INHERENT IRREVERSIBILITY IN CU-H2O NANOFLUID COUETTE FLOW WITH VARIABLE VISCOSITY AND NONLINEAR RADIATIVE HEAT TRANSFER

2019 ◽  
Vol 46 (6) ◽  
pp. 525-543 ◽  
Author(s):  
R. L. Monaledi ◽  
Oluwole Daniel Makinde
Keyword(s):  
Heat Transfer ◽  
Couette Flow ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Variable Viscosity

Magneto-Hemodynamics Mixed Convection with Radiative Heat Transfer in a Stenosed Artery

2017 ◽  
Vol 378 ◽  
pp. 68-84 ◽  
Author(s):  
Korande Fonso Ngufor ◽  
Oluwole Daniel Makinde
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Mixed Convection ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Variable Viscosity ◽  
Perturbation Technique ◽  
Fluid Velocity ◽  
Stenosed Artery ◽  
Percentage Volume

The hemodynamics mixed convection in a stenosed artery with radiative heat transfer in the presence of magnetic field is investigated. Blood is regarded as a viscous, incompressible, Newtonian, electrically conducting and optically dense bio-magnetic fluid. The variable viscosity of blood depending on hematocrit (percentage volume of erythrocytes) is taken into account in order to improve resemblance to the real situation. The constriction in the artery due to stenosis is assumed to be symmetrical such that the stenotic height is small compared with the half width of the unconstricted channel. The governing equations of momentum and energy balance are obtained and solved both numerically using a shooting technique coupled with Runge-Kutta-Fehlberg integration method and analytically using a well known perturbation technique. The effects of various controlling parameters on the dimensionless velocity, temperature, pressure gradient, skin friction and Nusselt number are presented graphically and discussed. It is observed that the flow rate at the stenotic region is enhanced by buoyancy force. The fluid velocity decreases while the temperature increases with an in magnetic field intensity. Our results could be useful in improving the design of flow meters in bio-medical instrumentation for detecting cardiovascular pathological conditions such as stenosis.

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