Abstract
This work examines the entropy generation with heat and mass transfer in magnetohydrodynamic (MHD) stagnation point flow across a stretchable surface. The heat transport process is investigated with respect to the viscous dissipation and thermal radiation, whereas the mass transport is observed under the influence of a chemical reaction. The irreversibe factor is measured through the application of the second law of thermodynamics. The established non-linear partial differential equations (PDEs) have been replaced by acceptable ordinary differential equations (ODEs), which are solved numerically via the bvp4c method (built-in package in MATLAB). The numerical analysis of the resulting ODEs is carried out on the different flow parameters, and their effects on the rate of heat transport, friction drag, concentration, and the entropy generation are considered. It is determined that the concentration estimation and the Sherwood number reduce and enhance for higher values of the chemical reaction parameter and the Schmidt number, although the rate of heat transport is increased for the Eckert number and heat generation/absorption parameter, respectively. The entropy generation augments with boosting values of the Brinkman number, and decays with escalating values of both the radiation parameter and the Weissenberg number.
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Abbreviations
- u, v :
-
fluid velocity components
- M :
-
Hartmann number
- τ :
-
capacity ratio
- θ :
-
dimensionless temperature
- ρ :
-
density
- γ :
-
chemical reaction parameter
- σ :
-
electrical conductivity
- q m :
-
wall mass flux
- ν :
-
kinematic viscosity
- D :
-
coefficient of diffusion
- η :
-
similarity variable
- δ :
-
heat generation/absorption
- B 0 :
-
strength of magnetic field
- T w :
-
surface temperature
- a, c :
-
constants
- Ec :
-
Eckert number
- T :
-
temperature
- n :
-
power law index
- C :
-
concentration
- ϕ :
-
nanoparticle volume fraction
- C p :
-
specific heat
- C w :
-
surface concentration
- T ∞ :
-
ambient temperature
- u w :
-
stretching velocity
- C ∞ :
-
ambient concentration
- u e :
-
free stream velocity
- K 1 :
-
chemical reaction parameter
- μ :
-
dynamic viscosity
- q w :
-
wall heat flux
- k :
-
thermal conductivity
- τ w :
-
shear stress
- S :
-
suction parameter
- Le :
-
Lewis number
- A :
-
ratio parameter
- f :
-
dimensionless stream function
- Sc :
-
Schmidt number
- C fx :
-
skin friction coefficient
- R :
-
radiation parameter
- \(N{u_x}\) :
-
Nusselt number
- N G :
-
entropy generation
- Sh x :
-
local Sherwood number
- B r :
-
Brinkman number
- We :
-
Weissenberg number
- L :
-
diffusion parameter
- Re x :
-
Reynolds number
- α 1 :
-
temperature difference variable
- Pr :
-
Prandtl number
- α 2 :
-
concentration difference parameter.
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Citation: ZHAO, T. H., KHAN, M. R., CHU, Y. M., ISSAKHOV, A., ALI, R., and KHAN, S. Entropy generation approach with heat and mass transfer in magnetohydrodynamic stagnation point flow of a tangent hyperbolic nanofluid. Applied Mathematics and Mechanics (English Edition), 42(8), 1205–1218 (2021) https://doi.org/10.1007/s10483-021-2759-5
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Zhao, T., Khan, M.R., Chu, Y. et al. Entropy generation approach with heat and mass transfer in magnetohydrodynamic stagnation point flow of a tangent hyperbolic nanofluid. Appl. Math. Mech.-Engl. Ed. 42, 1205–1218 (2021). https://doi.org/10.1007/s10483-021-2759-5
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DOI: https://doi.org/10.1007/s10483-021-2759-5
Key words
- tangent hyperbolic fluid
- magnetohydrodynamic (MHD)
- viscous dissipation
- stagnation point flow
- heat generation/absorption
- thermal radiation