壁面近傍を上昇する球形ガス気泡に働く揚力

概要

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Lift force on a spherical gas 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, the rising speed and the distance between the bubble and the wall (L) and then estimate the lift force below Reynolds number (Re) of 50. We also proposed the equation for estimating the lift force by modifying the analytical solution obtained under the Oseen approximation and compared with the experimental results. When the Reynolds number based on L (L^*=LU/ν) is larger than 1, the lift force is expressed as a function of Re and L^*. In the regime of 1<L^*<2, the analytical solutions are in good agreement with the experimental results. And in the regime of L>2, the experimental values are larger than the analytical values.
2000-09-25