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Numerical study of natural convection heat transfer in a heat exchanger filled with nanofluids

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  • Garoosi, Faroogh
  • Hoseininejad, Faraz
  • Rashidi, Mohammad Mehdi

Abstract

Natural convection of nanofluids around several pairs of hot and cold cylinders in an adiabatic enclosure is investigated numerically. Hot and cold cylinders are maintained at the different constant temperatures (Th > Tc) while the walls of the enclosure are thermally insulated. A parametric study is undertaken to explore the effects of the pertinent parameters, such as; Rayleigh number, size and type of the nanoparticles, shape of the enclosure, orientation and number of the hot and cold cylinders on the fluid flow and heat transfer characteristic. The simulations show that at low Ra, by changing shape of the enclosure from square to triangular one, the heat transfer rate decreases. It is also found that at each Ra, there is an optimum volume fraction of nanoparticles (ϕopt) where the heat transfer rate within the enclosure has a maximum value. Moreover, the results of this study showed by altering orientation of the hot and cold cylinders from horizontal to vertical mode, the heat transfer rate enhances. Finally, the results indicated that, by decreasing the size of the nanoparticles, the heat transfer rate and optimal particle loading (ϕopt) enhances.

Suggested Citation

  • Garoosi, Faroogh & Hoseininejad, Faraz & Rashidi, Mohammad Mehdi, 2016. "Numerical study of natural convection heat transfer in a heat exchanger filled with nanofluids," Energy, Elsevier, vol. 109(C), pages 664-678.
    • Handle: RePEc:eee:energy:v:109:y:2016:i:c:p:664-678
    DOI: 10.1016/j.energy.2016.05.051
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    Cited by:

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    2. Mikhailenko, Stepan A. & Sheremet, Mikhail A. & Pop, Ioan, 2020. "Natural convection combined with surface radiation in a rotating cavity with an element of variable volumetric heat generation," Energy, Elsevier, vol. 210(C).
    3. Zheng, Bin & Sun, Peng & Liu, Yongqi & Zhao, Qiang, 2018. "Heat transfer of calcined petroleum coke and heat exchange tube for calcined petroleum coke waste heat recovery," Energy, Elsevier, vol. 155(C), pages 56-65.
    4. Sardar Bilal & Imtiaz Ali Shah & Kaouther Ghachem & Abdelkarim Aydi & Lioua Kolsi, 2023. "Heat Transfer Enhancement of MHD Natural Convection in a Star-Shaped Enclosure, Using Heated Baffle and MWCNT–Water Nanofluid," Mathematics, MDPI, vol. 11(8), pages 1-18, April.
    5. Aprea, C. & Greco, A. & Maiorino, A. & Masselli, C., 2020. "The use of barocaloric effect for energy saving in a domestic refrigerator with ethylene-glycol based nanofluids: A numerical analysis and a comparison with a vapor compression cooler," Energy, Elsevier, vol. 190(C).
    6. Zhang, H. & Yang, H. & Chen, H.J. & Du, X. & Wen, D. & Wu, H., 2017. "Photothermal conversion characteristics of gold nanoparticles under different filter conditions," Energy, Elsevier, vol. 141(C), pages 32-39.
    7. Bohacek, Jan & Raudensky, Miroslav & Astrouski, Ilya & Karimi-Sibaki, Ebrahim, 2021. "An optimal design for hollow fiber heat exchanger: A combined numerical and experimental investigation," Energy, Elsevier, vol. 229(C).

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