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首页> 外文学位 >EXPERIMENTAL INVESTIGATION OF CONVECTIVE HEAT TRANSFER IN A TRANSITIONAL CHANNEL FLOW WITH PERIODIC CAVITY INDUCED ROUGHNESS.
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EXPERIMENTAL INVESTIGATION OF CONVECTIVE HEAT TRANSFER IN A TRANSITIONAL CHANNEL FLOW WITH PERIODIC CAVITY INDUCED ROUGHNESS.

机译：周期性腔流引起的粗糙度的过渡通道内对流换热的实验研究。

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摘要

An experimental investigation of forced convective heat transfer is reported for a transitional channel flow. One channel wall is formed by repeating surface mounted ribs. Cavities formed in between the ribs provide a surface roughness. The effect of variations in the channel wall-to-wall spacing, the rib-to-rib spacing and flow rate have been studied. The resulting flow and thermal fields, in the vicinity of a single heated rib, are discussed. Investigation of the flow field consisted of a flow visualization study, measurements of axial pressure variation and measurements of the mean and rms axial velocity profile. The disturbance level in the roughness layer, adjacent to the surface, increases with rib-to-rib spacing.;Local measurements of the surface temperature rise, convective heat flux and transverse temperature profile were obtained using a Mach-Zehnder interferometer. Variation of the local conductance with axial postion is similar to that of a laminar smooth wall flow. Transverse temperature profiles display similarity when the transverse coordinate is normalized by the thermal boundary layer thickness. The average convective resistance is well correlated with a Reynolds number based on the rib length using a power law. The effect of the volume average velocity on the average convection rate is dominant; geometry variations produce secondary effects. At small rib-to-rib spacing the convection rate is the same as for a smooth wall transitional flow. At large rib-to-rib spacing a change from a roughness independent to a roughness dependent regime occurs as flow rate increases. In the latter regime the "turbulent" transport is enhanced as increases in the rib-to-rib spacing increase the roughness.
机译：据报道，对流换热实验是对流换热的实验研究。一个通道壁是通过重复安装表面肋来形成的。肋之间形成的腔提供了表面粗糙度。研究了通道壁间距，肋骨至肋骨间距和流速变化的影响。讨论了在单个加热肋条附近产生的流场和热场。流场的研究包括流动可视化研究，轴向压力变化的测量以及均方根值和均方根轴向速度分布图的测量。与表面相邻的粗糙层中的干扰水平随肋骨到肋骨的间距而增加。;使用马赫曾德尔干涉仪获得了表面温度升高，对流热通量和横向温度分布的局部测量值。带有轴向位置的局部电导的变化类似于层状光滑壁流的变化。当通过热边界层厚度归一化横向坐标时，横向温度曲线显示出相似性。平均对流阻力与基于肋长的幂律的雷诺数很好地相关。体积平均速度对平均对流速率的影响占主导地位；几何形状变化会产生次要效果。在较小的肋骨到肋骨间距下，对流速率与平滑的壁过渡流相同。在较大的肋到肋间距下，随着流速的增加，会发生从粗糙度到依赖于粗糙度的变化。在后一种情况下，随着肋骨到肋骨间距的增加，粗糙度增加了“湍流”传输。

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  • 作者

    LEHMANN, GARY L.;

  • 作者单位

    Clarkson University.;

  • 授予单位 Clarkson University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1985
  • 页码 168 p.
  • 总页数 168
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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