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Free Convection Heat Transfer from Horizontal Cylinders

Author

Listed:
  • Janusz T. Cieśliński

    (Faculty of Mechanical and Ocean Engineering, Gdańsk University of Technology, Narutowicza 11/12, 80233 Gdansk, Poland)

  • Slawomir Smolen

    (Faculty of Nature and Engineering, City University of Applied Sciences Bremen, Neustadtswall 30, 28199 Bremen, Germany)

  • Dorota Sawicka

    (Faculty of Nature and Engineering, City University of Applied Sciences Bremen, Neustadtswall 30, 28199 Bremen, Germany)

Abstract

The results of experimental investigation of free convection heat transfer in a rectangular container are presented. The ability of the commonly accepted correlation equations to reproduce present experimental data was tested as well. It was assumed that the examined geometry fulfils the requirement of no-interaction between heated cylinder and bounded surfaces. In order to check this assumption recently published correlation equations that jointly describe the dependence of the average Nusselt number on Rayleigh number and confinement ratios were examined. As a heat source served electrically heated horizontal tube immersed in an ambient fluid. Experiments were performed with pure ethylene glycol (EG), distilled water (W), and a mixture of EG and water at 50%/50% by volume. A set of empirical correlation equations for the prediction of Nu numbers for Rayleigh number range 3.6 × 10 4 < Ra < 9.2 × 10 5 or 3.6 × 10 5 < Ra q < 14.8 × 10 6 and Pr number range 4.5 ≤ Pr ≤ 160 has been developed. The proposed correlation equations are based on two characteristic lengths, i.e., cylinder diameter and boundary layer length.

Suggested Citation

  • Janusz T. Cieśliński & Slawomir Smolen & Dorota Sawicka, 2021. "Free Convection Heat Transfer from Horizontal Cylinders," Energies, MDPI, vol. 14(3), pages 1-22, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:3:p:559-:d:485052
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    Citations

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    Cited by:

    1. Luke Jurgen Briffa & Charise Cutajar & Tonio Sant & Daniel Buhagiar, 2022. "Numerical Modeling of the Thermal Behavior of Subsea Hydro-Pneumatic Energy Storage Accumulators Using Air and CO 2," Energies, MDPI, vol. 15(22), pages 1-20, November.
    2. Florent Bunjaku & Risto V. Filkoski, 2023. "Optimisation of Thermal and Geometric Parameters of Cylindrical Fins during Natural Convection," Energies, MDPI, vol. 16(4), pages 1-14, February.
    3. Janusz T. Cieśliński & Slawomir Smolen & Dorota Sawicka, 2021. "Effect of Temperature and Nanoparticle Concentration on Free Convective Heat Transfer of Nanofluids," Energies, MDPI, vol. 14(12), pages 1-19, June.
    4. Dorota Sawicka & Janusz T. Cieśliński & Slawomir Smolen, 2021. "Experimental Investigation of Free Convection Heat Transfer from Horizontal Cylinder to Nanofluids," Energies, MDPI, vol. 14(10), pages 1-14, May.

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