Abstract
The main motive of this work is to study the effects of nonlinear radiation and mixed convection for the Casson nanofluid through the thin needle. Mass transfer is further characterized by activation energy. Temperature-dependent viscosity and a variable magnetic field are assumed for the current problem. The consequences of the physical framework on the velocity, temperature and species including the impact of radiative heat flux are discussed. The partial differential equations of the physical model are achieved using the concept of boundary layer approximation and are remolded into the ordinary differential mathematical statement which is coupled nonlinear, by substituting specific similarity transformations. By making the use of built-in MATLAB bvp4c function, the results are calculated and arranged in the manner of graphs and tables. The effects of different physical parameters of our interest such as the Casson fluid parameter, Brownian motion, Prandtl number, buoyancy ratio parameter, thermal radiation, thermophoresis parameter, Schmidt number and relaxation time are examined for the velocity, concentration and temperature profiles.
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Abbreviations
- \(B_{o}\) :
-
Uniform magnetic field strength (Tesla)
- \(\sigma \) :
-
Electric conductivity (Siemens/m)
- k :
-
Thermal conductivity [W/(mK)]
- \(k_{e}\) :
-
Mean adsorption coefficient
- \(D_{B}\) :
-
Effective diffusion coefficient (m\(^{2}\)/s)
- \(T_{w}\) :
-
Temperature of the wall (K)
- \(T_{\infty }\) :
-
Ambient temperature (K)
- C :
-
Concentration (mol/m\(^{3}\))
- \(C_{w}\) :
-
Wall concentration (mol/m\(^{3}\))
- \(C_{\infty }\) :
-
Ambient concentration (mol/m\(^{3}\))
- \(\nu \) :
-
Dynamic viscosity (Pa.s)
- P :
-
Pressure (Pa)
- v :
-
Kinematic viscosity (m\(^{2}\)/s)
- \(\rho \) :
-
Density (kg/m\(^{3}\))
- T :
-
Temperature (K)
- \(q_{r}\) :
-
Radiative heat flux (W/m\(^{2}\))
- Nt :
-
Thermophoresis parameter
- (u, v):
-
Components of the velocity (m/s)
- (x, y):
-
Cartesian co-ordinates (m)
- \(C_{f}\) :
-
Local skin friction
- \(\mathrm{Nu}_{x}\) :
-
Local Nusselt number
- \(\mathrm{Sh}_{x}\) :
-
Local Sherwood number
- Pr:
-
Prandtl number
- R :
-
Radiation parameter
- Re:
-
Reynolds number
- \(\alpha \) :
-
Thermal diffusivity (m\(^{2}\)/s)
- \(\beta \) :
-
Casson parameter
- \(\lambda \) :
-
Velocity ratio parameter
- Nr :
-
Buoyancy ratio parameter
- Nb :
-
Brownian motion parameter
- \(\sigma _{s}\) :
-
Stefan–Boltzmann constant (W/m\(^{2}\)K\(^{4}\))
- \(\xi \) :
-
Constant mixed convection
- \(\mathrm{Gr}_{x}\) :
-
Local Grashof number
- \(\mathrm{Re}_{x}\) :
-
Local Reynolds number
- Sc:
-
Schmidt number
- \(\Gamma \) :
-
Relaxation time
- \(\delta \) :
-
Temperature difference ratio
- E :
-
Activation energy
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MB proposed the problem, modeled it and finally reviewed. UY calculated the result and prepared the initial draft.
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Bilal, M., Urva, Y. Analysis of non-Newtonian fluid flow over fine rotating thin needle for variable viscosity and activation energy. Arch Appl Mech 91, 1079–1095 (2021). https://doi.org/10.1007/s00419-020-01811-2
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DOI: https://doi.org/10.1007/s00419-020-01811-2