Gas Dissolution Process with Chemical Reaction of a Spherical Rising Gas Bubble. 3rd Report, Effects of Ion Concentration Distribution at a BubbleSurface on Rising Speed of a Carbon Dioxide Bubble in Strong Alkaline Solution.

Abstract

Effects of ion concentration distribution at a bubble surface on rising speed of a carbon dioxide bubble in strong alkaline solution was investigated experimentally and numerically. We developed an experimental system that use a CCD camera coupled with a microscope to track the rising bubble and precisely estimated the drag coefficients when a CO, bubble dissolves in sodium hydroxide solution. We also numerically estimated the drag coefficients of the Stagnant Cap Model. The results reveal that we observed that the behavior of the bubble returns to that of a fluid sphere after it is closed to that of a solid particle when the concentration of sodium hydroxide is high. And by comparing the numerical results, the ion concentration distribution at the surface changes the position of the stagnant cap angle and the flow around the bubble.