Fluid Mechanics and Transport Phenomena

The dynamics of single air bubbles and alcohol drops in sunflower oil at various temperatures

  1. W. Duangsuwan1,*,
  2. U. Tuzun1,
  3. P.A. Sermon2

Article first published online: 16 JUN 2010

DOI: 10.1002/aic.12324

Issue

AIChE Journal

AIChE Journal

Volume 57, Issue 4, pages 897–910, April 2011

Additional Information

How to Cite

Duangsuwan, W., Tuzun, U. and Sermon, P.A. (2011), The dynamics of single air bubbles and alcohol drops in sunflower oil at various temperatures. AIChE J., 57: 897–910. doi: 10.1002/aic.12324

Author Information

  1. 1

    Dept. of Chemical and Process Engineering, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK

  2. 2

    Dept. of Chemistry, Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK

*Dept. of Chemical and Process Engineering, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, UK

Publication History

  1. Issue published online: 10 MAR 2011
  2. Article first published online: 16 JUN 2010
  3. Manuscript Revised: 4 JUN 2010
  4. Manuscript Received: 9 OCT 2009

Funded by

  • Government of the Kingdom of Thailand, under the Thai-UK Collaborative Research Network scheme

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Keywords:

  • bubble;
  • alcohol drops;
  • sunflower oil;
  • terminal velocity;
  • drag coefficient

Abstract

Steady rises of a single air bubble, a methanol drop, and an ethanol drop in a vertical glass column of refined sunflower oil at temperatures of 25, 30, 40, and 50°C are investigated experimentally using photography. The Reynolds numbers obtained are 0.07–16, 0.02–13.43, and 0.017–11.18 for the air bubbles, methanol drops, and ethanol drops, respectively. Results for terminal velocity and drag coefficient are compared with the selected existing correlations for bubble and drop motions in immiscible liquids. Correlations by Rodrigue show good agreement for various bubble sizes and system temperatures. Experimental drag coefficients of methanol and ethanol drops show a systematic deviation from the Oliver and Chung and the Darton and Harrison correlations, respectively. Considering the effect of dissolution of alcohol in vegetable oil, which varies with temperature, on the drop dynamics, semiempirical correction factors are applied to the last two correlations to fit the experimental results. © 2010 American Institute of Chemical Engineers AIChE J, 2011

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