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Pulsating flow in a curved tube

Published online by Cambridge University Press:  29 March 2006

R. G. Zalosh  and
W. G. Nelson
R. G. Zalosh
Affiliation:
Mt Auburn Research Associates, Inc., Newton Upper Falls, Massachusetts
W. G. Nelson
Affiliation:
Mechanical Engineering Department, Northeastern University, Boston, Massachusetts
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Abstract

An analysis is presented of laminar fully developed flow in a curved tube of circular cross-section under the influence of a pressure gradient oscillating sinusoidally in time. The governing equations are linearized by an expansion valid for small values of the parameter (a/R) [Ka/ων]2, where a is the radius of the tube cross-section, R is the radius of curvature, ν is the kinematic viscosity of the fluid and K and ω are the amplitude and frequency, respectively, of the pressure gradient. A solution involving numerical evaluation of finite Hankel transforms is obtained for arbitrary values of the parameter α = a(ω/ν)½. In addition, closed-form analytic solutions are derived for both small and large values of α. The secondary flow is found to consist of a steady component and a component oscillatory at a frequency 2ω, while the axial velocity perturbation oscillates at ω and 3ω. The small-α flow field is similar to the low Dean number steady flow configuration, whereas the large-α flow field is altered and includes secondary flow directed towards the centre of curvature.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 59 , Issue 4 , 7 August 1973 , pp. 693 - 705
Copyright
© 1973 Cambridge University Press

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