Abstract
When gas was injected into a cylindrical bath through a centered bottom nozzle, a bubbling jet was formed above the nozzle. It swirled around the bath axis under a certain condition. The liquid in the bath also swirled in phase with the swirl motion of the bubbling jet. Such a swirl motion of the bubbling jet has a high mixing ability. A similar swirl motion appeared when a liquid or a mixture of gas and liquid was injected in a cylindrical bath. The occurrence conditions of these swirling jets were experimentally investigated in addition to their basic characteristics such as the period and amplitude.
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