上昇球形ガス気泡の化学反応を伴う溶解過程に関する研究 : 第1報, 強アルカリ性溶液への二酸化炭素気泡の溶解速度の実験的測定

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Gas dissolution process with chemical reaction of a spherical rising gas bubble was investigated experimentally. 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 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 when a carbon dioxide bubble dissolves in sodium hydroxide with chemical reactions. And we also estimated the dissolution rate of the bubble in alkaline solution using the numerically estimated dissolution rate in water when we assumed that the chemical equilibrium attained at the gas-liquid interface. We compared the numerical values with the experimental ones and the results show that the chemical equilibrium does not attain at the surface when the concentration of sodium hydroxide is higher than 0.1 mol/1.
2000-11-25