Research Article
Dec 1980
Approximate Analysis of Unsteady Laminar Flow
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VIEW THE REPLYAuthors: David Stavitsky and Enzo MacagnoAuthor Affiliations
Publication: Journal of the Hydraulics Division
Volume 106, Issue 12
Abstract
Computations of unsteady laminar flows in pipies usually require lengthy calculations due to the complications presented by the exact solutions. In this paper, an alternative approach to the solutions of unsteady laminar flows in pipies is offerd. An approximation to the friction coefficient is made. It is shown that expressing the friction coefficient in terms of the instantaneous Reynolds number results in an approximation for which the error involved is relatively small when compared with available exact solutions. The concept of an average friction coefficient is developed, and its relations to a frequency Reynolds number and to the mean value of the ascillating pressure difference ratio is obtained. By the use of the average friction coefficient, unsteady laminar pipe flow computations can be done in a manner very similar to the steady flow computations.
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Published In
Journal of the Hydraulics Division
Volume 106 • Issue 12 • December 1980
Pages: 1973 - 1980
Copyright
© 1980 American Society of Civil Engineers.
History
Published in print: Dec 1980
Published online: Feb 3, 2021
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Authors
Affiliations
David Stavitsky
Research Engr., RCA Research Center, Princeton, N.J.; formerly Research Assoc., Iowa Inst. of Hyd. Research, The Univ. of Iowa, Iowa City, Iowa
Enzo Macagno
Prof. of Fluid Mechanics, Energy Div., The Univ. of Iowa, Iowa City, Iowa
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