Onset of Stable Dryout Condition in Diabatic Annular Two-Phase Flow
NURETH-14 - 2011 September 25-30


Presented at:
NURETH-14
2011 September 25-30
Location:
Toronto, Canada
Session Title:
A1-3 Boiling and Condensation Fundamentals

Authors:
Henryk Anglart (Royal Institute of Technology)
  

Abstract

Conditions for the formation of a stable dry patch in vertical diabatic annular two-phase flows are

investigated. An analytical model of the force balance for the leading edge of the liquid film is

developed. In addition to surface tension, evaporation thrust and capillary forces, the model includes

the effect of turbulence, the pressure gradient and the interfacial shear stress. Numerical evaluations

are performed to validate the model and to indicate the importance of various factors on the dry

patch stability and on the resulting minimum wetting rate of the liquid film. The analyses indicate

that good agreement with measurements is obtained in case of stagnant patch formed on liquid film

flowing down a vertical surface.

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