Inside of an effervescent atomizer gas is injected into a liquid cross-flow in order to produce a bubbly two-phase mixture. The presence of gas bubbles leads to enhanced liquid break-up as compared to simple pressure atomization of the liquid phase alone [1]. In the present work, the dynamic shapes and sizes of single air bubbles injected in liquid water cross flow of an effervescent atomizer’s mixing chamber are investigated numerically and experimentally. Particular focus is aimed on the convergent channel section just prior to the atomizer exit orifice where the bubble experiences a significant drop in pressure. Volume of fluid (VOF) modeling and simulations are performed using the commercial computational fluid dynamics (CFD) code ANSYS FLUENT and further provide information on the liquid velocities near the air bubble. A high-speed imaging system and digital image processing are used for capturing experimental data on this highly dynamic process. The numerical results are compared with experimental visualizations to better understand the physical interactions between the two phases approaching the atomizer exit.
ASME/JSME/KSME 2015 Joint Fluids Engineering Conference
July 26–31, 2015
Seoul, South Korea
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5721-2
PROCEEDINGS PAPER
A Combined Numerical and Experimental Study of Air Bubble Dynamics in Converging Section of Effervescent Atomizer
Deify Law
,
Deify Law
California State University, Fresno, CA
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Thomas Shepard
,
Thomas Shepard
University of St. Thomas, St. Paul, MN
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Ibrahim Wardi
Ibrahim Wardi
University of St. Thomas, St. Paul, MN
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Author Information
Deify Law
California State University, Fresno, CA
Thomas Shepard
University of St. Thomas, St. Paul, MN
Ibrahim Wardi
University of St. Thomas, St. Paul, MN
Paper No:
AJKFluids2015-21100, V001T21A002; 7 pages
Published Online:
November 20, 2015
Citation
Law, Deify, Shepard, Thomas, and Wardi, Ibrahim. "A Combined Numerical and Experimental Study of Air Bubble Dynamics in Converging Section of Effervescent Atomizer." Proceedings of the ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. Volume 1: Symposia. Seoul, South Korea. July 26–31, 2015. V001T21A002. ASME. https://doi.org/10.1115/AJKFluids2015-21100
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