Abstract
It is well-known that a rising velocity of a nearly spherical bubble in contaminated liquid is much smaller than that of a bubble in a pure liquid and is almost the same as that of a solid particle. This phenomenon is explained by Marangoni Effect due to the variation of surface tension along the bubble surface. In the present study, this effect is analyzed both experimentally and numerically. The experiments are conducted with superpurified water. The effect of molecular structure difference is studied, using 1-pentanol, 3-pentanol and Triton X-100 as a surfactant. Although 1-pentanol and 3-pentanol have the same molecular weight, bubble behaviors with 1-pentanol solution is different from those with the 3-pentanol, due to the different characteristic of adsorption and desorption kinetics. Because the adsorption/desorption ratio is large, Triton X-100 has much stronger effect of reducing the rising velocity than pentanols under the same amount of concentration. The numerical simulations are also conducted for the motion of a single spherical bubble in water with surfactant dissolution, using a boundary-fitted grid. The results show good agreement with those of experiment and the drag coefficient varied gradually from that of purified liquid to that of solid sphere, with the slight increase of the surfactant amount.
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