水中における上昇球形ガス気泡の溶解過程に対する汚れの影響 (<小特集>マイクロスケールの流体・熱流動現象)

概要

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The effects of contamination on gas dissolution process of a spherical rising gas bubble in water was investigated experimentally and numerically. We developed an experimental system that use a CCD camera coupled with a microscope to track the rising bubble. By measuring the bubble size and the rising speed from the bubble motion data captured by a personal computer, we could precisely estimate the drag coefficients and the Sherwood number for the dissolution of gas bubbles in the transient regime where the bubble changes from behaving as a fluid sphere to behaving as a solid particle. We also numerically estimated drag coefficients and Sherwood number of "the Stagnant Cap Model" by directly solving the Navier-Stokes equation and the convection diffusion equation. The experimental and numerical results are in good agreement and clarified the mechanism of the transient process where the bubble behavior changes from that of a fluid sphere to that of a solid particle.
1999-02-25