Numerical simulation on steam bubble condensation based on MPS method

The condensation of single saturated steam bubble in quiescent subcooled water was simulated based on MPS method. The simulation was carried out under different initial bubble pressures and diameters, and the shape formation, bubble equivalent diameter and pressure during condensation were obtained. The initial bubble pressure ranged from 0.1 MPa to 0.5 MPa, and the initial bubble diameter was kept at three different values of 2 mm, 3 mm and 5 mm. The pressure and temperature of the quiescent water was 0.1 MPa and 70°, respectively. The results showed that when the initial bubble pressure difference across phase interphase was zero, the steam bubble was always spherical during condensation, the bubble equivalent diameter decreased and the bubble pressure was almost constant. Otherwise, when the initial bubble pressure difference was larger than zero, the bubble changed from sphere, heart-shape to semi-moon shape during condensation. The bubble pressure and equivalent diameter were in cyclic variations, and the amplitude of variation increased with the initial bubble pressure.