Springer LINK: The European Physical Journal B - Abstract Volume 4 Issue 3 (1998) pp 369-377

The European Physical Journal B

ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)

Table of Contents

Abstract Volume 4 Issue 3 (1998) pp 369-377

I. Formation and rise of a bubble stream in a viscous liquid

P. Snabre (a), F. Magnifotcham

Institut de Science et de génie des matériaux et procédés (UPR 8521), BP5, 66125 Font-Romeu, France

Received: 23 July 1997 / Revised: 16 December 1997 / Accepted: 11 May 1998

Abstract: The continuous emission of gas bubbles from a single ejection orifice immersed in a viscous fluid is considered. We first present a semi empirical model of spherical bubble growth under constant flow conditions to predict the bubble volume at the detachment stage. In a second part, we propose a physical model to describe the rise velocity of in-line interacting bubbles and we derive an expression for the net viscous force acting on the surrounding fluid. Experimental results for air/water-glycerol systems are presented for a wide range of fluid viscosity $\rm (43 mPa s - 800 \; mPa s)$ and compared with theoretical predictions. An imagery technique was used to determine the bubble size and rise velocity. The effects of fluid viscosity, gas flow rate, orifice diameter and liquid depth on the bubble stream dynamic were analyzed. We have further studied the effect of large scale recirculation flow and the influence of a neighbouring bubble stream on the bubble growth and rising velocity.

PACS. 47.55-t Nonhomogeneous flows - 47.55.Dz Drops and bubbles - 47.10.+g General theory

(a) email: snabre@imp-odeillo.fr

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