Flow Structure and Turbulent Heat and Mass Transfer at the Stagnation Point of an Impact Impulse Gas-Droplet Flow

Heat transfer in a impulse impact gas–droplet jet was investigated numerically using the Reynolds stress transport model. It is shown that such a flow is characterized by both an increase and a decrease in the heat transfer, as compared to a steady impact gas–droplet flow. It is also shown that, as the frequency of pulses increases, the heat transfer initially increases in comparison to a steady jet, while at higher frequencies, the jet is characterized by a decrease in the heat transfer. An increase in the Reynolds number causes a decrease in the heat transfer intensification, and the Nusselt number distribution for all frequencies approaches the single–phase flow regime.