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Torque reduction in Taylor–Couette flows subject to an axial pressure gradient

Published online by Cambridge University Press:  13 October 2009

MARCELLO MANNA*
Affiliation:
Dipartimento di Ingegneria Meccanica per l'Energetica, Universitá di Napoli ‘Federico II’, via Claudio 21, 80125 Naples, Italy
ANDREA VACCA
Affiliation:
Dipartimento di Ingegneria Civile, Seconda Universitá di Napoli, via Roma 29, 81031 Aversa (CE), Italy
*
Email address for correspondence: marcello.manna@unina.it

Abstract

The paper investigates the phenomena occurring in a Taylor–Couette flow system subject to a steady axial pressure gradient in a small envelope of the Taylor–Reynolds state space under transitional regimes. A remarkable net power reduction necessary to simultaneously drive the two flows compared to that required to drive the Taylor–Couette flow alone is documented under non-trivial conditions. The energy transfer process characterizing the large-scale coherent structures is investigated by processing a set of statistically independent realizations obtained from direct numerical simulation. The analysis is conducted with an incompressible three-dimensional Navier–Stokes flow solver employing a spectral representation of the unknowns.

Type
Papers
Copyright
Copyright © Cambridge University Press 2009

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