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Investigation of Sphericity Assumption for Bubbles in the Numerical Simulation of Bubbly flow in a Vertical Cylinder

Author Affiliations

  • 1 Deputy Director of Research, Institute for International Energy Studies (IIES), IRAN
  • 2 Department of Engineering, Islamic Azad University, Marivan Branch, IRAN
  • 3 Director of Research, Institute for International Energy Studies (IIES), TEHRAN, IRAN

Res. J. Recent Sci., Volume 4, Issue (1), Pages 9-16, January,2 (2015)

Abstract

To investigate the sensitivity of the numerical results to the sphericity of the bubbles, numerical simulation of bubbly flow caused by the axial gas injection into a vertical cylinder is studied. The mathematical model solves transport equations for the variables of each phase including the interphase mass and momentum exchange. Both spherical and non-spherical bubbles are investigated. Therefore, two methods are used to calculate the drag coefficient. The first is the empirical correlation obtained from the standard drag curve. This method is suitable when the bubbles remain spherical in shape and the surface-tension effects are negligible. Another approach is the "dirty water" model. This model covers the complete range of Reynolds numbers, Weber numbers, and is suitable for the various shapes of bubbles. The predicted results are in good agreement with experimental data available in the literature. It is found that the numerical results computed by the "dirty water" model are closer to those of the experimental data.

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