Gas-liquid interface of a bubble in sodium hydroxide solution

摘要

Gas-liquid interface of a bubble in sodium hydroxide solutions 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 rising speed from the bubble motion data captured by a personal computer, we could precisely estimate the drag coefficients of a carbon dioxide bubble in the sodium hydroxide solutions. We also numerically estimated drag coefficients of the “Stagnant Cap Model” by directly solving the Navier-Stokes equation .We compared the results with the measured rising speed and observed that the behavior of the bubble returns to that of a fluid sphere after it approaches that of a solid particle when the concentration of sodium hydroxide is as high as 1 mol/1.