• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental and numerical investigations of slot jet impingement with and without a semi-circular bottom confinement
【24h】

Experimental and numerical investigations of slot jet impingement with and without a semi-circular bottom confinement

机译：有和没有半圆形底部约束的缝隙射流冲击的实验和数值研究

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

In this paper, the details of experimental and numerical investigations of slot air jet impingement cooling of a circular heated cylinder have been presented. To improve heat transfer rate behind the cylinder, a semi-circular confinement is also considered. In the parametric study, the Reynolds number Re_D, defined based on the cylinder diameter D, is varied from 6000 to 20,000. The ratio of the spacing between the nozzle exit and the heated cylinder H to the width S of the nozzle, H/S is varied from 2 to 12 and the non-dimensional parameter, the diameter of the target to the slot width, D/S = 5.5, 8.5 and 17 are considered. To understand the effect of the bottom flow confinement, the ratio of the confinement radius R_c to the radius R, of the heated cylinder, R_c/R was varied from 1.7 to 3.7 and the ratio of the width of the bottom opening W of the confinement to the radius of the heated cylinder, W/R is varied from 0 to 1.2. Numerical simulations are carried out using the v~(′2)‾-f model to obtain the flow pattern and temperature distribution over the cylinder and in the fluid region. In the case of jet impingement flow with a semi-circular confinement wall behind the target cylinder, after the flow separation from the cylinder, the heated fluid is diverted towards the inner wall of the confinement. The major part of the diverted hot fluid leaves through the opening provided at the bottom of the flow confinement without a direct contact with the bottom surface of the heated cylinder. In the case of smaller size semi-circular confinement walls, R_c/R = 1.7 and 2.6, the strength of recirculation is higher than that of the unconfined flow and the flow with a larger size confinement. Hence, the local Nusselt number values are higher at the bottom surface of the heated cylinder when smaller size semi-circular confinement walls are used behind the cylinder.
机译：在本文中，详细介绍了圆形加热气缸缝隙空气射流冲击冷却的实验和数值研究的细节。为了提高圆柱体后面的传热率，还考虑了半圆形的限制。在参数研究中，基于圆柱直径D定义的雷诺数Re_D从6000到20,000不等。喷嘴出口和加热的圆筒H之间的间距与喷嘴的宽度S之比H / S在2到12之间变化，并且无量纲参数，目标的直径与槽口宽度D /考虑S = 5.5、8.5和17。为了理解底部流动限制的效果，将限制半径R_c与加热圆柱体的半径R之比R_c / R从1.7更改为3.7，并限制底部开口W的宽度比对于加热的圆柱体的半径，W / R在0到1.2之间变化。使用v〜（'2）‾-f模型进行数值模拟，以获取圆柱体上和流体区域中的流动模式和温度分布。如果在目标圆柱体后面有半圆形限制壁的情况下发生射流冲击流，则在与圆柱体分离后，加热后的流体会朝着限制壁的内壁转移。转移的热流体的主要部分通过设置在流量限制装置底部的开口离开，而没有与加热缸的底面直接接触。在较小尺寸的半圆形限制壁的情况下，R_c / R = 1.7和2.6，再循环强度高于无限制流动和更大尺寸限制的流动。因此，当在圆柱体后面使用较小尺寸的半圆形限制壁时，在加热圆柱体的底表面处的局部Nusselt值较高。

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