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Indexed by:期刊论文

Date of Publication:2015-01-01

Journal:PROGRESS IN NUCLEAR ENERGY

Included Journals:SCIE、EI、Scopus

Volume:78

Page Number:201-215

ISSN No.:0149-1970

Key Words:Subsonic steam; Direct-contact condensation; Condensation model; Numerical simulation; Pressure oscillation

Abstract:The direct-contact condensation (DCC) of subsonic steam injected into a subcooled water pool has been simulated using the Volume of Fluid (VOF) multiphase flow model and Large Eddy Simulation (LES) turbulent flow model of FLUENT. A thermal equilibrium model has been introduced to simulate the phenomenon of DCC. The condensation model is a two resistance model which takes care of the heat transfer process on both sides of the interface. The numerical results for the steam plume can be divided into four stages: the initial stage, the maximum stability stage, the oscillatory stage and the detachment stage. Fairly good qualitative agreement was obtained with the available experimental data for the plume shape and evolution characteristics of the steam plume. In addition, it was found that the centerline axial temperature increases with the decrease of the centerline axial velocity at the pipe exit and the pressure oscillation is mainly affected by the steam velocity, steam condensation and subcooled water hydrostatic pressure. (C) 2014 Published by Elsevier Ltd.