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Titre :
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Distributions de la vitesse et fluctuations d'un écoulement tourbillonnaire de Taylor
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Titre original:
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Velocity distributions and fluctuations in a Taylor vortex flow
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Auteurs :
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S. Imao ;
Y. Yamada ;
M. Itoh
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Type de document :
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article/chapitre/communication
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Année de publication :
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1989
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Format :
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1546-1552
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Langues:
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Japonais
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Mots-clés:
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MECANIQUE DES FLUIDES
;
ECOULEMENT TURBULENT
;
VITESSE D'ECOULEMENT
;
PROPAGATION D'ONDE
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Résumé :
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Velocity distributions and fluctuations in a Taylor vortex flow between concentric cylinders in which the inner cylinder rotates (a circular Couette system) are investigated by means of a flow-visualization technique and hot-wire measurements. The experiments are performed up to Re/Re sub c=10 in a system where the Reynolds number Re is slowly increased at a constant rate. It is found that both the dimensionless wavelength and the number of travelling azimuthal waves become large as the radius ratio approaches 1. Wave speed decreases rapidly with an increase in Re and becomes constant ; it is smaller than the fluid velocity at the mean radius. The amplitude of waves at the source is larger than that at the sink. The highest peak of the velocity power spectrum does not always correspond to the wave frequency.
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Source :
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Nippon kikai gakkai rombushu, vol.55, n°514
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