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Extended Stokes series: laminar flow through a loosely coiled pipe

Published online by Cambridge University Press:  12 April 2006

Milton Van Dyke
Milton Van Dyke
Affiliation:
Department of Mechanical Engineering, Stanford University, Stanford, California 94305
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Abstract

Dean's series for steady fully developed laminar flow through a toroidal pipe of small curvature ratio has been extended by computer to 24 terms. Analysis suggests that convergence is limited by a square-root singularity on the negative axis of the square of the Dean number. An Euler transformation and extraction of the leading and secondary singularities at infinity render the series accurate for all Dean numbers. For curvature ratios no greater than $\frac{1}{250} $, experimental measurements of the laminar friction factor agree with the theory over a wide range of Dean numbers. In particular, they confirm our conclusion that the friction in a loosely coiled pipe grows asymptotically as the one-quarter power of the Dean number based on mean flow speed. This contradicts a number of incomplete boundary-layer analyses in the literature, which predict a square-root variation.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 86 , Issue 1 , 15 May 1978 , pp. 129 - 145
Copyright
© 1978 Cambridge University Press

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