• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties
【2h】

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

机译：逆流气泡塔流体动力学的综合实验研究：滞留率，流态转变，气泡尺寸分布和局部流动特性

页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this paper, we apply a variety of experimental techniques to investigate the influence of the counter-current mode on bubble column hydrodynamics. We study an air-water bubble column, which is 5.3 m in height and has an inner diameter of 0.24 m, and we consider gas superficial velocities in the range of 0.004-0.20 m/s and liquid superficial velocities up to -0.09 m/s. The experimental investigation consists of holdup, gas disengagement, image analysis and optical probe measurements. The holdup measurements are compared with the literature and are used to investigate the flow regime transition. The gas disengagement measurements are used to further investigate the flow regime transition and study the structure of the holdup curve. The image analysis is used to study the bubble shapes and size distributions near the sparger and in the developed region of the column; in particular, the image analysis is applied to different gas velocities in the homogeneous regime in both the batch and counter-current modes. The optical probe is used to acquire radial profiles of the local properties (i.e., local void fraction and bubble rise velocity) to study the flow properties and further investigate the flow regime transition. Comparing the results from the different techniques, the influence of the gas superficial velocity and the liquid superficial velocity is discussed considering all main aspects of the two-phase flow, from the local flow properties to the global flow features. The counter-current mode is found to increase the holdup, reduce the bubble rise velocity, destabilize the homogeneous regime and change the local flow properties. © 2016 Elsevier Ltd.
机译：在本文中，我们应用了多种实验技术来研究逆流模式对气泡塔流体动力学的影响。我们研究了一个高度为5.3 m，内径为0.24 m的气泡水柱，并考虑了气体表观速度在0.004-0.20 m / s范围内以及液体表观速度在-0.09 m / s以下的情况。 s。实验研究包括滞留，气体分离，图像分析和光学探针测量。保持率测量值与文献进行了比较，并用于研究流态转换。气体分离测试用于进一步研究流态转换和研究滞留曲线的结构。图像分析用于研究喷头附近和柱子发达区域中的气泡形状和大小分布；特别地，图像分析在间歇和逆流模式下均质状态下应用于不同的气体速度。光学探针用于获取局部特性的径向轮廓（即局部空隙率和气泡上升速度），以研究流动特性并进一步研究流动状态的转变。比较不同技术的结果，讨论了气体表观速度和液体表观速度的影响，考虑了两相流的所有主要方面，从局部流动特性到整体流动特征。发现逆流模式会增加滞留率，降低气泡上升速度，破坏均匀状态并改变局部流动特性。 ©2016爱思唯尔有限公司。

著录项

  • 作者

    Besagni G.; Inzoli Fabio;

  • 作者单位
  • 年度 2016
  • 总页数
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类

相似文献

  • 外文文献
  • 中文文献
  • 专利

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