Multiscale modelling of mass transfer in gas jets and bubble plumes

2019 ◽  
Vol 97 (11) ◽  
pp. 2843-2869 ◽  
Author(s):  
Devin J. O'Malley ◽  
Jan B. Haelssig
Keyword(s):  
Mass Transfer ◽  
Multiscale Modelling ◽  
Gas Jets ◽  
Bubble Plumes

Numerical modeling of large-scale bubble plumes accounting for mass transfer effects

2002 ◽  
Vol 28 (11) ◽  
pp. 1763-1785 ◽  
Author(s):  
Gustavo C. Buscaglia ◽  
Fabián A. Bombardelli ◽  
Marcelo H. Garcı́a
Keyword(s):  
Mass Transfer ◽  
Numerical Modeling ◽  
Large Scale ◽  
Transfer Effects ◽  
Bubble Plumes

A numerical analysis of the effect of bubble-induced liquid flow on mass transfer in bubble plumes

2010 ◽  
Author(s):  
X. B. Gong ◽  
Shu Takagi ◽  
Yoichiro Matsumoto ◽  
Liejin Guo ◽  
D. D. Joseph ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Numerical Analysis ◽  
Liquid Flow ◽  
Bubble Plumes

Momentum and Mass Transfer in Coaxial Gas Jets

1950 ◽  
Vol 17 (4) ◽  
pp. 399-408 ◽  
Author(s):  
Walton Forstall ◽  
Ascher H. Shapiro
Keyword(s):  
Mass Transfer ◽  
Momentum Transfer ◽  
Integral Method ◽  
Constant Pressure ◽  
Velocity Ratio ◽  
Moving Medium ◽  
Density Data ◽  
Gas Jets ◽  
Schmidt Numbers ◽  
Independent Variable

Abstract The mixing at constant pressure of a circular jet with an annular coaxial stream has been studied for conditions of nearly common density and temperature, but differing initial velocities. By using 10 per cent by volume of helium as a tracer in the inner stream, the mixing region was mapped with respect to both material and momentum transfer. It is concluded that material diffuses more rapidly than momentum; that the principal independent variable determining the shape of the mixing region is the velocity ratio of the streams; and that the integral method of Squire and Trouncer, using experimentally determined constants, is adequate for predicting approximate values of concentration and velocity in the mixing region of a jet flowing into a moving medium of the same density. Data for widely different experiments of various investigators show that the turbulent Prandtl and the Schmidt numbers are both within ±10 per cent of 0.70, independent of the nature of the experiment and the magnitudes of the laminar Prandtl and Schmidt numbers.

Development of Microbubble Generator and its Utilization to Enhance the Mass Transfer in the Bubble Plumes and Columns

2012 ◽  
Author(s):  
Akiko Kaneko ◽  
Xiaobo Gong ◽  
Shu Takagi ◽  
Yoichiro Matsumoto
Keyword(s):  
Mass Transfer ◽  
Liquid Velocity ◽  
Bubble Diameter ◽  
Mass Transfer Rate ◽  
Venturi Tube ◽  
Transfer Efficiency ◽  
Initial Water ◽  
Plume Structure ◽  
Mass Transfer Efficiency ◽  
Bubble Plumes

Microbubble has characteristics of large surface area to unit volume and small buoyancy. We propose an effective technique to generate tiny bubbles less than 200 μm diameter utilizing a venturi tube at high void fraction. The mechanism of bubble breakup in the venturi tube is elucidated that the bubbles expanded after passing through the throat and then shrank rapidly. The tiny bubbles are generated due to the surface instability of shrinking bubbles. The effect of bubble diameter and plume structure on mass transfer efficiency in bubble plumes and columns are investigated numerically. In order to capture the detailed plume structure, the interaction between liquid and bubbles is treated by a two-way coupling Eulerian–Lagrangian method. The gas transfer from bubbles to liquid is computed by modeling the mass transfer rate of individual bubbles. The numerical results show that the dissolution efficiency changes rapidly when the initial bubble size reaches certain value. The effect of bubble-induced liquid velocity on the residence time of microbubbles increases with the decrease of initial bubble diameters, and also increases with the reduction of initial water depth. By comparing the concentrated and uniform bubble injections, the results suggest that the uniform injection provides much better mass transfer efficiency becasue the circulation of liquid induced by bubble is greatly suppressed.

A numerical study of mass transfer of ozone dissolution in bubble plumes with an Euler–Lagrange method

2007 ◽  
Vol 62 (4) ◽  
pp. 1081-1093 ◽  
Author(s):  
Xiaobo Gong ◽  
Shu Takagi ◽  
Huaxiong Huang ◽  
Yoichiro Matsumoto
Keyword(s):  
Mass Transfer ◽  
Numerical Study ◽  
Lagrange Method ◽  
Bubble Plumes

scholarly journals Influence of mass transfer on bubble plume hydrodynamics

2016 ◽  
Vol 88 (1) ◽  
pp. 411-422 ◽  
Author(s):  
IRAN E. LIMA NETO ◽  
PRISCILA A.B. PARENTE
Keyword(s):  
Mass Transfer ◽  
Gas Flow ◽  
Low Flow ◽  
Integral Model ◽  
Bubble Plume ◽  
Flow Rates ◽  
Functional Relationships ◽  
Bubble Plumes ◽  
The Impact ◽  
Water Depths

ABSTRACT This paper presents an integral model to evaluate the impact of gas transfer on the hydrodynamics of bubble plumes. The model is based on the Gaussian type self-similarity and functional relationships for the entrainment coefficient and factor of momentum amplification due to turbulence. The impact of mass transfer on bubble plume hydrodynamics is investigated considering different bubble sizes, gas flow rates and water depths. The results revealed a relevant impact when fine bubbles are considered, even for moderate water depths. Additionally, model simulations indicate that for weak bubble plumes (i.e., with relatively low flow rates and large depths and slip velocities), both dissolution and turbulence can affect plume hydrodynamics, which demonstrates the importance of taking the momentum amplification factor relationship into account. For deeper water conditions, simulations of bubble dissolution/decompression using the present model and classical models available in the literature resulted in a very good agreement for both aeration and oxygenation processes. Sensitivity analysis showed that the water depth, followed by the bubble size and the flow rate are the most important parameters that affect plume hydrodynamics. Lastly, dimensionless correlations are proposed to assess the impact of mass transfer on plume hydrodynamics, including both the aeration and oxygenation modes.

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