RANS simulation of heat transfer in a mist turbulent flow over an obstacle

The numerical study of the flow and heat transfer in the two-phase mist flow over a single square obstacle is carried out using Eulerian two-fluid approach. The maximum value of the gas phase turbulence is obtained over the obstacle at x/h = -1-0, and it exceeds the values for the turbulence level before and after the obstacle by more than 50 %. The maximal turbulence suppression for the evaporating droplets in a turbulent stream is reached in the flow core of the channel and the minimal one is observed in the near-wall part. Turbulence suppression in the case of evaporating droplets is extremely low near the wall, and the level of turbulence tends to the corresponding value for the single-phase flow. Compared to the single-phase flow, an up to 15 % reduction in the gas turbulence is obtained. The predicted increase in heat transfer in the mist flow over the obstacle is over 1.5 times.