Experimental study of the falling film of liquid around a Taylor bubble

被引：41
|
作者：
de Azevedo, Marcos B. [1 ,3 ]
dos Santos, Douglas [1 ,2 ]
Faccini, Jose L. H. [1 ]
Su, Jian [3 ]
机构：
[1] Inst Engn Nucl CNEN, Nucl Engn Div, BR-21941906 Rio De Janeiro, Brazil
[2] Univ Fed Rio de Janeiro, POLI, Dept Nucl Engn, BR-21945970 Rio De Janeiro, Brazil
[3] Univ Fed Rio de Janeiro, COPPE, Nucl Engn Program, CP 68509, BR-21941972 Rio De Janeiro, Brazil
来源：
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW | 2017年 / 88卷
关键词：
Taylor bubble; Falling liquid film; Equilibrium film thickness; Film development length; Ultrasonic technique; Stagnant liquid; KINEMATIC VISCOSITY; AQUEOUS-SOLUTIONS; VELOCITY-FIELD; VERTICAL TUBES; GAS-BUBBLES; WATER; FLOW; GLYCEROL; THICKNESS; MOTION;
D O I：
10.1016/j.ijmultiphaseflow.2016.09.021
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The present work reports an experimental study of the falling liquid film around single Taylor bubbles rising in vertical tubes filled with stagnant liquids by using a pulse-echo ultrasonic technique. The experiments were carried out in acrylic tubes 2.0 m long, with inner diameters of 0.019, 0.024 and 0.034 m, with five water-glycerin mixtures, corresponding to inverse viscosity number ranging from 15 to 22422. The rising bubble and the falling liquid film were measured by using ultrasonic transducers located at the one side of the tube. The velocity and profile of the Taylor bubble, and the development length and equilibrium thickness of the falling liquid film around the bubble were obtained by the ultrasonic signals processing. Based on the experimental results of the present study, several correlations available to estimate the equilibrium thicknesses of liquid films falling around Taylor bubbles were evaluated and new correlations were proposed to estimate the dimensionless equilibrium film thickness and the film development length respectively. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：133 / 141
页数：9
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