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The flow around a sphere descending at constant speed in a very strongly stratified fluid ( $Fr\lesssim 0.2$ ) is investigated by the shadowgraph method and particle image velocimetry. Unlike… Click to show full abstract
The flow around a sphere descending at constant speed in a very strongly stratified fluid ( $Fr\lesssim 0.2$ ) is investigated by the shadowgraph method and particle image velocimetry. Unlike the flow under moderately strong stratification ( $Fr\gtrsim 0.2$ ), which supports a thin cylindrical jet, the flow generates an unstable jet, which often develops into turbulence. The transition from a stable jet to an unstable jet occurs for a sufficiently low Froude number $Fr$ that satisfies $Fr/Re<1.57\times 10^{-3}$ . The Froude number $Fr$ here is in the range of $0.0157
Journal Title: Journal of Fluid Mechanics
Year Published: 2019
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