Study On Drag Coefficient For the Particle/droplet with Vapor Film

Cao, X.; Tobita, Yoshiharu

The fuel coolant interaction (FCI) phenomena are characterized by a configulation that a hot particle/droplet surrounded with vapor film moves in coolant liquid. A drag correlation has not been developed for such a configulation. In this study, based on the bzsic conservative equation, the drag coefficients between a single hot particle/droplet and the surroundings coolant liquid under laminar and turbulant flow conditions are developed first. The coefficients are expressed as fun-ctions of reynolds number, vapor/liquid viscosity and density rations and the other two dimensionless number newly introduced in this study. The drag coefficients for a multi-particle/droplet system under lami-nar and turbulant flow conditions are then developed based on the abo-ve single hot particle/droplet model and mixtureviscosity concept. The proposed correlations are coupled into the SIMMER-III code and are used to simulate the QUEOS experiment. It is shown that the proposed correlation reasonab