Effect of vaporizing droplets on the structure of a submerged spray.

Heat and mass transfer in a gas-droplet spray is investigated numerically using the Eulerian description of both phases. The system of averaged equations for the dispersed phase is based on the kinetic equation for the probability density function of the particle coordinates, velocity, and temperature. With increase in the particle concentration and size, the spray becomes narrower and longer. However, for evaporating sprays, particularly with small droplets, the turbulence suppression and mixing effects are less pronounced than for jets without phase transitions. The strongest turbulence suppression is detected in the initial spray region, where the droplet concentration is maximum and the droplet size is only slightly reduced due to vaporization. [ABSTRACT FROM AUTHOR]