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International Journal of Fluid Mechanics Research
ESCI SJR: 0.22 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimer: 2152-5102
ISSN En ligne: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v43.i2.30
pages 119-140

Momentum and Mass Transfer Phenomena of Contaminated Bubble Swarms in Power-Law Liquids

Nanda Kishore
Department of Chemical Engineering, Indian Institute of Technology Guwahati Assam781039, India
Venkata Swamy Nalajala
Department of Chemical Engineering, Indian Institute of Technology Guwahati Assam781039, India

RÉSUMÉ

Computational fluid dynamics based approach is used to investigate the momentum and mass transfer behaviors of swarms of contaminated bubbles in surfactant-laden power-law liquids using a segregated approach. Effects of surface contamination and bubble holdup are incorporated in the solver through spherical stagnant cap model and free surface cell model, respectively. Extensive new results are obtained on streamline and vorticity patterns, drag coefficients, concentration contours and local and surface averaged Sherwood numbers of contaminated bubbles in the range of conditions as: Reynolds number, Re = 1 to 200; Schmidt number, Sc = 1 to 100; bubble holdup, Φ = 0.1 to 0.5; stagnant cap angle, α = 0 to 180° and power-law behavior index, n = 0.6 to 1. Some of the key findings indicate that the drag coefficients decrease with the decreasing power-law index and/or with the decreasing cap angle and/or with the decreasing bubble holdup and/or with the increasing Reynolds number. The concentration boundary layer become thinner with the decreasing cap angle and/or with the decreasing power-law index regardless the values of the Reynolds and/or Schmidt numbers. The rate of mass transfer is found to increase with the decreasing cap angle and/or with the decreasing power-law index and/or with the increasing bubble holdup and/or with the increasing Reynolds and Schmidt numbers.


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