鉛直平板付近を上昇する変形気泡の揚力に対する潤滑効果(反応・多相系混相,一般講演)

概要

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Deformation-induced lateral migration of a bubble slowly rising near a vertical plane wall in a stagnant liquid is numerically and theoretically investigated. In particular, our focus is set on a situation with a short clearance c between the bubble interface and the wall. When the clearance parameter ε(=c/a) is comparable to or smaller than unity, the numerical analysis based on the boundary-fitted finite-difference approach solving the Stokes equation is performed to complement the experiment. To improve the understandings of a role of the squeezing flow within the bubble-wall gap, the theoretical analysis of the small deformation is also performed in the lubrication limit. The present analyses demonstrate the migration velocity scales ∝ Caε^<-1>V_<B1> (here, V_<B1> and Ca denote the rising velocity and the capillary number, respectively) in the limit of ε→0.
日本流体力学会の論文
2009-09-02