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Magneto-hydro-dynamic unsteady second-grade fluid flow for Stokes' problem

100%

Mohyuddin M. R. , Ali Mirza A. , Siddiqui A. M.

International Journal of Applied Mechanics and Engineering

2007

tom Vol. 12, no 4

1061-1072

The present note discusses the flow of an unsteady second-grade fluid oscillating on a plate. The magnetic field is applied perpendicular to the flow field in two cases (i) when it is fixed to the fluid, and (ii) when it is fixed to the boundary. The applied magnetic field is found to slow down the flow for the case when it is fixed to the fluid whereas this effect is reversed in the case when it is fixed to the plate. The physical interpretation of the physical parameters is presented graphically and is compared with the already known results.

Unsteady MHD flow due to eccentrically rotating porous disk and a third grade fluid at infinity

100%

Hayat T. , Nadeem S. , Asghar S. , Siddiqui A. M.

International Journal of Applied Mechanics and Engineering

2006

tom Vol. 11, no 2

415-419

This study looks the series solution for the flow of a third grade fluid in a rotating frame. The flow is induced by non-coaxial rotations of porous oscillating disk and a fluid at infinity. It is noted that the obtained expressions for velocity components are valid for all values of the frequencies.

Some more inverse solutions for steady flows of a second-grade fluid

100%

Siddiqui A. M. , Mohyuddin M. R. , Hayat T. , Asghar S.

Archives of Mechanics

2003

tom Vol. 55, nr 4

373-387

Inverse solutions of the equations of motion of an incompressible second-grade fluid are obtained by assuming certain forms of the stream function. Expressions for streamlines, velocity components and pressure distributions are given in each case and compared with the known results.

Non-Newtonian flows over an oscillating plate with variable suction

100%

Hayat T. , Abbas Q. , Khan M. , Siddiqui A. M.

Archives of Mechanics

2003

tom Vol. 55, nr 4

327-344

The flow of second order fluid due to an oscillating infinite plate in the presence of a transverse magnetic field for two forms of time-depend suction are considered. The analytical solution of the governing boundary value problems are obtained. It is found that an external magnetic field and normal stress coefficient on the flow has opposite effects.

The unsteady Couette flow of a second grade fluid n a layer of porous medium

100%

Hayat T. , Khan M. , Ayub M. , Siddiqui A. M.

Archives of Mechanics

2005

tom Vol. 57, nr 5

405--416

In this work, the two Couette flows of a second grade fluid are discussed in a porous layer when (i) bottom plate moves suddenly (ii) bottom plate oscillates. Laplace transform method is used to determine the analytic solutions. Expressions for the velocities, volume fluxes and frictional forces are constructed.