Role of wall temperature on cavitation bubble collapse near a wall investigated using thermal lattice Boltzmann method. (May 2022) - Yang, Yu
Abstract: The thermal lattice Boltzmann method can be adopted to simulate cavitation bubble collapse in heating or cooling systems. The numerical results satisfy Laplace's law and are consistent with temperature solutions derived from the Rayleigh–Plesset equation. In this paper, in order to study the effects of wall temperature on a collapsing bubble, a calculation model for a cavitation bubble near the heated/cooled wall is established. The influence mechanism of the micro-jet and the cavitation bubble itself on the solid-wall heat transfer, and the thermodynamic behavior characteristics of the cavitation bubble collapse near the wall are obtained. Adjusting the wall temperature T w also affects the thermal effects of cavitation. Furthermore, A dimensionless temperature parameter η is introduced to study the heat transfer intense of the model. The influence of λ, Δ p and R 0 on the heat transfer intense are studied and analyzed. The results show that the optimal λ, Δ p, R 0 and T w values can be used to enhance heat transfer and realize heating or cooling treatment of different surfaces. Highlights: Analysis of cavitation bubble in a heating or cooling system is presented by a thermal lattice Boltzmann method. The influence mechanism of the micro-jet and the cavitation bubble itself on the solid wall heat transfer. The changes of Tw under different initial wall temperature are analyzed. A dimensionless parameter η is introduced to study the heat transfer intense, which is related to the λ, Δ p and R 0 . The optimal λ, Δ p, R 0 and T w are used to realize heating or cooling treatment of different surfaces.