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Exact solutions for the unsteady rotational flow of non-Newtonian fluid in an annular pipe. (English) Zbl 1211.76014
Summary: This paper deals with some unsteady transient rotational flows of an Oldroyd-B fluid in an annular pipe. The fractional calculus approach in the constitutive relationship model of an Oldroyd-B fluid is introduced. A generalized Jeffreys model with the fractional calculus is built. Exact solutions for some unsteady rotational flows of an Oldroyd-B fluid in an annular pipe are obtained by using Hankel transform and the theory of Laplace transform for fractional calculus. The well known solutions for a Navier-Stokes fluid, as well as those corresponding to a Maxwell fluid and a second grade one, appear as limiting cases of our solutions.

76A05Non-Newtonian fluids
26A33Fractional derivatives and integrals (real functions)
Full Text: DOI
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