Study on the Flow Field around Two Parallel Moving Bubbles and Interaction Between Bubbles Rising in CMC Solutions by PIV

›› 2009, Vol. 17 ›› Issue (6): 904-913.

• FLUID FLOW AND TRANSPORT PHENOMENA • Previous Articles Next Articles

Study on the Flow Field around Two Parallel Moving Bubbles and Interaction Between Bubbles Rising in CMC Solutions by PIV

FAN Wenyuan¹, MA Youguang¹, LI Xiaolei¹, LI Huaizhi²

1. State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technoloy, Tianjin University, Tianjin 300072, China;
2. L aboratoire des Sciences du G閚ie Chimique, CNRS-ENSIC-INPL, 1 rue Grandville, BP 451, 54001 Nancy Cedex, France

Received:2009-02-11 Revised:2009-10-12 Online:2009-12-28 Published:2009-12-28
Supported by:
Supported by the National Natural Science Foundation of China (20476073);the State Key Laboratory of Chemical Engineering (SKL-ChE-08B03);the Programs of Introducing Talents of Discipline to Universities (B06006)

Study on the Flow Field around Two Parallel Moving Bubbles and Interaction Between Bubbles Rising in CMC Solutions by PIV

范文元¹, 马友光¹, 李小磊¹, 李怀志²

1. State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technoloy, Tianjin University, Tianjin 300072, China;
2. Laboratoire des Sciences du G閚ie Chimique, CNRS-ENSIC-INPL, 1 rue Grandville, BP 451, 54001 Nancy Cedex, France

通讯作者: MA Youguang,E-mail:ygma@tju.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China (20476073);the State Key Laboratory of Chemical Engineering (SKL-ChE-08B03);the Programs of Introducing Talents of Discipline to Universities (B06006)

Abstract

Abstract: The flow fields surrounding two parallel moving bubbles rising from two identical orifices submerged in non-Newtonian fluid of carboxymethylcellulose(CMC) solution of three different mass concentration were measured experimentally by the use of particle image velocimetry(PIV).The influences of gas flowrate,solution mass concentration,orifice interval and the angle between two bubble centers line and vertical direction on the flow field surrounding bubbles were discussed respectively by analyzing the velocity vector,velocity contours as well as individual velocity components.The results show that the liquid velocity both in front of two bubbles and behind increases with gas flowrate duo to shear-thinning effect of previous bubbles,whereas decreases with the increase of CMC concentration due to the increase of drag force acting on bubbles.The effect of the orifice interval on the flow field around two moving bubbles becomes gradually obvious as the interval becomes closer.Moreover,two adjacent side-by-side bubbles repulse each other during rising,leading to the practical interval between them increased somewhat above the orifice interval.When the distance between bubbles is less than the orifice interval l0 mm,the interaction between two neighboring bubbles changed from mutual repellence to attraction with the decrease of the angle of the line of linking two bubble centers to the vertical direction.

Key words: parallel bubbles, particle image velocimetry, non-Newtonian fluid, flow field distribution

摘要： The flow fields surrounding two parallel moving bubbles rising from two identical orifices submerged in non-Newtonian fluid of carboxymethylcellulose(CMC) solution of three different mass concentration were measured experimentally by the use of particle image velocimetry(PIV).The influences of gas flowrate,solution mass concentration,orifice interval and the angle between two bubble centers line and vertical direction on the flow field surrounding bubbles were discussed respectively by analyzing the velocity vector,velocity contours as well as individual velocity components.The results show that the liquid velocity both in front of two bubbles and behind increases with gas flowrate duo to shear-thinning effect of previous bubbles,whereas decreases with the increase of CMC concentration due to the increase of drag force acting on bubbles.The effect of the orifice interval on the flow field around two moving bubbles becomes gradually obvious as the interval becomes closer.Moreover,two adjacent side-by-side bubbles repulse each other during rising,leading to the practical interval between them increased somewhat above the orifice interval.When the distance between bubbles is less than the orifice interval l0 mm,the interaction between two neighboring bubbles changed from mutual repellence to attraction with the decrease of the angle of the line of linking two bubble centers to the vertical direction.

关键词: parallel bubbles, particle image velocimetry, non-Newtonian fluid, flow field distribution

FAN Wenyuan, MA Youguang, LI Xiaolei, LI Huaizhi. Study on the Flow Field around Two Parallel Moving Bubbles and Interaction Between Bubbles Rising in CMC Solutions by PIV[J]. , 2009, 17(6): 904-913.

范文元, 马友光, 李小磊, 李怀志. Study on the Flow Field around Two Parallel Moving Bubbles and Interaction Between Bubbles Rising in CMC Solutions by PIV[J]. , 2009, 17(6): 904-913.

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Study on the Flow Field around Two Parallel Moving Bubbles and Interaction Between Bubbles Rising in CMC Solutions by PIV

Study on the Flow Field around Two Parallel Moving Bubbles and Interaction Between Bubbles Rising in CMC Solutions by PIV

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