壁近傍を上昇する水中気泡に働く低レイノルズ数域における揚力(流体工学,流体機械)

概要

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Lift force on a spherical gas bubble rising near a wall in water was measured experimentally below Reynolds number (Re) of 20. 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 for Re<20. 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. The results reveal that the lift force can be expressed by the analytical solution for Re<1. However, in the regime of Re>1, the experimental values are larger than the analytical values and the lift force should be expressed by a function of Re and L^*. We also proposed a predicting equation for the lift force as a function of Re and L/R by fitting the experimental data.
社団法人日本機械学会の論文
2002-06-25