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Titolo:
Influence of precession on velocity measurements in a strong laboratory vortex
Autore:
Wunenburger, R; Andreotti, B; Petitjeans, P;
Indirizzi:
LPS, F-75231 Paris 05, France LPS Paris France 05LPS, F-75231 Paris 05, France ICMCB, F-33608 Pessac, France ICMCB Pessac France F-33608ICMCB, F-33608 Pessac, France LPMMH, F-75231 Paris 05, France LPMMH Paris France 05LPMMH, F-75231 Paris 05, France
Titolo Testata:
EXPERIMENTS IN FLUIDS
fascicolo: 2, volume: 27, anno: 1999,
pagine: 181 - 188
SICI:
0723-4864(199907)27:2<181:IOPOVM>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
10
Recensione:
Indirizzi per estratti:
Indirizzo: Andreotti, B LPS, 24 Rue Lhomond, F-75231 Paris 05, France LPS 24 Rue Lhomond Paris France 05 F-75231 Paris 05, France
Citazione:
R. Wunenburger et al., "Influence of precession on velocity measurements in a strong laboratory vortex", EXP FLUID, 27(2), 1999, pp. 181-188

Abstract

A strong laboratory vortex is generated in a cylindrical cell using a rotating disk and stretched by pumping the fluid out through a hole in the centre of the top of the cell. The velocity field is measured by means of laserDoppler anemometry and Doppler ultrasonic anemometry which are both non intrusive methods. The vortex exhibits a slight precession which induces temporal fluctuations of the velocity at the measurement point. Due to the centrifugal force, the tracers concentrate in a tubular region around the vortex, leading to spatial variations of the measurement counting rate. Under these two effects, the probability density function (PDF) of the one point velocity exhibits a strong non-Gaussian behaviour. In order to access the details of the velocity profile of the vortex in its own system of reference, the influence of the vortex precession, of the spatial variations of the concentration in tracers and of the intrinsic measurement dispersion is investigated and a model is proposed. It allows to recover statistically the characteristics of the vortex and to deduce the trajectory of its centre from the instantaneous velocity profiles.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 02:17:24