This work concerns an experimental and computational investigation of the turbulent two-phase flow and bubble size distribution in a gas-liquid stirred vessel of standard geometry. The experiments were carried out using a two-phase Particle Image Velocimetry technique and a digital image processing method based on a threshold criterion. With the former technique, the liquid and the gas phase ensemble-averaged mean and r.m.s. velocities were measured simultaneously, while with the latter the dimensions of the bubbles dispersed inside the liquid were evaluated. On the modelling side, a Computational Fluid Dynamic approach was adopted, that was based on the solution of Reynolds Average Navier-Stokes equations in an Eulerian framework for both phases. As for the bubble dimensions modelling, the mono-disperse assumption as well as the Multiple Size Group Model, including a population balance with break-up and coalescence models, were considered. The bubble size distribution and the axial and radial velocity of the gas and the liquid phase measured on a vertical plane mid-way between two baffles are presented and discussed. The outcomes of the computational work are evaluated on the basis of the experimental findings

Bubble size distribution and turbulent two-phase flow in aerated stirred vessels

MONTANTE, GIUSEPPINA MARIA ROSA;PAGLIANTI, ALESSANDRO;MAGELLI, FRANCO
2007

Abstract

This work concerns an experimental and computational investigation of the turbulent two-phase flow and bubble size distribution in a gas-liquid stirred vessel of standard geometry. The experiments were carried out using a two-phase Particle Image Velocimetry technique and a digital image processing method based on a threshold criterion. With the former technique, the liquid and the gas phase ensemble-averaged mean and r.m.s. velocities were measured simultaneously, while with the latter the dimensions of the bubbles dispersed inside the liquid were evaluated. On the modelling side, a Computational Fluid Dynamic approach was adopted, that was based on the solution of Reynolds Average Navier-Stokes equations in an Eulerian framework for both phases. As for the bubble dimensions modelling, the mono-disperse assumption as well as the Multiple Size Group Model, including a population balance with break-up and coalescence models, were considered. The bubble size distribution and the axial and radial velocity of the gas and the liquid phase measured on a vertical plane mid-way between two baffles are presented and discussed. The outcomes of the computational work are evaluated on the basis of the experimental findings
Proceedings of ICMF 2007 6th International Conference on Multiphase Flow
S6_Tue_A_15_1
S6_Tue_A_15_10
D. HORN; G. MONTANTE; A. PAGLIANTI; F. MAGELLI
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/52872
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