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首页> 外文期刊>Journal of Heat Transfer >Heat Transfer Due to an Impinging Jet in a Confined Space
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Heat Transfer Due to an Impinging Jet in a Confined Space

机译：在密闭空间中因射流撞击而传热

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摘要

A numerical investigation using unsteady three-dimensional Reynolds-averaged Navier-Stokes (RANS) equations with the k-ω SST (shear stress transport) turbulent model was conducted to determine the flow and thermal characteristics of an unsubmerged axisym-metric oil jet in air, impinging normally on to a heated flat disk with finite radius, bounded by cylindrical walls kept at constant temperature. A 10 mm thick disk subjected to a high uniform heat flux was located at impingement distances ranging from 40 to 80 mm from the nozzle exit, for nozzle exit diameters of d = 1.0, 2.0, and 4.0 mm. The volume of fluid (VOF) method with a high-resolution interface-capturing (HRIC) scheme was implemented in STAR-CCM+. A new methodology was developed to predict the stagnation zone and local heat transfer coefficients. Contrary to previous research, it is shown that the radial extent of the stagnation zone is not fixed but depends on the gradient of radial velocity along the disk. The normalized local Nusselt number profile along the disk radius is found to be weakly dependent on Reynolds number for a given nozzle size. It is also shown that the local Nusselt number is not uniform in the stagnation region as reported by experimental studies but depends on the distribution of the near-wall radial velocity gradient. Using the computational results, new correlations to predict the dimensionless radial velocity gradient and Nusselt number have been developed. The present correlations are dimensionally balanced, eliminating a deficiency in earlier correlations noted in the literature.
机译：使用非稳态三维雷诺平均Navier-Stokes（RANS）方程和k-ωSST（剪切应力传递）湍流模型进行了数值研究，以确定空气中非浸没轴对称油射流的流动和热特性通常会撞击到半径有限的加热平板上，并以保持恒温的圆柱壁为界。将10 mm厚的圆盘承受较高的均匀热通量，其距喷嘴出口的撞击距离为40至80 mm，喷嘴出口直径d = 1.0、2.0和4.0 mm。在STAR-CCM +中实现了具有高分辨率接口捕获（HRIC）方案的流体体积（VOF）方法。开发了一种新方法来预测停滞区和局部传热系数。与先前的研究相反，表明停滞区的径向范围不是固定的，而是取决于沿磁盘的径向速度的梯度。发现在给定的喷嘴尺寸下，沿圆盘半径的归一化局部Nusselt数轮廓几乎不依赖于雷诺数。还表明，如实验研究所报道的那样，局部Nusselt数在停滞区域不是均匀的，而是取决于近壁径向速度梯度的分布。利用计算结果，已经开发了预测无量纲径向速度梯度和Nusselt数的新的相关性。当前的相关性在尺寸上是平衡的，从而消除了文献中提到的早期相关性的不足。

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  • 来源
    《Journal of Heat Transfer》 |2014年第11期|112202.1-112202.10|共10页
  • 作者

    G. Nasif; R. M. Barron; R. Balachandar;

  • 作者单位

    Department of Mechanical, Automotive and Materials Engineering, University of Windsor, Windsor, ON N9B 3P4, Canada;

    Department of Mechanical, Automotive and Materials Engineering, University of Windsor, Windsor, ON N9B 3P4, Canada;

    Department of Mechanical, Automotive and Materials Engineering, University of Windsor, Windsor, ON N9B 3P4, Canada;

  • 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

    jet impingement; VOF; stagnation zone; velocity gradient; Nusselt number;

    机译：射流冲击VOF;停滞区;速度梯度努塞尔数;

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