ESTIMATION OF VORTEX STRUCTURE SIZES IN AN ANNULAR FLOW OF A COUETTE - TAYLOR SYSTEM VIA AMPLITUDE-FREQUENCY SPECTRA OF PRESSURE PULSATIONS
V. N. Mamonov, N. B. Miskiv, A. D. Nazarov, A. F. Serov, V. I. Terekhov
Kutateladze Institute of Thermophysics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: Couette - Taylor system, annular gap, radial dynamic pressure pulsations, pressure pulsation amplitude-frequency spectrum, vortex structure, vortex size
Abstract
A method and technical instrumentation are proposed for estimating the sizes of vortex structures generated in the annular gap of a Couette - Taylor system. The size estimation of these structures is based on analyzing the measured amplitude-frequency spectra of radial dynamic pressure pulsations. A simplified model of vortex generation in the Couette - Taylor annular flow, driven by the rotation of the inner cylinder surface, is introduced. Using this model and the measured amplitude-frequency spectra of radial pressure pulsations, the sizes of the generated vortices in the Couette - Taylor flow are evaluated. The results reveal three distinct types of vortices: vortices with diameters significantly smaller than the annular gap width, vortices with diameters comparable to the gap width, and vortices with diameters substantially exceeding the gap width, leading to their deformation (flattening).
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