Abstract
The flow pattern produced by a sphere freely sinking to the neutral buoyancy horizon in a continuously stratified liquid is visualized with different schlieren methods. Dispersion of light in the brine produces colouring of conventional schlieren images when cutting diaphragm is at the edge of blade or thread and is used to form “natural rainbow” colour schlieren image. With sensitive schlieren methods a new structural element is distinguished in the flow pattern. That is a narrow jet covered with a high gradient envelope forming in the neighbourhood of the turning points on the trajectory of the oscillating body. Due to the interaction of the body with the emitted internal waves, and also with the wake and secondary jets, the rate of amplitude damping decreases with time
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Yuli Dmitrievich Chashechkin: He received his Eng degree in theoretical nuclear physics in 1964 from Moscow Engineering-Physics Institute, and his Dr. of Sci. (Math and Phys) in the Institute for Problems in Mechanics of the RAS in 1981. He worked in the Russia Metrology Service and has received current position of the Laboratory of Fluid Mechanics Head at the Institute for Problems in Mechanics in 1981. He is professor of the M.V. Lomonosov Moscow State University from 1987. His research interest in geophysical fluid mechanics includes optic and acoustic visualisation, theory of free stratified flows.
Vladimir Viktorovich Levitskiy: He received his Eng degree in testing of flying vehicles in 1978 from Moscow Aviation Institute, and his Kand. of Sci. — Math and Phys (Ph.D.) in the Institute for Problems in Mechanics of the RAS in 2001. He worked in the Russia Construction Bureau and has received current position of Senior Research Scientist in the Laboratory of Fluid Mechanics at the Institute for Problems in Mechanics in 1983. His research interest covers testing of optic visualisation instruments, experimental study of internal waves and multicomponent convection in stratified fluids.
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Chashechkin, Y.D., Levitskiy, V.V. Pattern of flow around a sphere oscillating an neutrally buoyancy horizon in a continuously stratified fluid. J Vis 6, 59–65 (2003). https://doi.org/10.1007/BF03180965
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DOI: https://doi.org/10.1007/BF03180965