Exact solutions for unsteady axial Couette flow of a fractional Maxwell fluid due to an accelerated shear
Articles
Muhammad Athar
GC University, Pakistan
Corina Fetecau
Technical University of Iasi, Romania
Muhammad Kamran
COMSATS Institute of Information Technology, Pakistan
Ahmad Sohail
GC University, Pakistan
Muhammad Imran
GC University, Pakistan
Published 2011-04-25
https://doi.org/10.15388/NA.16.2.14101
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Keywords

fractional Maxwell fluid
exact solutions
velocity field
shear stress

How to Cite

Athar, M. (2011) “Exact solutions for unsteady axial Couette flow of a fractional Maxwell fluid due to an accelerated shear”, Nonlinear Analysis: Modelling and Control, 16(2), pp. 135–151. doi:10.15388/NA.16.2.14101.

Abstract

The velocity field and the adequate shear stress corresponding to the flow of a fractional Maxwell fluid (FMF) between two infinite coaxial cylinders, are determined by means of the Laplace and finite Hankel transforms. The motion is produced by the inner cylinder that at time t = 0+ applies a shear stress fta (a ≥ 0) to the fluid. The solutions that have been obtained, presented under series form in terms of the generalized G and R functions, satisfy all imposed initial and boundary conditions. Similar solutions for ordinary Maxwell and Newtonian fluids are obtained as special cases of general solutions. The unsteady solutions corresponding to a = 1, 2, 3, ... can be written as simple or multiple integrals of similar solutions for a = 0 and we extend this for any positive real number a expressing in fractional integration. Furthermore, for a = 0, 1 and 2, the solutions corresponding to Maxwell fluid compared graphically with the solutions obtained in [1–3], earlier by a different technique. For a = 0 and 1 the unsteady motion of a Maxwell fluid, as well as that of a Newtonian fluid ultimately becomes steady and the required time to reach the steady-state is graphically established. Finally a comparison between the motions of FMF and Maxwell fluid is underlined by graphical illustrations.

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