Transport Phenomena and Fluid Mechanics

Bubble evolution and necking at a submerged orifice for the complete range of orifice tilt

  1. Arup K. Das,
  2. Prasanta K. Das*

Article first published online: 9 MAY 2012

DOI: 10.1002/aic.13828

Issue

AIChE Journal

AIChE Journal

Volume 59, Issue 2, pages 630–642, February 2013

Additional Information

How to Cite

Das, A. K. and Das, P. K. (2013), Bubble evolution and necking at a submerged orifice for the complete range of orifice tilt. AIChE J., 59: 630–642. doi: 10.1002/aic.13828

Author Information

  1. Dept. of Mechanical Engineering, Indian Institute of Technology, Kharagpur, India

*Correspondence concerning this article should be addressed to P. K. Das at pkd@mech.iitkgp.ernet.in.

Publication History

  1. Issue published online: 23 JAN 2013
  2. Article first published online: 9 MAY 2012
  3. Accepted manuscript online: 26 APR 2012 09:54AM EST
  4. Manuscript Revised: 20 APR 2012
  5. Manuscript Received: 21 AUG 2011

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Keywords:

  • submerged orifice;
  • orifice inclination;
  • bubble;
  • frequency;
  • smoothed particle hydrodynamics

Bubble formation at an inclined orifice has been studied numerically using coupled-diffused interface-smoothed particle hydrodynamics. The simulation covers the entire range of orifice inclination, starting from upward facing (0°) to downward facing (180°) orientation for a moderate air flow (30 cm3/s). Bubble at the orifice mouth becomes asymmetric as the plate gets tilted. The asymmetry maximizes at vertical orientation but with downward facing orifices symmetry restores. The local hydrodynamic structure reveals that the internal circulation cells in bubble become stronger as the inclination increases making the growing bubble asymmetric. Interestingly, bubble volume for downward facing orifice is 4.75 times higher than the bubble released at upward facing orifice. Observations from the present simulations suggest that bubble frequency and shape can be controlled by allowing appropriate inclination in the orifice mouth. © 2012 American Institute of Chemical Engineers AIChE J, 59: 630–642, 2013

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