Abstract
The study is concerned with entropy minimization on three-dimensional magnetohydrodynamic Oldroyd-B fluid flow with relaxation–retardation viscous dissipation and a mixed chemical reaction. A numerical solution of the nonlinear transport equations is obtained using an overlapping grid spectral collocation numerical scheme. We investigate strategies for entropy generation minimization in terms of system parameters such as the mixed convection parameter and changes in thermal and concentration fields under different conditions. Further, the findings on changes in the axial and transverse skin friction coefficients, the Nusselt number and the Sherwood number are presented.
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Abbreviations
- (u, v, w):
-
Velocity components along (x, y, z) directions
- \(B_0\) :
-
Uniform magnetic field strength
- \(\lambda _1\) :
-
Relaxation time
- \(\lambda _2\) :
-
Retardation time
- \(\nu _f\) :
-
Kinematic viscosity
- \(\varGamma _e\) :
-
Relaxation time for heat flux
- \(\varGamma _c\) :
-
Relaxation time for mass flux
- T :
-
Fluid temperature in the boundary layer
- \(T_\infty \) :
-
Temperature of ambient fluid
- \(T_w\) :
-
Surface temperature
- C :
-
Fluid concentration in the boundary layer
- \(C_\infty \) :
-
Concentration of ambient fluid
- \(C_w\) :
-
Surface concentration
- g :
-
Acceleration due to gravity
- \(k_f\) :
-
Thermal conductivity
- \(\rho _\mathrm{f}\) :
-
Density of the fluid
- q :
-
Heat flux
- V :
-
Velocity
- \(\varGamma _1\) :
-
Deborah number in terms of relaxation time
- \(\varGamma _2\) :
-
Deborah number in terms of retardation time
- Sc:
-
Schmidt number
- M:
-
Hartman number
- \(\hbox {Gr}_x\) :
-
Thermal Grashof number
- Re:
-
Reynolds number
- Pr:
-
Prandtl number
- J :
-
Mass flux
- \(\varepsilon \) :
-
Thermal relaxation chemical reaction parameter
- \(\phi \) :
-
Irreversibility ratio
- \(D_\mathrm{B}\) :
-
Brownian diffusion coefficient
- \(\gamma \) :
-
Chemical reaction parameter
- \(\beta \) :
-
Ratio of stretching rates
- \(\lambda \) :
-
Mixed convection parameter
- N :
-
Concentration buoyancy parameter
- \(\delta _\mathrm{e}\) :
-
Deborah number in terms of relaxation time of the heat flux
- \(\delta _\mathrm{c}\) :
-
Deborah number in terms of relaxation time of the mass flux
- \(\beta _\mathrm{T}\) :
-
Volumetric coefficient thermal expansion
- \(\beta _\mathrm{T}\) :
-
Volumetric coefficient solutal expansion
- EG:
-
Entropy generation
- VBL:
-
Velocity boundary layer
- HTR:
-
Heat transfer rate
- TBL:
-
Thermal boundary layer
- CPU:
-
Central processing unit
- QLM:
-
Quasi-linearization method
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Acknowledgements
The authors are grateful to the University of KwaZulu-Natal, South Africa, and Amity University Kolkata, India, for necessary support.
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Mburu, Z.M., Nayak, M.K., Mondal, S. et al. Impact of irreversibility ratio and entropy generation on three-dimensional Oldroyd-B fluid flow with relaxation–retardation viscous dissipation. Indian J Phys 96, 151–167 (2022). https://doi.org/10.1007/s12648-020-01950-w
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DOI: https://doi.org/10.1007/s12648-020-01950-w