Bubble coalescence efficiency near multi-orifice plate

作     者：Jiming Wen Qiunan Sun Zhongning Sun Haifeng Gu 

作者机构：Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2019年第27卷第8期

页      面：1765-1776页

核心收录：

学科分类：0817[工学-化学工程与技术] 08[工学] 

基　　金：Supported by the Fundamental Research Funds for the Central Universities(HEUCFP201855) 

主　　题：Bubble column Bubble coalescence efficiency Multi-orifice plate Coalescence time 

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.