Startseite Numerical Study of MHD Viscoelastic Fluid Flow with Binary Chemical Reaction and Arrhenius Activation Energy
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Numerical Study of MHD Viscoelastic Fluid Flow with Binary Chemical Reaction and Arrhenius Activation Energy

  • M. Mustafa EMAIL logo , A. Mushtaq , T. Hayat und A. Alsaedi
Veröffentlicht/Copyright: 6. Oktober 2016
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Abstract

Here we address the influence of heat/mass transfer on MHD axisymmetric viscoelastic fluid flow developed by an elastic sheet stretching linearly in the radial direction. Constitutive relations of Maxwell fluid model are utilized in mathematical formulation of the problem. Non-linear radiation heat flux is factored in the model which accounts for both small and large temperature differences. Chemical reaction effects with modified Arrhenius energy function are analyzed which are not yet explored for viscoelastic fluid flows. Highly accurate numerical computations are performed. Our computations show S-shaped profiles of temperature function in case of sufficiently large temperature differences. Species concentration increases when activation energy for chemical reaction is increased. However, both chemical reaction rate and temperature gradient tend to reduce the solute concentration.

Nomenclature

(r,θ,z)

Cylindrical coordinate system

u,w

radial and axial velocity components

B0

magnetic field strength

uw

velocity of the stretching sheet

f

dimensionless radial component of velocity

M

Hartman number

C

concentration

Cw

wall concentration

C

ambient concentration

T

fluid temperature

Tw

wall temperature

T

ambient fluid temperature

Q

heat source/sink parameter

Cp

specific heat

Pr

Prandtl number

qw,qr

wall and Rosseland radiative heat flux respectively

Nu

local Nusselt number

k

mean absorption coefficient

Re

Reynolds number

E

non-dimensional activation energy

D

solutal diffusivity

De

Deborah number

Sc

Schmidt number

Rd

radiation parameter

Greek symbols
η

similarity variable

ϕ

dimensionless nanoparticle concentration

σ

dimensionless chemical reaction rate constant

λ1

fluid relaxation time

ρ

density

μ

dynamic viscosity

ν

kinematic viscosity

α

thermal diffusivity

σ

Stefan-Boltzman constant

θ

dimensionless temperature

1st order derivative with respect to η

''

2nd order derivative with respect to η

'''

3rd order derivative with respect to η

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Published Online: 2016-10-6
Published in Print: 2017-1-1

©2017 by De Gruyter

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