Numerical simulation on heat transfer characteristics of unstable steam jet condensation under rolling condition

Direct contact condensation technology has been widely used in nuclear power, aerospace, chemical industry, and other fields due to efficient mass and heat transfer characteristics between two phases. Rolling motion applied to offshore cases typically significantly affects dynamic flow and heat transfer characteristics. Thus, investigating the heat transfer characteristics of unstable steam jet condensation is necessary. The present study numerically explored the heat transfer coefficient of main and detached bubbles under rolling and static conditions. The relationship between pressure and heat transfer coefficient was assessed to reveal the pressure generation mechanism. The peak value of pressure oscillation was mainly caused by the rapid collapse induced by intense condensation of detached bubble instead of main bubble. The heat and mass transfer intensity could be fortified under rolling conditions. It would increase as the maximum rolling amplitude rise and the rolling period decrease, while the maximum improvement was up to 30%.