scholarly journals Discussion: “Experimental Investigation of Flow Resistance and Wall Shear Stress in the Interior Subchannel of a Triangular Array of Parallel Rods” (Fakory, M., and Todreas, N., 1979, ASME J. Fluids Eng., 101, pp. 429–434)

1979 ◽  
Vol 101 (4) ◽  
pp. 434-435
Author(s):  
H. G. Lyall
Keyword(s):  
Experimental Investigation ◽  
Shear Stress ◽  
Wall Shear Stress ◽  
Flow Resistance ◽  
Triangular Array ◽  
Wall Shear

scholarly journals Biorheological Model on Flow of Herschel-Bulkley Fluid through a Tapered Arterial Stenosis with Dilatation

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
S. Priyadharshini ◽  
R. Ponalagusamy
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Pressure Gradient ◽  
Power Law ◽  
Flow Resistance ◽  
Velocity Profiles ◽  
Arterial Stenosis ◽  
Axial Distance ◽  
Tapered Artery ◽  
Wall Shear

An analysis of blood flow through a tapered artery with stenosis and dilatation has been carried out where the blood is treated as incompressible Herschel-Bulkley fluid. A comparison between numerical values and analytical values of pressure gradient at the midpoint of stenotic region shows that the analytical expression for pressure gradient works well for the values of yield stress till 2.4. The wall shear stress and flow resistance increase significantly with axial distance and the increase is more in the case of converging tapered artery. A comparison study of velocity profiles, wall shear stress, and flow resistance for Newtonian, power law, Bingham-plastic, and Herschel-Bulkley fluids shows that the variation is greater for Herschel-Bulkley fluid than the other fluids. The obtained velocity profiles have been compared with the experimental data and it is observed that blood behaves like a Herschel-Bulkley fluid rather than power law, Bingham, and Newtonian fluids. It is observed that, in the case of a tapered stenosed tube, the streamline pattern follows a convex pattern when we move fromr/R=0tor/R=1and it follows a concave pattern when we move fromr/R=0tor/R=-1. Further, it is of opposite behaviour in the case of a tapered dilatation tube which forms new information that is, for the first time, added to the literature.

Experimental Investigation of Flow Resistance and Wall Shear Stress in the Interior Subchannel of a Triangular Array of Parallel Rods

1979 ◽  
Vol 101 (4) ◽  
pp. 429-434 ◽  
Author(s):  
M. Fakory ◽  
N. Todreas
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Friction Factor ◽  
Static Pressure ◽  
Reynolds Numbers ◽  
Triangular Array ◽  
Flow Area ◽  
Static Pressure Distribution ◽  
The Common ◽  
Wall Shear

A simulated model of a triangular array of rods with pitch to diameter ratio of 1.1 with air flow was used to study the hydraulic parameters of the liquid metal fast breeder reactor (LMFBR) fuel geometry. The wall shear stress distribution, static pressure distribution, turbulence intensity, and friction factor were measured in the central subchannel from Reynolds numbers of 4 × 103 to 36 × 103. Our results show that the maximum wall shear stress occurs at the largest flow area, the static pressure is not uniform around the rod periphery, there is no detectable presence of secondary flow from the wall shear stress measurements, and the friction factor derived from the measured wall shear stress is less than the common friction factor derived from pressure drop measurement.

Experimental investigation of the wall shear stress in a circular impinging jet

2013 ◽  
Vol 25 (7) ◽  
pp. 077101 ◽  
Author(s):  
M. El Hassan ◽  
H. H. Assoum ◽  
R. Martinuzzi ◽  
V. Sobolik ◽  
K. Abed-Meraim ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Shear Stress ◽  
Wall Shear Stress ◽  
Impinging Jet ◽  
Wall Shear

COUPLE STRESS FLUID MODEL FOR PULSATILE FLOW OF BLOOD IN A POROUS TAPERED ARTERIAL STENOSIS UNDER MAGNETIC FIELD AND PERIODIC BODY ACCELERATION

2017 ◽  
Vol 17 (08) ◽  
pp. 1750109 ◽  
Author(s):  
R. PONALAGUSAMY ◽  
S. PRIYADHARSHINI
Keyword(s):  
Shear Stress ◽  
Wall Shear Stress ◽  
Newtonian Fluid ◽  
Couple Stress ◽  
Flow Resistance ◽  
Fluid Model ◽  
Arterial Stenosis ◽  
Couple Stress Fluid ◽  
Flow Through ◽  
Wall Shear

In this paper, a magnetic and non-Newtonian fluid model for pulsatile flow of blood with periodic body acceleration has been investigated by adopting Laplace transform and finite Hankel transform. A closed form of analytic solution is obtained for physiologically important quantities such as velocity profile, flow rate, wall shear stress and flow resistance. Effects of different physical parameters reflecting couple stress parameter, Darcy number, Hartman number, tapering angle (divergent tapered tube or convergent tapered tube), shape stenosis parameter and amplitude of periodic acceleration on wall shear stress and flow resistance have been emphasized. For any value of taper angle ([Formula: see text]) and stenotic height ([Formula: see text]), it is pertinent to point out here that the wall shear stress is less in the case of flow through the asymmetric stenosed tube as compared to the case of flow through the symmetric stenosed tube when one is in the up-stream of flow region, but it is of opposite behavior as one moves in the down-stream of flow region. It is important to note that the flow resistance increases significantly and more nonlinearly with the increase in the axial distance in the case of flow through a converging tapered artery with stenosis as compared to that of the same flow through a stenosed artery. The size of trapping bolus becomes larger for the flow of couple stress fluid through a converging tapered arterial stenosis than that of the same flow through a stenosed artery. Another important result is that as compared to the case of Newtonian fluid, the couple stress fluid behaviour plays a key role in increasing the size of trapping bolus. This investigation puts forward important observations that the asymmetric nature of stenosis considered plays a predominant role in reducing the flow resistance in the case of diseased blood vessel and the flow resistance is higher for the case of couple stress fluid than that of Newtonian fluid. Finally, some applications of the present model have been briefly discussed.

Experimental investigation of the wall shear stress and the vortex dynamics in a circular impinging jet

2012 ◽  
Vol 52 (6) ◽  
pp. 1475-1489 ◽  
Author(s):  
Mouhammad El Hassan ◽  
Hassan Hassan Assoum ◽  
Vaclav Sobolik ◽  
Jérôme Vétel ◽  
Kamel Abed-Meraim ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Shear Stress ◽  
Wall Shear Stress ◽  
Vortex Dynamics ◽  
Impinging Jet ◽  
Wall Shear
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