...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Flow patterns and hydrodynamic model for gas-liquid co-current downward flow through an orifice plate
【24h】

Flow patterns and hydrodynamic model for gas-liquid co-current downward flow through an orifice plate

机译：通过孔板的气液循环向下流动的流动模式和流体动力学模型

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

Gas-liquid co-current downward flow through an orifice plate was experimentally investigated, in which the surface tension, gravity, gas-liquid interface friction force and fluid inertial force may have comparable effects on the flow of the liquid. In experiments, nine orifice plates with different hole-diameter and thickness were used, the gas superficial mass flux changes from 1.7 to 41.4 kg/m(2)/s and the liquid superficial mass flux is from 38.7 to 295.3 kg/m(2)/s. Four flow patterns, namely, trickling, continuous, semi-dispersed and perfect-dispersed flow were identified by means of observation. Flow pattern maps were plotted using gas superficial mass flux vs. liquid superficial mass flux, and the transition mechanism of different flow patterns and the influence of the hole-diameter on the transition boundaries were discussed. Also, a statistical parameter was used to assist in understanding the transition mechanism from trickling/continuous flow to semi-dispersed flow. Next, by considering the interaction between gas and liquid, a model about the film thickness around orifice rim was proposed and the factors influencing the liquid film thickness were discussed. These discussions and the comparisons with the film thickness in the case of gas-liquid annular flow in pipe show that the model is very effective. Based on this model, an equivalent length model for the orifice friction was developed to predict the pressure loss of gas-liquid two-phase flow through the orifice, and satisfactory agreement with experimental data was obtained. In addition, by using the equivalent length method, a new correlation was proposed to successfully predict the pressure loss of single gas phase flow through the orifice plate.
机译：通过孔板通过孔板的气体液相向下流动进行实验研究，其中表面张力，重力，气液界面摩擦力和流体惯性力可以对液体的流动具有相当的影响。在实验中，使用具有不同空穴直径和厚度的九个孔板，气体浅表质量通量从1.7〜41.4 kg / m（2）/ s变化，液体浅表质量磁通量为38.7至295.3kg / m（2 / s。通过观察确定四个流动模式，即滴流，连续，半分散和完美分散的流动。讨论了流量图案映射，使用气体浅表磁通与液体浅表质量磁通，并讨论了不同流动模式的过渡机制和孔直径对转变边界的影响。而且，使用统计参数来帮助理解转变机制从滴流/连续流到半分散的流动。接下来，通过考虑气体和液体之间的相互作用，提出了关于孔边缘周围的膜厚度的模型，并讨论了影响液体膜厚度的因素。这些讨论和与膜厚度的比较在管道中的气液环形流动的情况下，模型非常有效。基于该模型，开发了一种用于孔摩擦的等效长度模型，以预测通过孔口的气液两相流的压力损失，并获得与实验数据的令人满意的协议。另外，通过使用等效的长度方法，提出了一种新的相关性以成功地预测通过孔板的单个气相流的压力损失。

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