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Simulation of Multi-Mode Film Boiling Using Level Set Method

[+] Author Affiliations
Vinesh H. Gada, Atul Sharma

Indian Institute of Technology, Bombay, Mumbai, India

Paper No. IMECE2009-11161, pp. 1611-1620; 10 pages
doi:10.1115/IMECE2009-11161
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4382-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

2D transient multi-mode film boiling simulation of water near critical pressure (p = 0.99 pc = 21.9 MPa) on a heated horizontal surface is carried out using an in-house Level Set (LS) method based semi-explicit finite volume method code. The influence of initial vapor film thickness (yo ) on the dominant instability mode is evaluated by carrying out simulations on domain having width greater than most dangerous Taylor wavelength i.e. LX = 4 λd with y0 = 0.0425 λd and 0.125 λd at low wall superheat (ΔT = 2 K). For lower initial film thickness, the viscous force dominated Rayleigh-Taylor instability is captured and the average bubble spacing is found close to the prediction made using lubrication theory i.e. λP = 2λc = 0.816 λd . However, for higher initial film thickness, the inertia force dominated Taylor-Helmholtz mode of instability is found with the average bubble spacing close to λd . Simulations are carried out to check the existence of Rayleigh-Taylor instability on various domain width LX = 2 λd , 3 λd , 4 λd and 6 λd at yo = 0.0425 λd and ΔT = 2 K. The average bubble spacing for all domain widths is found to be less than 2λc indicating that the Rayleigh-Taylor instability is dominant.

Copyright © 2009 by ASME

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