剛体壁近傍での非球形気泡の力学に関する数値解析 : 内部気体の熱的効果

抄録

The collapse and rebound of a nonspherical gas bubble near a plane rigid wall are investigated using the boundary element method combined with the finite volume method. The temperature gradient of the internal gas is taken into account in the analysis. It is shown that the bubble collapse is accelerated by the heat transfer inside the bubble : Jetvelocity becomes higher than that predicted by the adiabatic model. Thermal damping is important in investigating the characteristics of the rebounding bubble. It is also shown that the temperature distribution inside the bubble is strongly dependent on the degree of deformation of the bubble. When the jet is produced on the bubble wall, the internal temperature gradient at the side farthest from the rigid wall becomes very steep. This steep gradient increases the liquid temperature to a level higher than that for the single bubble.