Conference Proceedings Paper
Onset of Stable Dryout Condition in Diabatic Annular Two-Phase Flow
NURETH-14 - 2011 September 25-30
Henryk Anglart (Royal Institute of Technology)
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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