A visualized study of interfacial behavior of air–water two-phase flow in a rectangular Venturi channel  

作　　者：Jiang Huang Licheng Sun Min Du Zhengyu Mo Liang Zhao 

机构地区：[1]State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource & Hydropower,Sichuan University

出　　处：《Theoretical & Applied Mechanics Letters》2018年第5期334-344,363,共12页力学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grants 51709191, 51606130, and 51506099)

摘　　要：A visualized investigation was carried out on the effect of the diverging angle on the bubble motion and interfacial behavior in a Venturi-type bubble generator.It was found two or three large vortexes formed in the diverging section,resulting in strong reentrant jet flow in the front of the bubbles or slugs rushing out of the throat.The jet flow in return bumps into the ongoing bubbles or slugs,leading to strong interaction between the gas and liquid phases.The diverging angle has significant influence on the reentrant flow process and the performance of the bubble generator as well.Increasing the diverging angle results in the reentrant flow moving further forward to the upstream and intensifies the interaction between the two phases.As a consequence,the breakup or collapse of bubbles becomes more violent,whereby finer bubbles are generated.As such,the reentrant flow strongly links to the performance of the Venturi channel taken as a bubble generator,and that a moderate increase in the diverging angle can improve its performance without additional increase in flow resistance like that by increasing liquid flow rate.A visualized investigation was carried out on the effect of the diverging angle on the bubble motion and interfacial behavior in a Venturi-type bubble generator.It was found two or three large vortexes formed in the diverging section,resulting in strong reentrant jet flow in the front of the bubbles or slugs rushing out of the throat.The jet flow in return bumps into the ongoing bubbles or slugs,leading to strong interaction between the gas and liquid phases.The diverging angle has significant influence on the reentrant flow process and the performance of the bubble generator as well.Increasing the diverging angle results in the reentrant flow moving further forward to the upstream and intensifies the interaction between the two phases.As a consequence,the breakup or collapse of bubbles becomes more violent,whereby finer bubbles are generated.As such,the reentrant flow strongly links to the performance of the Venturi channel taken as a bubble generator,and that a moderate increase in the diverging angle can improve its performance without additional increase in flow resistance like that by increasing liquid flow rate.

关 键 词：VENTURI CHANNEL REENTRANT jet flow process INTERFACIAL behavior BUBBLE BREAKUP Diverging angle 

分 类 号：O3[理学—力学]