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Investigation of stagnation flow heat transfer for a heated horizontal round plate

机译：水平加热圆板的滞流传热研究

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摘要

The heat transfer characteristics in stagnation flow are investigated through three cases in this study. The first is forced convection by an array of air jets; the second is free convection of a downward-facing heated round plate; the third is free convection of an upward-facing heated round plate.;The first case is investigated by systematic experiments which examine the heat transfer characteristics mainly by five air jets impinging normally to a flat plate, with varying nozzle diameters, and Reynolds numbers, at different distances between the nozzles and the plate. The empirical formulas of heat transfer around the stagnation point and over the entire plate are established. Compared to the single jet cooling, the Nusselt numbers do not increase significantly by increasing the numbers of jets.;The second case is a theoretical study. The analytical solutions for the velocity and the temperature profiles, using the Prandtl number in the moderate range, have been obtained through the similarity transformation of the governing equations applicable to laminar flow. The Nusselt number expression is found to be a function of the 1/4 power of the Rayleigh number, for the prescribed surface temperature condition; and a function of the 1/5 power of the modified Rayleigh number, for the prescribed surface flux condition.;The third case is formulated by a mathematical model similar to the second case; however, the analytical solutions for the velocity and the temperature profiles have not been obtained. Yet, the Nusselt number expression from the model shows the 1/4 power dependence on the Rayleigh number, which agrees with the results of the second approach and with experimental findings.
机译：本研究通过三种情况研究了滞流中的传热特性。第一种是通过一系列的喷气强制对流；第二个是向下加热的圆盘的自由对流。第三种是向上加热的圆板的自由对流。第一种情况是通过系统实验研究的，该实验主要通过五个正常喷射到平板上的空气喷嘴（具有不同的喷嘴直径和雷诺数）来检查传热特性，在喷嘴和板之间的不同距离处。建立了在停滞点附近和整个平板上传热的经验公式。与单喷嘴冷却相比，通过增加喷嘴数量，Nusselt数量不会显着增加。第二种情况是理论研究。通过适用于层流的控制方程的相似变换，获得了在中等范围内使用Prandtl数的速度和温度曲线的解析解。对于规定的表面温度条件，发现Nusselt表达式是瑞利数的1/4幂的函数。在规定的表面通量条件下，该函数是修正瑞利数的1/5幂的函数。但是，尚未获得速度和温度曲线的解析解。然而，模型中的Nusselt数表达式显示了1/4功率对瑞利数的依赖性，这与第二种方法的结果和实验结果相吻合。

著录项

  • 作者

    Wei, Ching-Hua.;

  • 作者单位

    New Jersey Institute of Technology.;

  • 授予单位 New Jersey Institute of Technology.;
  • 学科 Mechanical engineering.
  • 学位 Ph.D.
  • 年度 1991
  • 页码 205 p.
  • 总页数 205
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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