International Journal of Fluid Mechanics Research

ISSN for PRINT: 1064-2277

For Online Access

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2005, Volume32

Issue 4

130 pages

DOI: 10.1615/InterJFluidMechRes.v32.i4

Issue price - $270.00

GORACHAND LAYEK
University of Burdwan

Swati Mukhopadhyay
M.U.C. Women's Ccollege, Burdwan

Sk. A. Samad
Department of Mathematics, The University of Burdwan, Burdwan - 713104, W.B., India

The unsteady incompressible Navier-Stokes equations are solved numerically in primitive variables (pressure and velocity) for calculating the flow variables in a tube with multiple constrictions under the axi-symmetric approximations. The computation is carried over by taking a suitable transformation for multiple constrictions. The effects of multiple constrictions on a viscous flow field are investigated. The disturbances created by the constrictions are mainly concentrated in the exit of the last constriction. It is found that over the entire Reynolds number ranges studied here, the flow in the downstream of the constrictions is dominated by the strong recirculating flow associated with a shear layer. Oscillatory flow has been noted at the Reynolds number 175 for 75 % area reduction in four consecutive constrictions in a tube. The streamwise velocity components at different points in the downstream of the constrictions oscillate with frequency 1.1. The computed wall shear stress, pressure, and stream lines are also noted fluctuating in the downstream of the constrictions. The flow characteristics (such as central line velocity, pressure distribution, wall shear stress, and stream lines at different Reynolds numbers) are shown graphically, and their consequences in the human cardiovascular system are discussed at length.

DOI: 10.1615/InterJFluidMechRes.v32.i4.20 Download article, 402-419 pages

Article price - $35.00

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