In this work, we present computational fluid dynamics (CFD) simulations of helium bubble formation and detachment at a submerged needle in stagnant and co-flowing mercury. Since mercury is opaque, visualization of internal gas bubbles was done with proton radiography (pRad) at the Los Alamos Neutron Science Center (LANSCE2). The acoustic waves emitted at the time of detachment and during subsequent oscillations of the bubble were recorded with a microphone. The Volume of Fluid (VOF) model was used to simulate the unsteady two-phase flow of gas injection in mercury. The VOF model is validated by comparing detailed bubble sizes and shapes at various stages of the bubble growth and detachment, with the experimental measurements at 1.66 mg/min helium gas flow rate and different mercury velocities. The experimental and computational results show a two-stage bubble formation in stagnant mercury. The first stage involves growing bubble around the needle, and the second follows as the buoyancy overcomes wall adhesion. The comparison of predicted and measured bubble sizes and shapes at various stages of the bubble growth and detachment is in good agreement.
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ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences
August 10–14, 2008
Jacksonville, Florida, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-4840-1
PROCEEDINGS PAPER
Numerical Simulation of Bubble Formation in Co-Flowing Mercury Available to Purchase
Ashraf Ibrahim,
Ashraf Ibrahim
Oak Ridge National Laboratory; Oak Ridge Associated Universities, Oak Ridge, TN
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Mark Wendel,
Mark Wendel
Oak Ridge National Laboratory, Oak Ridge, TN
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David Felde,
David Felde
Oak Ridge National Laboratory, Oak Ridge, TN
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Bernard Riemer
Bernard Riemer
Oak Ridge National Laboratory, Oak Ridge, TN
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Ashraf Ibrahim
Oak Ridge National Laboratory; Oak Ridge Associated Universities, Oak Ridge, TN
Mark Wendel
Oak Ridge National Laboratory, Oak Ridge, TN
David Felde
Oak Ridge National Laboratory, Oak Ridge, TN
Bernard Riemer
Oak Ridge National Laboratory, Oak Ridge, TN
Paper No:
FEDSM2008-55083, pp. 43-49; 7 pages
Published Online:
June 30, 2009
Citation
Ibrahim, A, Wendel, M, Felde, D, & Riemer, B. "Numerical Simulation of Bubble Formation in Co-Flowing Mercury." Proceedings of the ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. Volume 1: Symposia, Parts A and B. Jacksonville, Florida, USA. August 10–14, 2008. pp. 43-49. ASME. https://doi.org/10.1115/FEDSM2008-55083
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