Abstract: The aim of this work is to study vortex rings with high buoyancy. Due to the vertical upward injection of a pulsed air jet into water, an air ring is formed, the shape of which is close to a torus, but not stationary in time and inhomogeneous in space. To compare experiments with theory, it is necessary to know the average geometric sizes of the ring. An autonomous method for processing vortex ring’s video images obtained from two mutually perpendicular directions: from the side and from above, has been developed in the Matlab. The proposed technique can be ported to other programming languages and allows to measure dependences of the distance travelled, the core mean radius, the core cross-section mean radius and core volume on time by defining the visual boundaries of the ring from both directions. The technique does not depend on the background uniformity. Necessary condition is a leap in the intensity of the black-and-white image between the background and the entire ring boundary. Visualization was carried out by the shadow image method. The threshold contrast leap in our case was equal to 4. Processing of a colour image is possible after conversion to black and white.

Cite: Chashnikov E.A. , Nikulin V.V.
Determination of the Parameters of a Vortex Ring with an Air Core in a Liquid by Computer Processing of Video Images
Scientific Visualization. 2021. V.13. N3. P.66-74. DOI: 10.26583/sv.13.3.07 Scopus РИНЦ OpenAlex

Identifiers:

Scopus:	2-s2.0-85113421800
Elibrary:	46422318
OpenAlex:	W4231542137

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Scopus	1
OpenAlex	1
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