自由界面での単一気泡の合体および反発に関する研究(流体工学,流体機械)

概要

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Bouncing and coalescence between single rising bubble and free surface were experimentally and numerically studied. In experimental study, with Weber number of O(10^<-2>)〜1.7 and Morton number of O(10^<-9>)〜O(10^<-4>), it was observed that both liquid viscosity and bubble diameter are playing the dominant role in coalescence time and bounce/coalescence condition. It was clarified that Weber number is the important parameter in the coalescence time of bubble with free surface in low viscosity liquid. However, in high viscosity liquid, scale of coalescence time was observed significantly different from the one of low viscosity liquid. In numerical study, the full Navier-Stokes equation was solved, by defining two Level Set functions for bubble and free surface respectively. The pressure of liquid film between bubble and free surface, bouncing mechanism and difference of coalescence time scales are discussed.
一般社団法人日本機械学会の論文
2004-04-25