Abstract
Plumes of air and carbon-dioxide (CO2) bubbles in stratified water were studied experimentally and numerically. It is important to understand the plume behavior of droplets or bubbles in the ocean in marine environmental engineering. In sequestration of CO2 in the ocean, liquid CO2 is injected in the form of droplets, and thermal stratification in enclosed seas is possibly destroyed by a bubble generator. This study focuses on the relationship between intrusion depth and stratification intensity, gas flow rate, and bubble size. A desktop-sized tank was used to achieve no-background-flow conditions for salt stratification. The results from the air-bubble experiments indicated that the larger the bubble size, the smaller the intrusion depth. We also observed the behavior of CO2 bubbles. They are different from air in that they dissolve in water and are reduced in volume. Our numerical simulation method for two-phase flow was validated by comparisons with the experiments.
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