NUMERICAL SIMULATION OF LIQUID ENTRAINMENT BY THE RAYLEIGH-TAYLOR MECHANISM
A matter of interest for the modelling of low probability whole core accidents in liquid metal-cooled fast breeder reactors is the entrainment of liquid coolant within the expanding bubble of hot gases produced within the core region. The entrained droplets can evaporate rapidly and so contribute to the bubble pressure and to the mechanical work done during the expansion. Under the assumption that the main entrainment mechanism is the Rayleigh-Taylor instability at the accelerating interface estimates have been made by several authors of the entrainment rate, based on dimensional arguments and on data from plane two-dimensional experiments. This paper describes the direct simulation of the growth of an axisymmetric Taylor spike using a boundary integral method, from the results of which it is concluded that the effective entrainment rate is significantly lower than has been estimated from the plane experiments. A stabilizing mechanism is identified associated with the stretching of the interface as the spike grows, and shown to be capable of explaining the observed difference in entrainment rates between the plane and axisymmetric cases.
Bibliographic Reference: 4TH MIAMI INTERNATIONAL SYMPOSIUM ON MULTIPHASE TRANSPORT AND PARTICULATE PHENOMENA, MIAMI BEACH, FLORIDA (USA), DEC. 15-17, 1986 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32884 ORA
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Record Number: 1989125031300 / Last updated on: 1987-03-01
Available languages: en