Simulation of Heat Transfer during Injection of Annular Gas-Droplet Jet into Turbulent Cross-Flow

A numerical analysis of the flow structure and thermal efficiency of a gas-droplet jet injected through a radial annular slot into a single-phase air cross-flow has been performed. The calculations were carried out via the axisymmetric RANS approach for the following range of the main parameters of a two-phase flow: the initial size of water droplets d(1) = 0-20 mu m and their mass concentration M-L1 = 0-0.1. Gas turbulence was described in a model of transfer of the Reynolds stress components for a two-phase flow. Because of the presence of evaporating liquid droplets, even at relatively small mass concentrations not exceeding 5% of the mass of the secondary flow, the thermal efficiency during transverse injection could more than double compared to the injection of a single-phase radial jet.