Abstract
The statistical and exact analysis of heat transfer rate and skin friction coefficient of a nonlinear convective flow of Cu − Al2O3 − H2O hybrid nanofluid with polar particle suspension is performed. The heat transport phenomenon includes radiative heat effect. A micropolar fluid model is accounted. Exact solutions to the governing problem are found via Laplace transform method (LTM). The heat transfer rate and skin friction are analysed critically via statistical methods like probable error and regression models. The slope of linear regression of data points for skin friction and Nusselt number is estimated to quantify the increase/decrease. The Nusselt number and thermophysical properties for twenty-four different hybrid nanofluids are presented. A novel idea of a nonlinear convective flow of Cu − Al2O3 − H2O hybrid nanofluid with polar particle suspension is investigated for the first time. Opposite behaviour of velocity and microrotation profile are established when the physical parameters are varied.
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Abbreviations
- \( \overrightarrow{V} \) :
-
Fluid velocity vector (m/s)
- T :
-
Temperature (K)
- \( \overrightarrow{N} \) :
-
Microrotation vector
- c p :
-
Effective specific heat coefficient of fluid (J/kg K)
- g :
-
Acceleration due to gravity (m/s2)
- p :
-
Pressure (kg/m s2)
- K :
-
Thermal conductivity (W/m K)
- k ∗ :
-
Rosseland mean absorption coefficient
- b :
-
Body force
- t :
-
Time (s)
- j :
-
Micro-inertia density
- I :
-
Body couple per unit mass
- U :
-
Characteristic velocity
- Gr:
-
Thermal Grashof number
- R :
-
Thermal radiation parameter
- Pr:
-
Prandtl number
- a 1 − a 13, b 1, b 2 :
-
Symbols denoting the expressions involving constants.
- β T :
-
Thermal expansion coefficient
- α, λ :
-
Spin-gradient viscosity coefficient
- ν :
-
Kinematic viscosity (m2/s)
- μ :
-
Dynamic viscosity (kg/m s)
- ɸ :
-
Nanoparticle volume fraction
- ρ :
-
Density (kg/m3)
- σ ∗ :
-
Stefan-Boltzmann constant
- κ 1 :
-
Vortex viscosity
- η :
-
Spin-gradient viscosity
- κ :
-
Microrotation parameter
- γ :
-
Nonlinear convection parameter
- f :
-
Base fluid
- hnf:
-
Hybrid nanofluid
- Cu, Al2O3 :
-
Nanoparticles
- Z 1 − Z 6 :
-
Symbols denoting the definition of functions
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Acknowledgements
We express our sincere thanks to the Management, CHRIST (Deemed to be University), Banglore, India for their support to complete this work. Further, we would like to express our sincere gratitude to the Editors and anonymous Reviewers for their constructive suggestions to enhance the quality of the paper.
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Mackolil, J., Mahanthesh, B. Time-Dependent Nonlinear Convective Flow and Radiative Heat Transfer of Cu-Al2O3-H2O Hybrid Nanoliquid with Polar Particles Suspension: a Statistical and Exact Analysis. BioNanoSci. 9, 937–951 (2019). https://doi.org/10.1007/s12668-019-00667-3
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DOI: https://doi.org/10.1007/s12668-019-00667-3
Keywords
- Micropolar fluid; hybrid nanofluid
- Nonlinear convection
- Thermal radiation
- Laplace transform method
- Regression analysis
- Probable error