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The theoretical derivation of the startup laminar flow of incompressible viscous fluid in a long pipe as suggested by Szymanski, could not be verified experimentally. This leads to the checking of assumption of constant pressure gradient across the ends of the pipe, on the basis of which the theoretical development was made. Recently, the problem was again investigated for viscous fluid by Otis. In the present paper, the laminar startup flow of elasticoviscous fluid in a pipe, without assuming constant pressure gradient across its ends, has been investigated. The nonlinear governing equations are solved numerically and the effects of startup flow parameters and elasticoviscous parameter on the velocity distribution have been studied.
Engineering Computations – Emerald Publishing
Published: Jan 1, 1992
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