• 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 >The Emptying-box problem with a baffle of different porosity percentages
【24h】

The Emptying-box problem with a baffle of different porosity percentages

机译：带有不同孔隙率百叶窗的排空箱问题

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

This research studies the Emptying-box problem with a porous baffle just behind the entrance opening. A theoretical model is extended to include the effect of a porous baffle, and the theoretical model taking account of porosity establishes the connections between two typical unidirectional displacement flow types. The salt-bath technique is employed to conduct the experiments using an acrylic reduced-scale model. Dye attenuation technique is used to analyze the light intensity data derived from the recorded images of experiments. According to the baffle porosity percentage (φ), the experiments are categorized into two series, EM(79%) and EM(60%). Each series respectively includes three different opening area ratios, which are 1, 0.5 and 0.33. Experimental results show that emptying processes for the cases with a baffle of the larger porosity percentage consist of emptying the dense layer and emptying the mixed layer, but there is only one process of emptying the dense layer for the cases with a baffle of the smaller porosity percentage. Experimental results are in reasonable agreement with the extended theoretical model developed in this research. Two extreme cases, those with and without an impenetrable baffle, are included in this paper to represent two typical flow types of the horizontal inflow denoted as EM(H), as that with φ = 0%, and the vertical inflow denoted as EM(V), as that with φ = 100%, i.e. the unidirectional classical displacement flow and the displacement flow with interfacial mixing. As the porosity percentage increases, the emptying time for the dense layer decreases, but the emptying time for the whole box tends to increase. The emptying time for the dense layer decreases, when the total effective opening area or the reduced gravity increases for the cases having the same porosity percentage. The initial interfacial height of the mixed layer increases, as the baffle porosity percentage increases for the cases having the fixed total effective opening area, or the total effective opening area increases for the cases with the same baffle porosity percentage. The initial buoyancy of the mixed layer is dependent on the penetrative entrainment flow rate from the dense layer to the mixed layer and the emptying time for the dense layer. As the total effective opening area or the porosity percentage increases, experimental results show that the initial buoyancy of the mixed layer tends to increase, and the penetrative entrainment flow rate increases as well, but the emptying time for the dense layer decreases.
机译：这项研究研究了在入口后面紧接着有多孔挡板的排空箱问题。扩展了理论模型以包括多孔挡板的作用，并且考虑到孔隙率的理论模型建立了两种典型的单向位移流类型之间的联系。盐浴技术用于使用丙烯酸缩尺模型进行实验。染料衰减技术用于分析从实验记录的图像得出的光强度数据。根据挡板孔隙率（φ），将实验分为两个系列，EM（79％）和EM（60％）。每个系列分别包括三个不同的开口面积比，分别为1、0.5和0.33。实验结果表明，孔隙度较大的挡板的排空过程包括排空致密层和排空混合层，而孔隙度较小的挡板的排空过程只有一个过程。百分比。实验结果与本研究开发的扩展理论模型合理吻合。本文包括两种极端情况，带有和不带有不可渗透挡板的情况，代表了两种典型的水平入流类型，水平入流为EM（H），φ= 0％，垂直入流为EM（H）。 V），如φ= 100％，即单向经典位移流和界面混合位移流。随着孔隙率百分比的增加，致密层的排空时间减少，但整个盒子的排空时间趋于增加。当具有相同孔隙率的情况下，总有效开口面积或减小的重力增加时，致密层的排空时间减少。对于总有效开口面积固定的情况，随着隔板孔隙率百分比的增加，或者对于相同的隔板孔隙率百分比的情况，总有效开口面积的增加，混合层的初始界面高度会增加。混合层的初始浮力取决于从致密层到混合层的渗透夹带流速和致密层的排空时间。实验结果表明，随着总有效开口面积或孔隙率的增加，混合层的初始浮力趋于增加，渗透夹带流量也随之增加，但致密层的排空时间却减少了。

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