Numerical simulation of bubble collapse and the transfer of vapor and noncondensable gas through the bubble interface using the ghost fluid method

9th International Symposium on Cavitation

Jinbo, Y.^1 ; Kobayashi, K.^1 ; Watanabe, M.^1 ; Takahira, H.^2

Division of Mechanical and Space Engineering, Hokkaido University, Sapporo

060-8628, Japan^1

Department of Mechanical Engineering, Osaka Prefecture University, Sakai

599-8531, Japan^2

关键词: Compressible liquid;    Gas-liquid interface;    Ghost fluid method;    Heat and mass transfer;    Mixture components;    Non-condensable gas;    Nonequilibrium phase transitions;    Vapor condensation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012021/pdf
DOI  :  10.1088/1742-6596/656/1/012021

来源: IOP

【 摘 要 】

The ghost fluid method is improved to include heat and mass transfer across the gas- liquid interface during the bubble collapse in a compressible liquid. This transfer is due to both nonequilibrium phase transition at the interface and diffusion of the noncondensable gas across the interface. In the present method, the ghost fluids are defined with the intention of conserving the total mass, momentum, and energy, as well as the mass of each component while considering the heat and mass fluxes across the interface. The gas phase inside the bubble is a mixture of vapor and noncondensable gas, where binary diffusion between the mixture components is taken into account. The gas diffusion in the surrounding liquid is also considered. This method is applied to a simulation of a single spherical bubble collapse with heat and mass transfer across the interface in a compressible liquid. When noncondensable gas is present, it accumulates near the interface due to vapor condensation, thereby preventing further condensation. This results in a weaker bubble collapse than the case without noncondensable gas.