Abstract
Casson fluid possesses yield stress and has great importance in biomechanics and polymer processing industries. In the present study, a mathematical model is presented to Cattaneo–Christov-based study on the heat and mass transfer, as well as entropy generation analysis of a thermal system in the presence of the Casson hybrid nanofluid over lubricated surfaces at a stagnation point. A power-law (shear-thinning) fluid is utilized for lubrication. Implementing the continuity of velocity and shear stress of Casson and power-law fluids creates interfacial conditions. We also incorporated thermal radiation effects and a uniform transverse magnetic field in the present study. The similarity techniques are used to reduce the governing nonlinear partial differential equation to a set of the ordinary differential equation. For the numerical solution of the considered problem, we have used MATLAB-based Bvp4c method. The results are presented for hybrid alumina-copper/ethylene glycol (Al2O3–Cu/EG) nanofluid. The computed results are original, and it has been noticed that the present results have excellent agreement with the results of the previous extending literature. It has been observed that the Nusselt number or heat transfer rate of hybrid nanofluid flow is better as compared to nanofluid flow.
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Abbreviations
- β:
-
The Casson parameter
- βC :
-
Volumetric expansion’s coefficients due to concentration
- βT :
-
Volumetric expansion’s coefficients due to temperature
- λ:
-
Thermal relaxation time period
- b :
-
Temperature/concentration length dimension
- T m :
-
The mean fluid temperature s
- K T :
-
The thermal diffusion ratio
- K r1 :
-
The chemical reaction parameter
- λ1 :
-
The thermal buoyancy parameter and
- λ2 :
-
The concentration buoyancy parameter
- Ns :
-
Entropy production
- \(\hat{U}_{e}\) :
-
Non-uniform velocity fluids temperatures
- \(\hat{C}\) :
-
Fluid concentration
- \(\hat{T}_{b}\) :
-
The surface temperature
- \(\hat{C}_{b}\) :
-
The surface concentration
- k s1 :
-
Thermals conductivity of first particle
- k s2 :
-
Thermals conductivity of second particle
- k f :
-
Thermals conductivity of base fluids
- k nf :
-
Thermals conductivity of the nanofluid
- k h nf :
-
Thermals conductivity of the hybrid nanofluids
- S :
-
Depends on the shape factor through the H–C models
- ρs1 :
-
Density of the first nanoparticles
- ρs1 :
-
Density of the second nanoparticles
- (c p)hnf :
-
Specifics heats for the hybrid nanofluid
- P y :
-
Fluid’s yield stress
- πc :
-
Critical product
- D m :
-
Species diffusivity
- σ*:
-
Stefan Boltzmann constant
- k*:
-
Consistency coefficients
- γ:
-
Thermal relaxation time period
- M:
-
The magnetic parameter
- μL :
-
The lubricant viscosity
- ′Ω:
-
The dimensionless temperature gradient
- S c :
-
Schmidt number
- B r :
-
The Brinkman number
- S r :
-
Soret number
- K r :
-
The chemical reaction parameter
- R e :
-
The permeability Reynolds numbers
- P r :
-
The Prandtl number
- R :
-
Thermal radiation parameter
- μhnf :
-
The dynamic viscosity of the hybrid nanofluid
- ρhnf :
-
The density of the hybrid nanofluids
- σhnf :
-
Electrical conductivity of hybrid nanofluid
- υhnf :
-
The kinametic viscosity of hybrid nanofluid
- HNF:
-
Hybrid nanofluid
- SP:
-
Stagnation point
- MC:
-
Mixed convection
- SFC:
-
Skin friction coefficients
- c p :
-
Specifics heats at constant pressure
- η:
-
Scaled boundary layer coordinate
- θ:
-
Self-similar temperature
- μ:
-
Dynamic viscosity
- υ:
-
Kinematic viscosity
- ρ:
-
Density
- σ:
-
Electric conductivity
- ϕ 1 :
-
First nanoparticle volume fraction
- ϕ 2 :
-
Second nanoparticle volume fraction
- nf:
-
Nanofluid
- hnf:
-
Hybrid nanofluid
- s1:
-
First nanoparticles
- s2:
-
Second nanoparticles
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Rauf, A., Faisal & Mushtaq, T. Cattaneo–Christov-based study of AL2O3–Cu/EG Casson hybrid nanofluid flow past a lubricated surface with cross diffusion and thermal radiation. Appl Nanosci 12, 2059–2076 (2022). https://doi.org/10.1007/s13204-022-02495-6
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DOI: https://doi.org/10.1007/s13204-022-02495-6