Abstract
In this paper, an innovative work has been explored on mixed convective hybrid nanofluid flow in the presence of a moving cone with surface roughness. The primary aim of this analysis is to establish the significance of hybrid nanofluid characteristics influencing the wall gradients such as skin friction coefficient and the rate of heat transfer. The hybrid nanofluid comprises water as the base fluid with silver (Ag) nanoparticles and magnesium oxide (MgO) nanoparticles added to it. The flow and heat transfer characteristics governing equations are expressed in terms of nonlinear coupled partial differential equations. The solutions of these equations are attempted numerically by employing the Quasilinearization technique in combination with the implicit finite difference approximation. It is noted that the rate of energy transfer and surface friction are higher for hybrid nanofluid (\(\varphi_{1} = 0.025\), \(\varphi_{2} = 0.025\)) than that for the pure MgO nanofluid (\(\varphi_{1} = 0\), \(\varphi_{2} = 0.05\)) and pure Ag nanofluid (\(\varphi_{1} = 0.05\), \(\varphi_{2} = 0\)), wherein the net volume fraction of 5% of nanoparticles is maintained. For hybrid nanofluid, the Nusselt number rises by 12% and 6% approximately in comparison with that for the pure Ag nanofluid and pure MgO nanofluid, respectively. This result can be attributed to the strong molecular interaction between the hybrid nanoparticles suspended in the water medium. In order to confirm the authentication of the accuracy of the results of the present analysis, the fluid friction and rate of energy transfer are compared with the previous research findings. It is revealed that the present results are in good agreement with those published outcomes.
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Abbreviations
- \(C_{{\text{f}}}\) :
-
Skin-friction coefficient
- \(\left( {C_{{\text{p}}} } \right)_{{\text{f}}} ,\,\left( {C_{{\text{p}}} } \right)_{{{\text{hnf}}}}\) :
-
Specific heat of the fluid and hybrid nanofluid
- Ec :
-
Eckert number
- \(f\) :
-
Non-dimensional stream function
- \(F = f_{{\upeta }}\) :
-
Non-dimensional velocity
- \(g\) :
-
Acceleration due to gravity
- \(G\) :
-
Non-dimensional temperature
- k f :
-
Thermal conductivity of the fluid
- \(k_{{{\text{hnf}}}}\) :
-
Thermal conductivity of the hybrid nanofluid
- m :
-
Exponent in the power law variation of the mainstream velocity
- \(n\) :
-
Frequency parameter
- Nu :
-
Nusselt number
- \(Pr\) :
-
Prandtl number
- Re :
-
Reynolds number
- \(Ri\) :
-
Richardson number
- \(t\) :
-
Time
- \(T\) :
-
Temperature of the fluid
- \(T_{{\text{w}}}\) :
-
Wall temperature
- \(T_{\infty }\) :
-
Ambient fluid temperature
- \(u,\,v\) :
-
Components of velocity along x and y coordinates, respectively
- \(U_{{\text{w}}}\) :
-
Velocity of the cone surface
- \(U_{\text{e}}\) :
-
Mainstream velocity
- \(U_{\infty }\) :
-
Mainstream velocity constant
- \(x,\,y\) :
-
Cartesian coordinates
- α :
-
Unsteady parameter
- β :
-
Thermal expansion coefficient
- γ :
-
Roughness parameter
- ε :
-
Velocity ratio parameter
- θ :
-
Half angle of the vertical cone
- \(\mu _{{\text{f}}} ,\;\mu _{{{\text{hnf}}}}\) :
-
Dynamic viscosity of the fluid and hybrid nanofluid
- \(\nu_{{\text{f}}} ,\;\nu_{{{\text{nf}}}}\) :
-
Kinematic viscosity of the water and Ag/H2O nanofluid
- \(\nu_{{hnf}}\) :
-
Kinematic viscosity of the hybrid nanofluid
- \(\xi ,\;\eta\) :
-
Transformed variables
- \(\rho _{{\text{f}}} ,\;\rho _{{{\text{nf}}}}\) :
-
Viscosity of the water and Ag/H2O nanofluid
- \(\rho _{{{\text{hnf}}}}\) :
-
Viscosity of the hybrid nanofluid
- \(\phi (\tau )\) :
-
Unsteady function of τ
- \(\phi _{1} ,\;\phi _{2}\) :
-
Solid volume fractions of Ag and MgO nanoparticles, respectively
- ψ :
-
Stream function
- \(\xi ,\;\eta\) :
-
Partial derivatives with respect to ξ, η
- \(w,\,\,\infty\) :
-
Constraints at the surface and away from the surface, respectively
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Acknowledgements
The second author is thankful for the financial support to the Department of Science and Technology-Innovation in Science Pursuit for Inspired Research (DST-INSPIRE).
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Appendix
Appendix
The Table
2 presents the formulae of different properties of nanofluids and hybrid nanofluids, while the Table
3 represents the thermophysical properties of water and nano additives.
Comparison with earlier results in the literature
In order to confirm the authentication of the accuracy of the results of the present analysis, the present results of gradients are compared with the previous research findings of Himasekhar et al. [39] and Chamkha and Al-Mudhaf [40] in the Table
4, which shows that the current findings are in good agreement with the results obtained in [39] and [40].
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Patil, P.M., Goudar, B. Time-dependent mixed convection flow of Ag–MgO/water hybrid nanofluid over a moving vertical cone with rough surface. J Therm Anal Calorim 147, 10693–10705 (2022). https://doi.org/10.1007/s10973-022-11246-2
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DOI: https://doi.org/10.1007/s10973-022-11246-2