Evaluation of heat transfer coefficient at direct contact condensation of cold water and steam

The estimation of heat transfer coefficient at the direct contact condensation of cold water and steam is very hard, since the phenomena is unsteady and the interface moves complicately. Present research shows the heat transfer coefficient evaluated in the simulation analyses and experiments on the phenomena related to the Loss-of-Coolant Accident of light water reactors. At chugging the heat transfer coefficient was up to 106W/m2K. At condensation oscillation it was between 105-106 W/m2K. At jet region of cold water injected into steam flow it was around 105 W/m2K, and the surface of stratified flow it was between 104-5 x 104 W/m2K. (author)