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Numerical Simulation of Subcooled Flow Boiling Using a Bubble Tracking Method

[+] Author Affiliations
Tomio Okawa, Naoki Miyano, Kazuhiro Kaiho, Koji Enoki

University of Electro-Communications, Chofu-shi, Japan

Paper No. ICONE24-60088, pp. V003T09A004; 6 pages
doi:10.1115/ICONE24-60088
From:
  • 2016 24th International Conference on Nuclear Engineering
  • Volume 3: Thermal-Hydraulics
  • Charlotte, North Carolina, USA, June 26–30, 2016
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-5003-9
  • Copyright © 2016 by ASME

abstract

The process of bubble nucleation in subcooled flow boiling was visualized using a high speed camera to show that the bubble size can be significantly different between the nucleation sites. However, the bubble size is usually assumed constant in the numerical simulation of subcooled flow boiling. To explore the effect of the bubble size distribution on the void fraction in subcooled flow boiling, numerical simulations were performed using a bubble tracking method in which the size and position of each bubble are calculated individually using a Lagrangian coordinates. In the present simulation, the void fraction was greater when the bubble size distribution was taken into consideration. Since the bubble tracking method requires many correlations, further improvement is necessary. The present numerical results however indicate that the bubble size distribution should be taken in to consideration to evaluate the void fraction in subcooled flow boiling accurately.

Copyright © 2016 by ASME

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