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Dryout in annular flow - theoretical analysis

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Mikielewicz D. , Wajs J. , Gliński M. , Zrooga A.

Archives of Thermodynamics

2009

tom Vol. 30, no. 2

77-90

In the paper a two-equation model of mass balance of liquid in the film and in the core for calculation of dryout at high vapour quality is modified from the earlier version presented by Sedler and Mikielewicz [1]. Additionally, the mass balance equation for the liquid film contains a modified evaporation term. Modified is the heat flux density applied in evaporation of liquid film which now is variable within film thickness. The solution of such equations requires prior knowledge of rates of deposition and entrainment. The theoretical determination of there quantities involves serious difficulties. The relations for determination of deposition and entrainment rate are taken therefore from Okawa et al. [3], The results of calculations are validated against experimental data of Sedler and Mikielewicz [1], showing a satisfactory consistency.