...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Flow Visualization and Image Processing >OBSERVATION OF THERMALS IN MIXED CONVECTIVE GAS FLOW OVER A MODEL HEATED SUBSTRATE
【24h】

OBSERVATION OF THERMALS IN MIXED CONVECTIVE GAS FLOW OVER A MODEL HEATED SUBSTRATE

机译：模型加热基体上混合对流气流中热的观测

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

Experimental flow visualization has been carried out to investigate the characteristics of thermals and their relation to the evolution of longitudinal roll patterns in mixed convection of air over a circular heated plate mounted on the bottom of a horizontal flat duct. The results reveal that thermals with three different appearances are observed in the progression of end view flow photos, namely, the knotted thermals situated slightly beyond the onset point, the subsequent mushroom-shape thermals in the core region of the duct, and the deformed thermals located at each far side of lateral extension upon the heated plate. It is noted that on top of the heated surface, regular thermals arrange in unequal distance and lose their spanwise symmetry slightly. Moreover, the onset points of thermals all land on the circular heated disk and are in a shape of a concave downward curve in the flow direction. At higher buoyancy the generated knotted thermals unsteadily oscillate up and down and move spanwisely in the region slightly beyond the onset point which in turn results in meandering of the smoke streaks on top view accompanied by the bifurcation points of rising thermals to move back and forth in the axial direction. This explains the snaking motion proposed in the literature. Besides, coexistence and new generation of thermals are observed in the intermittent transition.
机译：已经进行了实验流动可视化，以研究热的特性及其与安装在水平扁平管道底部的圆形加热板上的空气混合对流中纵向滚动模式演变的关系。结果表明，在端视图流动照片的进程中观察到具有三种不同外观的热，即打结的热稍微位于起始点之外，随后在管芯区域出现蘑菇状的热，以及变形的热。位于加热板上横向延伸的每个远端。注意，在加热表面的顶部，规则的热量以不相等的距离排列，并略微失去其翼展方向对称性。而且，热的起始点全部落在圆形加热盘上，并且在流动方向上呈向下凹的向下弯曲的形状。在较高的浮力下，产生的打结的热不稳定地上下波动，并在该区域内跨度移动，稍微超过起始点，这继而导致在顶视图上出现烟雾条纹，并伴随着上升的热的分叉点来回移动。轴向。这解释了文献中提出的蛇行动作。此外，在间歇过渡中观察到共存和新的热学现象。

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