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Structure of the transient wall-friction law in one-dimensional models of laminar pipe flows

Published online by Cambridge University Press:  20 April 2006

J. L. Achard
Affiliation:
Institut de Méanique do Grenoble, B.P. 53 X, 38041, Grenoble Cedex
G. M. Lespinard
Affiliation:
Institut de Méanique do Grenoble, B.P. 53 X, 38041, Grenoble Cedex

Abstract

The problem of describing an unsteady cylindrical pipe flow with one-dimensional equations is investigated, and an exact method for obtaining a closure relationship is proposed for the transient shear stress in a laminar flow submitted to an arbitrary transient pressure gradient. Extensive comparisons are given for a step or a harmonic pressure gradient between the approximate solution derived from this method, some results of the literature and exact solutions of the Navier–Stokes equations.

Type
Research Article
Copyright
© 1981 Cambridge University Press

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