Abstract
This article presents the nonlinear, steady boundary layer flow and heat transfer of an incompressible Tangent Hyperbolic non-Newtonian fluid from a Horizontal Circular Cylinder in the presence of magnetic field and Biot number effects. The transformed conservation equations are solved numerically subject to physically appropriate boundary conditions using a second-order accurate implicit finite-difference Keller Box technique. The numerical code is validated with previous studies. The influence of a number of emerging non-dimensional parameters, namely the Weissenberg number (We), power law index (n), Prandtl number (Pr), Biot number \((\upgamma )\), the magnetic parameter (M) and dimensionless tangential coordinate (\(\xi \)) on velocity and temperature evolution on the boundary layer regime are examined in detail. Furthermore, the effects of these parameters on surface heat transfer rate and local skin friction are also investigated. Validation with earlier Newtonian studies is presented and excellent correlation achieved. It is found that the velocity, skin friction and heat transfer rate reduce with increasing We. Whereas, there is slight increase in temperature. Increasing n is observed to increase the velocity and heat transfer rate but decreases temperature and skin friction. An increasing \(\upgamma \) is seen to increase velocity, temperature, local skin friction and heat transfer rate. And an increasing M is found to decrease velocity, skin friction and heat transfer rate but increases the temperature. The study is relevant to chemical materials processing applications.
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Abbreviations
- a:
-
radius of the cylinder
- \(B_{0 }\) :
-
externally imposed radial magnetic field
- \(C_{f}\) :
-
Skin friction coefficient
- f :
-
Non-dimensional steam function
- Gr :
-
Grashof number
- g :
-
Acceleration due to gravity
- k:
-
Thermal conductivity of fluid
- M :
-
Magnetic parameter
- n :
-
Power law index
- Nu :
-
Heat transfer rate (Local Nusselt number)
- Pr :
-
Prandtl number
- T :
-
Temperature of the fluid
- u, v :
-
Non-dimensional velocity components along the x and y directions, respectively
- V :
-
Velocity vector
- We :
-
Weissenberg number
- x :
-
Stream wise coordinate
- y :
-
Transverse coordinate
- \(\alpha \) :
-
Thermal diffusivity
- \(\beta \) :
-
The coefficient of thermal expansion
- \(\varPhi \) :
-
Azimuthal coordinate
- \(\phi \) :
-
Non-dimensional concentration
- \(\eta \) :
-
The dimensionless radial coordinate
- \(\mu \) :
-
Dynamic viscosity
- \(\nu \) :
-
Kinematic viscosity
- \(\theta \) :
-
Non-dimensional temperature
- \(\rho \) :
-
Density of non-Newtonian fluid
- \(\xi \) :
-
The dimensionless tangential coordinate
- \(\psi \) :
-
Dimensionless stream function
- \(\gamma \) :
-
Biot number
- \(\Gamma \) :
-
Time dependent material constant
- \(\Pi \) :
-
Second invariant strain tensor
- w :
-
Conditions at the wall (cylinder surface)
- \(\infty \) :
-
Free stream conditions
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Gaffar, S.A., Prasad, V.R. & Reddy, E.K. Magnetohydrodynamic Free Convection Flow and Heat Transfer of Non-Newtonian Tangent Hyperbolic Fluid from Horizontal Circular Cylinder with Biot Number Effects. Int. J. Appl. Comput. Math 3, 721–743 (2017). https://doi.org/10.1007/s40819-015-0130-y
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DOI: https://doi.org/10.1007/s40819-015-0130-y