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Numerical Study on Effect of Pressure on Behavior of Bubble Coalescence by Using CMFD Simulation

[+] Author Affiliations
Ayako Ono, Takayuki Suzuki, Hiroyuki Yoshida

Japan Atomic Energy Agency, Tokai, Japan

Paper No. ICONE26-82564, pp. V06BT08A066; 6 pages
doi:10.1115/ICONE26-82564
From:
  • 2018 26th International Conference on Nuclear Engineering
  • Volume 6B: Thermal-Hydraulics and Safety Analyses
  • London, England, July 22–26, 2018
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-5149-4
  • Copyright © 2018 by ASME

abstract

The mechanism of critical heat flux (CHF) for higher system pressure remains to be clarified, even though it is important to evaluate the CHF for the light water reactor (LWR) which is operated under the high pressure condition. In this study, the process of bubble coalescence was simulated by using a computational multi-fluid dynamics (CMFD) simulation code TPFIT under various system pressure in order to investigate the behavior of bubbles as a basic study. The growth of bubbles was simulated by blowing of vapor from a tiny orifice simulating bubble bottom. One or four orifices were located on the bottom surface in this simulation study. The numerical simulations were conducted by varying the pressure and temperature.

Copyright © 2018 by ASME

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