The influence of heat transfer regime and jet parameter on film flow in jet impingement boiling

Liquid rocket engines utilize jet impingement on walls to form liquid films, which can undergo boiling when subjected to the effect of heat soak back. This study employs the Eulerian multiphase model coupled with the Rensselaer Polytechnic Institute (RPI) model to numerically investigate this phenomenon. The effects of heat transfer regime on liquid film are examined, as well as the effects of inclination angle, flow rate, and subcooling degree. Results show that liquid convection, nucleate boiling, and transition boiling are the dominant heat transfer regimes. The transition from liquid convection to nucleate boiling significantly influences the velocity and temperature profiles of the liquid film, both of which exhibit two-segment characteristics. The impact of boiling on the mass of liquid film is negligible. The inclination angle and flow velocity moderately affect the velocity decline rate and temperature rise rate. Increasing the flow rate may effectively eliminate the influence of heat soak back.