Modelling of bubble dynamics on vertical rough wall with conjugate heat transfer

Abstract

The wall temperature distribution and wettability greatly influence the bubble dynamics and heat transfer process. In this work, lattice Boltzmann (LB) method is implemented to investigate the bubble dynamics on the vertical rough heating wall, where the conjugate heat transfer process is taken into consideration. The interaction between bubble dynamics and boiling heat transfer characteristics is revealed. The results reveal that the bubble motion and the gas–liquid interface are dependent on the wall thermal conductivity. A high wall thermal conductivity will cause the gas film to cover the wall surface and hinder the heat transfer process. Moreover, the influence of the wall mixed wettability on the conjugate heat transfer behaviors is also analyzed. The findings demonstrate that the step wall wettability can promote the nucleation efficiency so as to achieve the enhancement of the wall heat transfer.