...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physics of fluids >The evolution of the boundary layer in turbulent Rayleigh-Benard convection in air
【24h】

The evolution of the boundary layer in turbulent Rayleigh-Benard convection in air

机译：空气中湍流瑞利-贝纳德对流边界层的演变

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We report measurements of the near-wall flow field in turbulent Rayleigh-Benard convection in air (Pr = 0.7) using particle image velocimetry. The measurements were performed in a thin, rectangular sample at fixed Rayleigh number Ra = 1.45 x 10(10). In particular, we focus on the evolution of the boundary layer that a single convection roll generates along its path at the lower horizontal plate. We identify three specific flow regions along this path: (i) a region of wall-normal impingement of the down flow close to one corner of the sample, (ii) a region where a shear layer with almost constant thickness evolves, and (iii) a region in which this boundary layer grows and eventually detaches from the plate surface at the opposite corner of the sample. Our measurements with a spatial resolution better than 1/500 of the total thickness of the boundary layer show that the typical velocity field as well as its statistics qualitatively varies between the three flow regions. In particular, it could be verified that the shear layer region covering about 75% of the total area of the plate is in transition to turbulence at the Rayleigh number as low as investigated in the present work. Published by AIP Publishing.
机译：我们使用粒子图像测速仪报告了在空气中湍流瑞利-贝纳德对流（Pr = 0.7）中近壁流场的测量结果。在固定的瑞利数Ra = 1.45 x 10（10）的矩形样品中进行测量。特别是，我们专注于单个对流辊在下部水平板上沿其路径生成的边界层的演变。我们沿着这条路径确定了三个特定的流动区域：（i）靠近样品一个角的向下流动的壁法向冲击区域，（ii）厚度几乎恒定的剪切层演化的区域，以及（iii） ）边界层生长并最终从样品相对角的平板表面脱离的区域。我们的空间分辨率优于边界层总厚度的1/500的测量结果表明，典型的速度场及其统计数据在三个流动区域之间发生了质的变化。尤其是，可以证实，在瑞利数下，覆盖板总面积约75％的剪切层区域正在向湍流过渡，如本工作中所研究的那样低。由AIP Publishing发布。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号