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S. Asghar

Bio: S. Asghar is an academic researcher from Quaid-i-Azam University. The author has contributed to research in topics: Plane (geometry) & Diffraction. The author has an hindex of 12, co-authored 24 publications receiving 505 citations. Previous affiliations of S. Asghar include COMSATS Institute of Information Technology.

Papers
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TL;DR: In this article, exact analytic solutions for a class of unsteady unidirectional flows and the frictional forces of an incompressible second grade fluid are obtained, and the periodic Poiseuille flow and frictional force due to an oscillating pressure gradient are examined.

92 citations

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TL;DR: In this article, the peristaltic flow of a fourth grade fluid in a channel under the considerations of long wavelength and low-Reynolds number is examined in a wave frame of reference moving with velocity of the wave.

62 citations

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TL;DR: In this paper, the Laplace transform was used to solve the governing initial value problem of a second-grained fluid bounded by a porous disk, and the analysis of the obtained results showed that the flow field is appreciably influenced by the material parameter of the second grade fluid.

56 citations

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TL;DR: In this article, an analytic solution for the incompressible third-grade fluctuating flow over an infinite porous plate in a rotating medium is obtained, and the resulting velocity profile, drag and the lateral stress on the plate are calculated.
Abstract: Analytic solution for the incompressible third-grade fluctuating flow over an infinite porous plate in a rotating medium is obtained. The resulting velocity profile, drag and the lateral stress on the plate are calculated. Some comments on symmetric and asymmetric nature of the solutions are given in the conclusion.

46 citations

Journal ArticleDOI
TL;DR: The unsteady flow of a viscous electrically conducting fluid bounded by a porous disks in the presence of a uniform magnetic field has been studied and exact analytic solution for the flow generated by arbitrary periodic oscillation of a porous disk is obtained.

38 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the influence of heat transfer and magnetic field on the peristaltic flow of Newtonian fluid in a vertical annulus under a zero Reynolds number and long wavelength approximation is discussed.

397 citations

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TL;DR: In this article, the authors analyzed the MHD flow of a conducting couple stress fluid in a slit channel with rhythmically contracting walls and derived analytical expressions for the stream function, the magnetic force function, axial pressure gradient, the axial induced magnetic field and the distribution of the current density across the channel using long wavelength approximation.

267 citations

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TL;DR: In this article, the Fourier sine transforms are used to obtain exact solutions corresponding to the motions of a second grade fluid, due to the cosine and sine oscillations of an infinite flat plate as well as those induced by an oscillating pressure gradient.

224 citations

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TL;DR: In this paper, exact solutions for the following five problems of an Oldroyd-B fluid are obtained: (i) Stokes problem (ii) modified Stokes Problem (iii) the time-periodic Poiseuille flow due to an oscillating pressure gradient (iv) the non-periodical flows between two boundaries, and (v) symmetric flow with an arbitrary initial velocity.

193 citations

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TL;DR: In this paper, the influence of an endoscope on the peristaltic flow of a couple stress fluid in an annulus under a zero Reynolds number and long wavelength approximation is discussed.
Abstract: This paper discusses the influence of an endoscope on the peristaltic flow of a couple stress fluid in an annulus under a zero Reynolds number and long wavelength approximation. The inner tube is uniform, rigid, while the outer tube has a sinusoidal wave traveling down its wall. Analytical expressions for the axial velocity, stream function and axial pressure gradient are established. The flow is investigated in a wave frame of reference moving with the velocity of the wave. Numerical calculations are carried out for the pressure rise, frictional forces and trapping. The features of the flow characteristics are analyzed by plotting graphs and discussed in detail.

192 citations