Abstract
In current study, a flow boiling experimental examination has been performed on water, water-TiO2 nanofluid, and water-Al2O3 nanofluid and Gradient Boost Regression model was established to predict the Nusselt number of TiO2 and Al2O3 nanofluids. Nusselt number was calculated by varying heat flux, Reynolds number, and volumetric concentration. Good agreement was shown by water results acquired from experiments with the correlation of Chen and CFD. Results demonstrated that the Nusselt number of TiO2 and Al2O3 nanofluid was larger than water. Increment in Nusselt number was noticed with the increment in concentration, heat flux, and Reynolds number. It was seen that Al2O3 nanofluid was superior to TiO2 nanofluid. Highest improvement in the Nusselt number was 37% shown by Al2O3 nanofluid when compared to water. Correlations of Nusselt number were developed for both nanofluids. GBR-GSO machine learning model showed a good agreement with the experimental Nusselt number.
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Abbreviations
- \({c}_{\rm l}\) :
-
Specific heat capacity of liquid, J Kg−1 K−1
- C:
-
Concentration
- \({D}_{\mathrm{h}}\) :
-
Hydraulic diameter of the tube, m
- F:
-
Two-phase multiplier
- h:
-
Heat transfer coefficient, Wm−2 K−1
- \({H}_{\mathrm{fg}}\) :
-
Enthalpy of vaporization, Jkg−1
- k:
-
Turbulent kinetic energy, m2s−2
- \({k}_{\mathrm{l}}\) :
-
Thermal conductivity of the liquid, Wm−1 K−1
- \(\dot{m}\) :
-
Mass flux, kgm−2 s−1
- m:
-
Nanoparticle mass, kg
- Nu:
-
Nusselt number
- Pr:
-
Prandtl number
- Q:
-
Heat, J
- q:
-
Heat flux, Wm−2
- R2 :
-
Coefficient of determination
- Re:
-
Reynolds number
- S:
-
Suppression factor
- Sq :
-
Use defined source term
- v:
-
Velocity, ms−1
- x:
-
Vapor quality
- Xtt :
-
Martinelli parameter
- CAD:
-
Computer-aided design
- CFD:
-
Computational fluid dynamics
- EG:
-
Ethylene glycol
- EPE:
-
Expanded poly ethylene
- GBR:
-
Gradient boost regressor
- GSO:
-
Grid search optimization
- HTC:
-
Heat transfer coefficient
- MWCNT:
-
Multi-walled carbon nano tube
- MAE:
-
Mean absolute error
- MSE:
-
Mean square error
- RANS:
-
Reynolds averaged navier–stokes
- RMSE:
-
Root mean square error
- RNG:
-
Re-normalisation group
- RPI:
-
Rensselaer polytechnic institute
- SS:
-
Stainless steel
- SST:
-
Shear stress transport
- UVM:
-
Ultrasonic vibration machine
- bf:
-
Base fluid
- C:
-
Convective
- cb:
-
Convective boiling
- E:
-
Evaporative
- FZ:
-
Forster-Zuber’s
- g:
-
Vapor phase
- l:
-
Liquid
- nb:
-
Nucleate boiling
- np:
-
Nanoparticle
- Q:
-
Quenching
- tp:
-
Two-phase
- \(\Delta P\) :
-
Difference in wall and saturation pressure, Pa
- \(\Delta T\) :
-
Difference in wall and saturation temperature, K
- \(\alpha\) :
-
Volume fraction
- \(\varepsilon\) :
-
Rate of dissipation of turbulent kinetic energy, m2s−3
- \(\mu\) :
-
Dynamic viscosity, kgm−1 s−1
- \(\nu\) :
-
Kinematic viscosity, m2 s−1
- \(\rho\) :
-
Density, kgm−3
- \(\sigma\) :
-
Surface tension, Nm−1
- \(\tau\) :
-
Stress–strain tensor
- \(\varnothing\) :
-
Nanofluid volumetric concentration
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Acknowledgements
The authors wish to thank the University Department, RTU, Kota, and MNIT, Jaipur.
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MD: conceptualization, investigation, writing-original draft preparation. S: methodology. KS: supervision. VS: writing-reviewing and editing. GJ: formal analysis.
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Dadhich, M., Shekhar, Sambyo, K. et al. Nusselt number estimation using a GBR-GSO-based machine learning predictive model in alumina and titania nanofluids in a boiling process. J Therm Anal Calorim 148, 14225–14242 (2023). https://doi.org/10.1007/s10973-023-12619-x
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DOI: https://doi.org/10.1007/s10973-023-12619-x