Abstract
A parametric numerical investigation has been performed of three-dimensional combined thermal–solutal capillary and buoyancy convection performances of micropolar multi-walled carbon nanotubes-water nanofluid. The governing equations are given based on vorticity-vector potential formulation and numerically resolved with finite volume method. The effects of Rayleigh number (104 \(\le\) Ra \(\le\) 106), micropolar parameter (0 \(\le\) K \(\le\) 5), buoyancy ratio (− 2 \(\le\) N \(\le\) 0), Marangoni number (0 \(\le\) Ma \(\le\) 1000), and nanofluid concentration (0.0055% \(\le \varphi \le\) 0.557%) on Sherwood/averaged Nusselt number are examined along with their impact on the streamlines, isotherms, and isoconcentrations. The results imply the significant impact of surface tension on the heat/mass transfer rate, in low Rayleigh number in particular Besides, the averaged Nusselt and Sherwood numbers are improved significantly due to arise in the Marangoni number originated from unidirectional effects of surface tension and buoyancy for the thermal-dominated regime. Within solutal-buoyancy governed zone, however, an opposite trend is evidenced. Heat/mass transfer rate is overestimated when the micropolar theory is not taken into consideration. Also, the performance of multi-walled carbon nanotubes/water nanofluid depends on the nanoparticles volume concentration. Hence, there is a critical nanofluid concentration beyond which the intensity of flow increases and then declines.
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Abbreviations
- C :
-
Dimensionless species concentration, \(C = \frac{{C^{\prime \prime } - C_{{\text{l}}}^{\prime } }}{{C_{{\text{H}}}^{\prime } - C_{{\text{L}}}^{\prime } }}\).
- Cʹ:
-
Species concentration (kg m−3)
- Cp:
-
Specific heat at constant pressure (kJ kg−1 K−1)
- D :
-
Species diffusivity (m2 s−1)
- g :
-
Acceleration of gravity (m s−2)
- \(\mathop{H}\limits^{\rightharpoonup}\) :
-
Dimensionless microrotation vector
- \(\vec{H}^{\prime}\) :
-
The microrotation vector (m s−1)
- K :
-
Micropolar parameter, \(K = \frac{k}{{\mu_{{\text{f}}} }}\)
- K:
-
Vortex viscosity (kg m−1 s−1)
- \(k\) :
-
Thermal conductivity (W m−1 K−1)
- L :
-
Enclosure height (m)
- Le:
-
Lewis number, \({\text{Le}} = \frac{\alpha }{D}\)
- Ma:
-
Marangoni number
- N :
-
Buoyancy ratio, \(N = \frac{{\beta_{{{\text{Cf}}}} \left( { C_{{\text{H}}} - C_{{\text{L}}} } \right)}}{{\beta_{{{\text{Tf}}}} \left( { T_{{\text{H}}} - T_{{\text{C}}} } \right)}}\)
- Nu:
-
Local Nusselt Number
- \(\overline{{{\text{Nu}}}}\) :
-
Average Nusselt Number
- Pr:
-
Prandtl number, \({\text{Pr}} = \frac{{\nu_{{\text{f}}} }}{{\alpha_{{\text{f}}} }}\),
- Ra:
-
Thermal Rayleigh number, \({\text{Ra}} = \frac{{g\beta_{{{\text{Tf}}}} \left( { T_{{\text{H}}} - T_{{\text{C}}} } \right)L^{3} }}{{\nu_{{\text{f}}} \alpha_{{\text{f}}} }}\)
- Sh:
-
Local Sherwood number
- \(\overline{{{\text{Sh}}}}\) :
-
Average Sherwood number
- t :
-
Dimensionless time, \(t = \frac{{\alpha t^{\prime } }}{{L^{2} }}\)
- T :
-
Dimensionless temperature, \(T = \frac{{T^{\prime } - T_{{\text{C}}}^{\prime } }}{{T_{{\text{H}}}^{\prime } - T_{{\text{C}}}^{\prime } }}\)
- Tʹ:
-
Temperature (K)
- \(\vec{U}\) :
-
Dimensionless velocity \(\vec{U} = \frac{{\overrightarrow {{U^{\prime } }} L}}{{\alpha_{{\text{f}}} }}\)
- \(\vec{U}^{\prime }\) :
-
Velocity (m s−1)
- x, y, z :
-
Dimensionless Cartesian coordinates, x = xʹ/L, y = yʹ/L, z = zʹ/L
- \(\alpha\) :
-
Thermal diffusivity (m2 s−1)
- β C :
-
Coefficient of compositional expansion (m3 kg−1)
- β T :
-
Coefficient of thermal expansion (K−1)
- φ :
-
Solid volume fraction
- μ :
-
Dynamic viscosity (kg m−1 s−1)
- ν :
-
Kinematic viscosity (m2s−1)
- ρ :
-
Density (kg m−3)
- \(\vec{\omega }\) :
-
Dimensionless vorticity, \(\vec{\omega } = \frac{{\overrightarrow {{\omega^{\prime } }} L}}{{\alpha_{{\text{f}}} }}\)
- \(\vec{\omega }^{^{\prime}}\) :
-
Vorticity (s−1)
- \(\vec{\psi }\) :
-
Dimensionless vector potential of velocity,\(\vec{\psi } = \frac{{\overrightarrow {{\psi^{\prime } }} }}{{\alpha_{{\text{f}}} }}\)
- \(\vec{\psi }^{^{\prime}}\) :
-
Vector potential of velocity (m2 s−1)
- C :
-
Cold
- F:
-
Fluid
- H:
-
Hot
- L:
-
Low
- max:
-
Maximum
- nf:
-
Nanofluid
- P:
-
Particle
- 1:
-
X-component
- 2:
-
Y-component
- 3:
-
Z-component
- ‘ :
-
Dimensional variables
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Acknowledgements
The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University for funding this work through the Large Groups Project under grant number (R.G.P.2/55/43)
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A.A., N.M. M.D. and M.N.B. contributed to the conception and design of the study. A.A., N.M., and P.E. acquired the data. AA., N.M., and M.D. analyzed or interpreted the data. A.A., N.M., and M.D. drafted the manuscript. P.E. and M.N.B. revised the manuscript critically for important intellectual content.All authors have read and agreed to the published version of the manuscript
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Abidi, A., Manaa, N., Mohamed, D. et al. Three-dimensional analysis of combined thermal–solutal buoyancy and capillary convection of water-based micropolar multi-walled carbon nanotubes nanofluids. J Therm Anal Calorim 147, 12391–12408 (2022). https://doi.org/10.1007/s10973-022-11434-0
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DOI: https://doi.org/10.1007/s10973-022-11434-0