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Experimental and numerical study of the interaction of a bubble with an inclined wall

Barbosa, Christophe. Experimental and numerical study of the interaction of a bubble with an inclined wall. PhD, Energétique et Transferts, Institut National Polytechnique de Toulouse, 2016

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Abstract

The objective of the thesis is to study the interaction of a high Reynolds moderate Weber numberbubble with an inclined wall. For a given bubble-liquid combination, an increase of the inclinationangle results in a transition from a steady sliding motion to periodic bounces. An experimentaldevice was designed and built to generate the collision of bubbles in terminal state conditions withan inclined wall, with inclination angles ranging from 5 to 80. Experiments were conductedconsidering different liquid and bubble diameters. The bubble shape and position was recordedusing a high speed camera whereas the wake behavior was captured using a time resolved Particle Image Velocimetry technique. In addition, the interaction process was also studied using anumerical code. Considering a force balance on the sliding bubble, that takes into account theviscous or inertial nature of the drag force, the sliding and bouncing motions were wellcharacterized and validated by the experimental results. The inertial sliding and bouncing motionswere associated to a constant tangential Froude number. As for the viscous sliding motion, the corresponding drag coefficient was satisfactorily modelled through the additive effects of thepotential-flow wall effect and the vorticity production at the wall. Through the same force balance projected along the normal axis, a set of relations were obtained for the transition from sliding tobouncing motions. The wake induced lift force results to be of major importance for the transitioncriteria. The different phases that characterize the oblique collision were analyzed. Accordingly,the initial and final times for the process were chosen. On this basis, models for the normal and tangential coefficient of restitutions were proposed and numerically supported. The numericalsimulations reproduced the different aspect of the bubble inclined wall interaction.

Item Type:PhD Thesis
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Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
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Research Director:
Legendre, Dominique and Zenit camacho, Jose roberto
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Deposited On:05 Mar 2020 14:56

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