A peer-reviewed journal published by K. N. Toosi University of Technology

The empirical correlation for forced convection heat transfer of homogeneous hybrid nanofluid TiO‎2/Al2O3 in a non-uniform heat flux test section

Document Type : Research Article

Authors

1 Faculty of Engineering, Shahid Beheshti University, Tehran, Iran

2 Reactor and Nuclear Safety Research School, Nuclear Science and Technology Research Institute, Tehran, Iran

Abstract
In this research, an empirical correlation is derived to determine the Nusselt number for nanofluid forced convection flow in a vertical annulus with non-uniform heat flux. The experiments investigate the heat transfer of a homogeneous combined nanofluid composed of TiO2 and Al2O3 dispersed in water. Compared to other conventional fluids, nanofluids exhibit better heat transfer performance due to higher conductivity and reducing the thermal boundary layer. Nanofluids have the potential to function in an emergency core cooling system. A 25-bar test loop with a vertical test section generating non-uniform heat flux is used for the experiment. The tests are conducted at multiple Reynolds numbers and volumetric concentrations of the nanofluid. A new correlation for nanofluid heat performance is developed based on dimensional analysis and multiple linear regression analysis. The Nusselt number derived from the developed correlation shows high accuracy, with R2 = 0.92, indicating better performance compared to existing correlations.

Highlights

  • Analysis of forced heat transfer in an annulus using a homogeneous hybrid nanofluid with a cosine heat flux.
  • Experimental design to study the effects of nanoparticle volume fraction and Reynolds number on heat transfer.
  • Creation of correlations to predict the heat transfer behavior of the nanofluid.
  • Potential for using nanofluids as an emergency core coolant

Keywords


Abbassi, Y., Talebi, M., Shirani, A. S., et al. (2014). Experimental investigation of TiO2/Water nanofluid effects on heat transfer characteristics of a vertical annulus with non-uniform heat flux in non-radiation environment. Annals of Nuclear Energy, 69:7–13.
Alklaibi, A., Sundar, L. S., and Mouli, K. V. C. (2022). Experimental investigation on the performance of hybrid Fe3O4 coated MWCNT/Water nanofluid as a coolant of a Plate heat exchanger. International Journal of Thermal Sciences, 171:107249.
Ataei, M., Sadegh Moghanlou, F., Noorzadeh, S., et al. (2020). Heat transfer and flow characteristics of hybrid Al2O3/TiO2–water nanofluid in a minichannel heat sink. Heat and Mass Transfer, 56:2757–2767.
Borhani, M. A., Shirani, A. S., Talebi, M., et al. (2023). Comparative investigation of nanofluid heat transfer in vertical annular channel with cosine heat flux by experimental and numerical methods. Journal of Solid and Fluid Mechanics, 13(4):147–158.
Borhani, M. A., Shirani, A. S., Talebi, M., et al. (2024). Heat transfer evaluation of combined nanofluids in vertical annulus: An experimental and artificial neural network approach. Progress in Nuclear Energy, 175:105339.
Chebbi, R. (2015). Thermal conductivity of nanofluids: Effect of Brownian motion of nanoparticles. AIChE Journal, 61(7):2368–2369.
Chinchole, A., Dasgupta, A., Kulkarni, P., et al. (2019). Exploring the use of alumina nanofluid as emergency coolant for nuclear fuel bundle. Journal of Thermal Science and Engineering Applications, 11(2):021007.
Choi, S. U. and Eastman, J. A. (1995). Enhancing thermal conductivity of fluids with nanoparticles. Technical report, Argonne National Lab. (ANL), Argonne, IL (United States).
Duangthongsuk, W. and Wongwises, S. (2009). Heat transfer enhancement and pressure drop characteristics of TiO2–water nanofluid in a double-tube counter flow heat exchanger. International Journal of Heat and Mass Transfer, 52(7-8):2059–2067.
Esfe, M. H. and Saedodin, S. (2014). An experimental investigation and new correlation of viscosity of ZnO–EG nanofluid at various temperatures and different solid volume fractions. Experimental Thermal and Fluid Science, 55:1–5.
He, Y., Jin, Y., Chen, H., et al. (2007). Heat transfer and flow behaviour of aqueous suspensions of TiO2 nanoparticles (nanofluids) flowing upward through a vertical pipe. International Journal of Heat and Mass Transfer, 50(11-12):2272–2281.
Huang, D., Wu, Z., and Sunden, B. (2016). Effects of hybrid nanofluid mixture in plate heat exchangers. Experimental Thermal and Fluid Science, 72:190–196.
Hwang, Y.-j., Lee, J., Lee, C., et al. (2007). Stability and thermal conductivity characteristics of nanofluids. Thermochimica Acta, 455(1-2):70–74.
Pak, B. C. and Cho, Y. I. (1998). Hydrodynamic and heat transfer study of dispersed fluids with submicron metallic oxide particles. Experimental Heat Transfer an International Journal, 11(2):151–170.
Rizwan, M., Hassan, M., Makinde, O. D., et al. (2022). Rheological modeling of metallic oxide nanoparticles containing non-newtonian nanofluids and potential investigation of heat and mass flow characteristics. Nanomaterials, 12(7):1237.
Sajid, M. U. and Ali, H. M. (2019). Recent advances in application of nanofluids in heat transfer devices: a critical review. Renewable and Sustainable Energy Reviews, 103:556–592.
Sánchez-Escalona, A. A., Camaraza-Medina, Y., Góngora Leyva, E., et al. (2022). New Approach to Obtain the Mean Heat Transfer Coefficients for Single-Phase Fluid Flow Inside Tubes by Simulating Evolution of Nusselt Equation (I). International Journal of Heat & Technology, 40(1).
Talebi, M., Borhani, M. A., Zadeh, S. M., et al. (2022). Experimental analysis of forced convection heat transfer of Hybrid Nanofluids in a vertical annulus with cosine heat flux. Progress in Nuclear Energy, 153:104438.
Timofeeva, E. V., Gavrilov, A. N., McCloskey, J. M., et al. (2007). Thermal conductivity and particle agglomeration in alumina nanofluids: experiment and theory. Physical Review EStatistical, Nonlinear, and Soft Matter Physics, 76(6):061203.
Vallejo, J. P., Prado, J. I., and Lugo, L. (2022). Hybrid or mono nanofluids for convective heat transfer applications. A critical review of experimental research. Applied Thermal Engineering, 203:117926.
Wang, J., Zhai, Z., Zheng, D., et al. (2021). Investigation of heat transfer characteristics of Al2O3-water nanofluids in an electric heater. Heat Transfer Engineering, 42(19-20):1765–1774.
Wang, X., Xu, X., and Choi, S. U. (1999). Thermal conductivity of nanoparticle-fluid mixture. Journal of Thermophysics and Heat Transfer, 13(4):474–480.
Wang, Y., Deng, K., Wu, J., et al. (2020). A mechanism of heat transfer enhancement or deterioration of nanofluid flow boiling. International Journal of Heat and Mass Transfer, 158:119985.
Xuan, Y. and Roetzel, W. (2000). Conceptions for heat transfer correlation of nanofluids. International Journal of heat and Mass transfer, 43(19):3701–3707.
Volume 6, Issue 2
Winter 2025
Pages 1-6

  • Receive Date 10 July 2024
  • Revise Date 15 September 2024
  • Accept Date 07 October 2024