Abstract
The present paper deals with the flow of Cross rheological fluid along a stationary rigid plate caused by stream-wise pressure gradient. Flow field is affected by uniform magnetic field acting normal to the plate axis. Interaction of flow field with chemically reacting solute is modeled through the advection–diffusion equation in which temperature dependency of the reaction rate on activation energy is considered. Energy equation containing source term and variable thermal conductivity is treated. Locally similar solutions are obtained and interpreted for a certain range of embedded parameters. Shear-thinning aspect of Cross fluid is apparent from the computational results. A monotonic decay in vertical velocity is noticed for increasing values of flow behavior index (n) which, in turn, leads to pronounced heat conduction. An important finding is that activation energy of chemical reaction remarkably alters the solute concentration near the plate.
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Abbreviations
- \(\left( x,y \right) \) :
-
Cartesian coordinate system
- u, v :
-
Velocity components along x- and y-directions, respectively
- K :
-
Consistency index
- f :
-
Dimensionless stream function
- \(B_{0}\) :
-
Magnetic flux density
- a :
-
Positive constant
- M :
-
Magnetic interaction parameter
- \(c_{p}\) :
-
Specific heat
- k(T):
-
Variable thermal conductivity
- n :
-
Flow behavior index
- \(E_{a}\) :
-
Activation energy
- m :
-
Fitted rate constant
- s :
-
Heat source/sink
- E :
-
Dimensionless activation energy
- Pr :
-
Prandtl number
- \(Re_{x}\) :
-
Local Reynolds number
- We :
-
Local Weissenberg number
- Sc :
-
Schmidt number
- T :
-
Fluid temperature
- C :
-
Solute concentration
- \(C_{f}\) :
-
Skin friction coefficient
- \(Nu_{x}\) :
-
Local Nusselt number
- \(Sh_{x}\) :
-
Local Sherwood number
- \(\tau _{w}\) :
-
Shear stress at the plate
- \(q_{w}\) :
-
Wall heat flux
- \(j_{w}\) :
-
Wall mass flux
- \(u_{e}(x)\) :
-
Velocity of the outer flow
- \(\dot{\gamma }\) :
-
Shear rate
- \(\eta \) :
-
Similarity variable
- \(\theta \) :
-
Dimensionless temperature
- \(\phi \) :
-
Dimensionless concentration
- \(\eta _{0}\) :
-
Viscosity at zero shear rate
- \(\eta _{\infty }\) :
-
Infinite shear rate viscosity
- \(\delta \) :
-
Temperature difference parameter
- \(\sigma _{1}\) :
-
Fluid electrical conductivity
- \(\epsilon \) :
-
Dimensionless constant
- \(\rho \) :
-
Fluid density
- \(\kappa \) :
-
Boltzmann constant
- \(\sigma \) :
-
Dimensionless reaction parameter
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Mustafa, M., Sultan, A. & Rahi, M. Pressure-Driven Flow of Cross Fluid Along a Stationary Plate Subject to Binary Chemical Reaction and Arrhenius Activation Energy. Arab J Sci Eng 44, 5647–5655 (2019). https://doi.org/10.1007/s13369-018-3678-0
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DOI: https://doi.org/10.1007/s13369-018-3678-0