Effects of inner cylinder rotation on laminar flow of a Newtonian fluid through an eccentric annulus

• Type: Article in International Scientific Journal
• Date: 2000

Authors

M. P. Escudier (Author) Other; I. W. Gouldson (Author) Other; P. J. Oliveira (Author) Other; Fernando Tavares de Pinho (Author) FEUP

Journal

Title: International Journal of Heat and Fluid Flow

Vol. 21 No. 1

Pages: 92-103

ISSN: 0142-727X

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 41 Citations

ISI Web of Science

Scopus - 72 Citations

Other information

Authenticus ID: P-001-0XJ

DOI: 10.1016/s0142-727x(99)00059-4

Abstract (EN): The paper concerns a computational and experimental study of fully developed laminar flow of a Newtonian liquid through an eccentric annulus with combined bulk axial flow and inner cylinder rotation. The results are reported for calculations of the flowfield, wall shear stress distribution and friction factor for a range of values of eccentricity epsilon, radius ratio kappa and Taylor number Ta. For fully developed flow the radial/tangential motion is decoupled from the axial component of velocity. However, the axial component of velocity is directly affected by the radial/tangential velocity field and rotation of the inner cylinder is found to have a strong influence on the axial velocity distribution, ultimately leading to two maxima in the case of a highly eccentred inner cylinder at high rotation speeds, a feature not reported hitherto. This influence of rotation on the axial velocity is mirrored in the behaviour of the shear stresses on the inner and outer cylinder walls and hence on the friction factor. An unexpected result is that (at fixed Reynolds number) as the Taylor number is increased the friction factor for high values of epsilon(> 0.9) increases rather than decreases.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12