The effect of low concentrations of surfactants on the characteristics of gas bubbles in a gas-liquid flow in an inclined channel
A.O. Karkhov1,2, M.A. Vorobyov1,2
1Novosibirsk State University, Novosibirsk, Russia
2S.S. Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: inclined pipe, bubbles, surfactants, two-phase flow, drag coefficient
Abstract
Bubble motion in an inclined circular pipe with a cocurrent liquid flow was experimentally studied. The effects of low concentrations of surfactants, the channel inclination angle, and the flow velocity on the size of gas bubbles and their ascent velocities were determined. It was found that the combination of liquid flow and surfactant significantly suppresses bubble coalescence. For the given conditions, the drag coefficient of a bubble rising near the wall was calculated. It was shown that the drag coefficient is inversely proportional to the Weber number both in pure water and with the addition of surfactant.
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