. The heat transfer area increases when the dimple relative depth increases. For the cases of D_j/D = 0.318 and 0.5, the area increasing dominate the heat transfer process, and the average Nusselt number increases with the increasing of dimple relative depth. For the cases with D_j/D = 1.045, the local Nusselt number reduction dominate the heat transfer process, the average Nusselt number decreases with the increasing of dimple relative depth. The average Nusselt number of the D_j/D = 0.318 and 0.5 cases is larger than the baseline case, while those of the D_j/D = 1.045 cases are smaller than the baseline case. Furthermore, the correlative expressions of the local Nusselt number, stagnation points Nusselt number and average Nusselt number are obtained.
机译：基于组合粒子图像测速（PIV）和数值模拟，D_j / D = 0.318、0.5、1.045时，单个射流撞击在凹坑表面的流动和传热特性； δ/ D ＝ 0.1、0.2、0.3； Re_j = 5000、10,000、23,000，这是首次调查。喷嘴与板之间的距离是固定的，等于H / D =2。结果表明，带有目标表面凹坑的单次喷射撞击的流动结构可以概括为三种典型的概念流动结构。特别地，以凹痕束缚的呈大环形涡旋形式的第三流动结构是滞流区域处的流动偏转的离心力和深凹痕表面的球形离心力的结果。当凹坑的相对深度增加时，传热面积增加。对于D_j / D = 0.318和0.5的情况，面积增加在传热过程中起主导作用，平均Nusselt数随凹坑相对深度的增加而增加。对于D_j / D = 1.045的情况，局部Nusselt数量减少主导了传热过程，平均Nusselt数量随着酒窝相对深度的增加而减小。 D_j / D = 0.318和0.5例的平均Nusselt数大于基线例，而D_j / D = 1.045例的平均Nusselt数小于基线例。此外，获得了局部努塞尔特数，停滞点努塞尔特数和平均努塞尔特数的相关表达式。

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  • 来源
    《Journal of Heat Transfer》 |2013年第5期|052201.1-052201.15|共15页
  • 作者

    Yonghui Xie; Ping Li; Jibing Lan; Di Zhang;

  • 作者单位

    Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China;

    Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China;

    Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China;

    Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, 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

    single impinging jet; dimple; flow structures; heat transfer; PIV; numerical simulation;

    机译：单撞击射流;酒窝;流动结构;传播热量;PIV;数值模拟;

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