| Bubble moving in liquid is widely found in nature and industry. The research on bubble motion characteristics and heat and mass transfer is beneficial for deep understanding of many reality phenomena. Bubble movement belongs to the common two-phase flow. In recent years, the two-phase interface tracking is one of the hot and difficult problems in the thermal physics field. So, exploring the way to capture the gas-liquid interface has an important academic significance.The lattice Boltzmann method (LMB) is a new computational fluid dynamic method developed in recent years. It is from the microscopic point to study the laws of fluid motion and adopts specific rule to get the evolution of macroscopic physical quantities. It’s simple and easy to capture the two-phase interface. On the basis of previous studies, this paper uses LBM to study the characters and the heat and mass transfer of single vapor bubble rising along an inclined surface.First, we examined the characteristics of bubble moving along the inclined surface in the isothermal system. To verify the program, the two classic examples-Poiseuille flow and Laplace’s law were simulated. Then, we studied the bubble motion in a vertical pipeline and compared with the VOF method results. Next, the research on bubbles’motion along an inclined surface is taken. The concerned bounce-back and bounce-back scheme were adapted for inclined surface and the others separately. And the concerned LGA format was selected to treat the extend forces. The influence on bubble deformation and the vertical distance between bubble centroid and surface, which is caused by initial bubble diameter, Eotvos number and inclination angle, was studied. And the relationship between the bubble movement speed, inclination angle and Eotvos number with the same bubble initial diameter was also explored.Next we studied the characters and heat and mass transfer of vapor bubble rising in the superheated system and took Inamuro model to describe the temperature field. We first simulated the square cavity natural convection to verify the program. Then, we explored the bubble movement in a vertical pipeline. The results show that the bubble deformation and temperature field are interaction with the Eotvos number, inclined angle and viscosity. Finally, we studied the bubble motion along an inclined surface. The effects of different inclined angle and Jacob number on vapor bubble’s volume, speed and the evolution of the temperature field were researched. In this part, the concerned bounce-back and bounce-back scheme are used to describe the inclined surface and the others respectively, while the concerned LGA format was selected to deal the extend forces. |
