Abstract
This paper describes the MHD stagnation-point flow of Cu-Al2O3/H2O hybrid nanofluid toward a convectively heated shrinking disk with convective boundary condition, suction, Joule heating and viscous dissipation effects. Similarity transformation reduces the PDEs into a system of ODEs, which then numerically solved using the bvp4c solver. The comparison between present and previous results in certain cases shows an excellent agreement with approximately 0% relative error. Two solutions exist in which the second solution appears near to the separation value of the velocity ratio parameter. The stability analysis shows that the first solution is physically stable (realizable in practice). An increase of suction and magnetic parameters extends the critical value and aids the performance of heat transfer operation. Further, the heat transfer rate boosts while the critical values unchanged with the rise of Eckert number (implies the operating Joule heating and viscous dissipation) and Biot number (implies the operating convective boundary condition). The temperature profile reduces with the increment of velocity ratio parameter, Eckert and Biot numbers while the velocity increases with the addition of velocity ratio and magnetic parameters. This study is important in the estimation of the flow and thermal behavior for Cu-Al2O3/H2O when the physical parameters are embedded.
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- \(a,b\) :
-
constant
- \(B_{0}\) :
-
Strength of the magnetic field (constant)
- \({\rm{Bi}}\) :
-
Biot number
- \(C_{f}\) :
-
Skin friction coefficient along the r-direction
- \(C_{p}\) :
-
Specific heat at constant pressure (\({\text{Jkg}}^{{ - 1}} {\text{K}}^{{ - 1}}\))
- \({\rm{Ec}}\) :
-
Eckert number
- \(f\left( \eta \right)\) :
-
Dimensionless stream function
- \(k\) :
-
Thermal conductivity of the fluid (\({\text{Wm}}^{{ - 1}} {\text{K}}^{{ - 1}}\))
- \(M\) :
-
Magnetic parameter
- \({\rm{Nu}}_{r}\) :
-
Local Nusselt number
- \(\Pr\) :
-
Prandtl number
- \(\text{Re} _{r}\) :
-
Local Reynolds number
- \(S\) :
-
Suction/injection parameter
- \(T\) :
-
Fluid temperature (\({\text{K}}\))
- \(T_{f}\) :
-
Temperature of the hot fluid (\({\text{K}}\))
- \(T_{\infty }\) :
-
Ambient temperature (\({\text{K}}\))
- \(u\) \(u,v\) :
-
velocity component in the r- and z-directions (\({\text{ms}}^{{ - 1}}\) )
- \(u_{w}\) :
-
Velocity of the stretching/shrinking disk (\({\text{ms}}^{{ - 1}}\))
- \(u_{e}\) :
-
Free stream velocity (\(\text{ms}^ {- 1}\))
- \(w_{w}\) :
-
Mass velocity for the permeable disk (\({\text{ms}}^{{ - 1}}\))
- \(\eta\) :
-
Similarity variable
- \(\tau\) :
-
Dimensionless time variable
- \(\theta\) :
-
Dimensionless temperature
- \(\lambda\) :
-
Velocity ratio parameter
- \(\mu\) :
-
Dynamic viscosity of the fluid (\({\text{kgm}}^{{ - 1}} {\text{s}}^{{ - 1}}\))
- \(\nu\) :
-
Kinematic viscosity of the fluid (\({\text{m}}^{2} {\text{s}}^{{ - 1}}\))
- \(\rho\) :
-
Fluid density (\({\text{kg\,m}}^{{ - 3}}\))
- \(\phi _{1}\) :
-
Alumina concentration
- \(\phi _{2}\) :
-
Copper concentration
- \(f\) :
-
Base fluid
- \(nf\) :
-
Nanofluid
- \(hnf\) :
-
Hybrid nanofluid
- \(s1\) :
-
Alumina’s solid component
- \(s2\) :
-
Copper’s solid component
- \(\prime\) :
-
Differentiation with respect to \(\eta\)
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Acknowledgements
We acknowledge the Ministry of Higher Education (MOHE) Malaysia and Universiti Teknikal Malaysia Melaka for the FRGS Scheme FRGS/1/2021/STG06/UTEM/03/1. We also appreciate the research support from Universiti Putra Malaysia and Babes-Bolyai University.
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Khashi’ie, N.S., Wahid, N.S., Md Arifin, N. et al. MHD stagnation-point flow of hybrid nanofluid with convective heated shrinking disk, viscous dissipation and Joule heating effects. Neural Comput & Applic 34, 17601–17613 (2022). https://doi.org/10.1007/s00521-022-07371-6
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DOI: https://doi.org/10.1007/s00521-022-07371-6