Effect of non-condensable gas on a collapsing cavitation bubble near solid wall investigated by multicomponent thermal MRT-LBM*

Abstract

A multicomponent thermal multi-relaxation-time (MRT) lattice Boltzmann method (LBM) is presented to study collapsing cavitation bubble. The simulation results satisfy Laplace law and the adiabatic law, and are consistent with the numerical solution of the Rayleigh–Plesset equation. To study the effects of the non-condensable gas inside bubble on collapsing cavitation bubble, a numerical model of single spherical bubble near a solid wall is established. The temperature and pressure evolution of the two-component two-phase flow are well captured. In addition, the collapse process of the cavitation bubble is discussed elaborately by setting the volume fractions of the gas and vapor to be the only variables. The results show that the non-condensable gas in the bubble significantly affects the pressure field, temperature field evolution, collapse velocity, and profile of the bubble. The distinction of the pressure and temperature on the wall after the second collapse becomes more obvious as the non-condensable gas concentration increases.

Numerical Investigations on Temperature Distribution and Evolution of Cavitation Bubble Collapsed Near Solid Wall

“…After the first collapse, a shock wave is emitted toward the solid wall and forms a hot spot on the wall, as has been discussed in Refs. (Yang et al, 2020) and (Yang et al, 2021). As shown in Figure 7F, the bubble becomes toroidal and its internal initial temperature is low.…”

“…Based on this, Shan et al (Shan et al, 2016;Shan et al, 2017;Yang et al, 2020;Yang et al, 2021) adopted the above-mentioned thermal MRT LBM to simulate the collapse of the cavitation bubble near the solid wall. The temperature change and dynamic behavior of the bubble were well captured.…”

Morphological analysis for thermodynamics of cavitation collapse near fractal solid wall

“…The feasibility of establishing the thermodynamic lattice Boltzmann (LB) model is verified by experimental data and numerical calculation. [7,8] On the basis, Liu et al [9] adopted the improve DDF LBM to simulate the evolution process of cavitation bubble under nonisothermal conditions. The thermodynamic mechanism of the bubble growth and collapse under three boundary conditions of infinite domain, flat wall, and convex wall is studied.…”

Thermodynamic effects of gas adiabatic index on cavitation bubble collapse

“…In terms of research on cavitation bubble thermodynamics, Yang et al first established a thermodynamic model of cavitation bubble collapsing by using the improved thermal DDF-LBM [ 43 , 44 ]. Moreover, a multicomponent DDF LBM was developed on this basis, and the validity of the model was verified by theoretical and experimental comparison, which can be used for the thermodynamic study of multicomponent multiphase flow [ 45 ]. This work assumes the presence of two gas components, i.e., non-condensable gas and water vapor, inside the cavitation bubble.…”