RANS simulations of a turbulent flow structure and convective heat transfer in a bubbly jet impingement

A flow structure and turbulent heat transfer of a bubbly impinging jet are studied numerically. A set of RANS equations for the two-phase flow is utilized. The dispersed phase is modeled by the Eulerian approach. Gas turbulence is computed with the Reynolds stress model for two-phase flow. The effects of bubbles size and gas flow rate ratio, distances between pipe outlet and impinging flat plate and Reynolds number on heat transfer modification are numerically carried out. It is shown the increase of heat transfer in the two-phase impinging jet (up to twice times in comparison with single-phase one). The impingement heat transfer rate initially increases with distance from the pipe edge and target surface and the heat transfer decreases at large distance from the pipe edge and flat plate.