• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >FLOW VISUALIZATION AND AIR TEMPERATURE MEASUREMENTS IN SYMMETRICALLY HEATED VERTICAL CHANNELS WITH ADIABATIC EXTENSIONS
【24h】

FLOW VISUALIZATION AND AIR TEMPERATURE MEASUREMENTS IN SYMMETRICALLY HEATED VERTICAL CHANNELS WITH ADIABATIC EXTENSIONS

机译：带有绝热扩展的对称加热垂直通道中的流动可视化和空气温度测量

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

Air natural convection in a vertical channel-chimney system with the channel walls symmetrically heated at a uniform heat flux has been experimentally investigated. Flow visualization photographs and average air temperatures are presented. Some profiles of air temperature fluctuations are reported, which point out the fluid flow interactions in the chimney. The flow visualization showed that the cold air inflow penetrating into the chimney affects the thermal performance of the channel. The improvement in the thermal performance of the channel determined by the chimney effect, for various values of the process parameters, has also been pointed out. In all investigated configurations and ranges of the process parameters the air flow in the channel was laminar. The flow in the chimney is strongly affected by the aspect ratio. Moreover, at the lower values of the expansion ratio the flow was laminar in the chimney and in its lower corner a stable vortex was noticed whereas at larger values of the expansion ratio a cold ambient air downflow worsened the thermal performance of the system. Interactions between the thermal plume arising from the channel, the vortex in the corner in the inlet chimney region and the cold air inflow yield fluctuations in the air temperature in the system. The distribution of time averaged air temperature in the cross sections validates indications given by the flow visualization in the chimney.
机译：实验研究了垂直通道-烟囱系统中的空气自然对流，其中通道壁以均匀的热通量对称加热。提供了流动可视化照片和平均气温。报告了一些空气温度波动的曲线，指出了烟囱中的流体流动相互作用。流动可视化显示，进入烟囱的冷空气流入会影响通道的热性能。还指出了对于各种工艺参数值，由烟囱效应确定的通道的热性能的改善。在所有调查的配置和工艺参数范围内，通道中的气流均为层流。烟囱中的流量受纵横比的影响很大。此外，在较低的膨胀比值下，烟囱中的气流呈层流状，在其下角处观察到了稳定的涡流，而在较大的膨胀比值下，冷的环境空气向下流动会恶化系统的热性能。由通道产生的热羽流，入口烟囱区域拐角处的涡旋和冷空气流入之间的相互作用会导致系统中空气温度的波动。截面中时间平均气温的分布验证了烟囱中流动可视化给出的指示。

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