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ISSN Online: 2377-424X

ISBN Print: 0-89116-130-9

International Heat Transfer Conference 6
August, 7-11, 1978, Toronto, Canada

DIRECT CONTACT CONDENSATION OF FLOWING STEAM ONTO INJECTED WATER

Get access (open in a dialog) DOI: 10.1615/IHTC6.3550
pages 107-112

Resumo

At the cold, water injection during a loss of coolant accident of pressurized water reactor, the violent condensation takes place in the water injection region due to the direct contact of steam with water. In the present study, the flow and heat transfer mechanisms in the injection region are investigated experimentally and analytically, mainly in the steady state.
The results can be summarized as follows: (l). Immediately after the injection, water flows in the shape of two-dimensional jet, and then it is atomized finely and entrained into the main steam flow. The condensation occurs partly due to the water-steam contact on the surface of the jet and mostly due to the droplet-steam mixing. (2). When the injected water is more than the equivalent amount to condense the inflow steam completely, the condensing two-phase flow becomes unstable and oscillatory. (3). Steam and water reaches thermal equilibrium at X = 50 cm already. (4). Pressure distribution in the injection region is determined by the acceleration of injected water in the main flow direction, the convergence rate of steam flow and also the condensation rate.