Two-Phase Flow and Bubble Size Distribution in Air-Sparged and Surface-Aerated Vessels Stirred by a Dual Impeller

2010 ◽  
Vol 49 (6) ◽  
pp. 2613-2623 ◽  
Author(s):  
Giuseppina Montante ◽  
Fabio Laurenzi ◽  
Alessandro Paglianti ◽  
Franco Magelli
Keyword(s):  
Size Distribution ◽  
Bubble Size ◽  
Two Phase Flow ◽  
Bubble Size Distribution ◽  
Phase Flow ◽  
Two Phase

An Optical Method for Determining Bubble Size Distributions—Part I:Theory

1988 ◽  
Vol 110 (3) ◽  
pp. 325-331 ◽  
Author(s):  
P. R. Meernik ◽  
M. C. Yuen
Keyword(s):  
Statistical Analysis ◽  
Size Distribution ◽  
Bubble Size ◽  
Bubbly Flow ◽  
Bubble Size Distribution ◽  
Phase Flow ◽  
Size Distributions ◽  
Optical Technique ◽  
Narrow Beam ◽  
Two Phase

A new optical technique is developed to determine the size distribution of bubbles in a two-phase flow. Implementation involves passing a narrow beam of light through the bubbly flow and monitoring the transmitted light intensity. The basic units of data are the rate at which each bubble blocks off the beam and the duration of blockage. Adding the hypothesis that the distance of closest approach between a bubble’s center and the beam axis is randomly distributed, a statistical analysis yields the bubble size distribution.

scholarly journals CFD Simulation of Polydispersed Bubbly Two-Phase Flow around an Obstacle

2009 ◽  
Vol 2009 ◽  
pp. 1-12 ◽  
Author(s):  
E. Krepper ◽  
P. Ruyer ◽  
M. Beyer ◽  
D. Lucas ◽  
H.-M. Prasser ◽  
...  
Keyword(s):  
Size Distribution ◽  
Cfd Simulation ◽  
Two Phase Flow ◽  
Fluid Model ◽  
Size Distribution Function ◽  
Phase Flow ◽  
Two Phase ◽  
Ansys Cfx ◽  
Two Fluid Model ◽  
Drag And Lift

This paper concerns the model of a polydispersed bubble population in the frame of an ensemble averaged two-phase flow formulation. The ability of the moment density approach to represent bubble population size distribution within a multi-dimensional CFD code based on the two-fluid model is studied. Two different methods describing the polydispersion are presented: (i) a moment density method, developed at IRSN, to model the bubble size distribution function and (ii) a population balance method considering several different velocity fields of the gaseous phase. The first method is implemented in the Neptune_CFD code, whereas the second method is implemented in the CFD code ANSYS/CFX. Both methods consider coalescence and breakup phenomena and momentum interphase transfers related to drag and lift forces. Air-water bubbly flows in a vertical pipe with obstacle of the TOPFLOW experiments series performed at FZD are then used as simulations test cases. The numerical results, obtained with Neptune_CFD and with ANSYS/CFX, allow attesting the validity of the approaches. Perspectives concerning the improvement of the models, their validation, as well as the extension of their applicability range are discussed.

Predictive control of the bubble size distribution in a two-phase pilot flotation column

2016 ◽  
Vol 89 ◽  
pp. 71-76 ◽  
Author(s):  
A. Riquelme ◽  
A. Desbiens ◽  
R. del Villar ◽  
M. Maldonado
Keyword(s):  
Size Distribution ◽  
Predictive Control ◽  
Bubble Size ◽  
Bubble Size Distribution ◽  
Two Phase ◽  
Flotation Column

scholarly journals The Effect of Bubble Size on the Radial Distribution of Void Fraction in Two-Phase Flow in a Circular Tube

2001 ◽  
Vol 38 (9) ◽  
pp. 711-720 ◽  
Author(s):  
Hideki HORIE ◽  
Noriyuki SHIRAKAWA ◽  
Yoshiharu TOBITA ◽  
Koji MORITA ◽  
Satoru KONDO
Keyword(s):  
Void Fraction ◽  
Radial Distribution ◽  
Bubble Size ◽  
Two Phase Flow ◽  
Circular Tube ◽  
Phase Flow ◽  
Two Phase

scholarly journals Three-Dimensional Gas-Phasic Velocity Measurement of Two-Phase Flow in Terms of Bubble Size in a Large-Diameter Pipe

2012 ◽  
Vol 25 (5) ◽  
pp. 443-450
Author(s):  
Taizo KANAI ◽  
Masahiro FURUYA ◽  
Takahiro ARAI ◽  
Kenetsu SHIRAKAWA ◽  
Yoshihisa NISHI
Keyword(s):  
Bubble Size ◽  
Velocity Measurement ◽  
Two Phase Flow ◽  
Large Diameter ◽  
Three Dimensional ◽  
Phase Flow ◽  
Two Phase ◽  
Large Diameter Pipe ◽  
Diameter Pipe
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