Numerical simulation of bubbly nozzle flow with two-fluid model

The bubbly flows through converging-diverging nozzle were numerically studied using variable step Runge-Kutta scheme, with two-fluid model. Heat interaction between the two phases was introduced in the model. The influence of initial bubble size, initial velocity difference and temperature difference between the two phases to the flow field was investigated by comparing the simulation results. With increasing initial bubble size, the void fraction fluctuates stronger. The initial velocity difference decreases rapidly nearby the nozzle inlet and the pressure increases slightly. Heat transfer coefficient impacts the distribution of gas temperature. The gas temperature approaches to the liquid quickly with larger heat transfer coefficient, and the effect to the flow field is minor.