壁面近傍を上昇する微小変形気泡に働く揚力 : 流体工学 , 流体機械

概要

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Lift force on a slightly deformed bubble rising near a plane wall was measured experimentally. We developed an experimental apparatus in which a CCD camera with a microscope follows the rising bubble. We used it to precisely measure the bubble radius (R), the rising speed (U), the distance between the bubble and the wall (L) and the deformation of the bubble, and then estimated the lift force including the effect of both the inertia and the deformation. We also analytically estimated the deformation and the lift force due to the deformation under the Stokes approximation. We compared the analytical solutions with the experimental results. The results show that the deformation can be expressed as a function of the Capillary number defined by the R, the U, the L and the surface tension and the experimental and analytical values are in the same order. They also show that the lift force estimated by the analytical solutions is smaller than the force estimated by the experimental values.
一般社団法人日本機械学会の論文
2001-02-25