SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (8): 1765-1776.DOI: 10.1016/j.cjche.2018.11.006

• Fluid Dynamics and Transport Phenomena • 上一篇    下一篇

Bubble coalescence efficiency near multi-orifice plate

Jiming Wen, Qiunan Sun, Zhongning Sun, Haifeng Gu   

  1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, China
  • 收稿日期:2018-08-07 修回日期:2018-10-02 出版日期:2019-08-28 发布日期:2019-11-16
  • 通讯作者: Haifeng Gu
  • 基金资助:
    Supported by the Fundamental Research Funds for the Central Universities (HEUCFP201855).

Bubble coalescence efficiency near multi-orifice plate

Jiming Wen, Qiunan Sun, Zhongning Sun, Haifeng Gu   

  1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin 150001, China
  • Received:2018-08-07 Revised:2018-10-02 Online:2019-08-28 Published:2019-11-16
  • Contact: Haifeng Gu
  • Supported by:
    Supported by the Fundamental Research Funds for the Central Universities (HEUCFP201855).

摘要: Bubble coalescence reduces specific area and weakens the work performance of bubble column. The bubble coalescence near gas sparger which is caused mainly by bubble growing is different from the ones occurring in major liquid. Bubble coalescence efficiency near gas sparger is influenced by many factors including sparger configuration, gas flow rate, bubble deformation, solution composition, etc. This work has conducted a set of visual experiments to study the coalescence characteristics near multi-orifice plate. The experiment parameters cover a wide range of conditions including large scope of gas flow rate, different kinds of solution and orifice configurations. The experimental results suggest that coalescence time is applicable to reflect the influence of the pitch of orifices and gas flow rate on bubble coalescence efficiency. As the number of orifices increases, bubble coalescence efficiency is reduced by the disturbance from the bubbles at adjacent orifices. A hindering coefficient is used to consider the hindering effect of additives on bubble coalescence efficiency. Finally a new calculation expression is established to predict bubble coalescence efficiency near multi-orifice plate whose fundamental form is based on the logistic curve of binary response. The calculated values that refer to this calculation expression are well consistent with the experimental results.

关键词: Bubble column, Bubble coalescence efficiency, Multi-orifice plate, Coalescence time

Abstract: Bubble coalescence reduces specific area and weakens the work performance of bubble column. The bubble coalescence near gas sparger which is caused mainly by bubble growing is different from the ones occurring in major liquid. Bubble coalescence efficiency near gas sparger is influenced by many factors including sparger configuration, gas flow rate, bubble deformation, solution composition, etc. This work has conducted a set of visual experiments to study the coalescence characteristics near multi-orifice plate. The experiment parameters cover a wide range of conditions including large scope of gas flow rate, different kinds of solution and orifice configurations. The experimental results suggest that coalescence time is applicable to reflect the influence of the pitch of orifices and gas flow rate on bubble coalescence efficiency. As the number of orifices increases, bubble coalescence efficiency is reduced by the disturbance from the bubbles at adjacent orifices. A hindering coefficient is used to consider the hindering effect of additives on bubble coalescence efficiency. Finally a new calculation expression is established to predict bubble coalescence efficiency near multi-orifice plate whose fundamental form is based on the logistic curve of binary response. The calculated values that refer to this calculation expression are well consistent with the experimental results.

Key words: Bubble column, Bubble coalescence efficiency, Multi-orifice plate, Coalescence time