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Experimental Determination of the Friction Factor in a Tube with Internal Helical Ribs

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  • Sławomir Grądziel

    (Institute of Thermal Power Engineering, Cracow University of Technology, Al. Jana Pawła II 37, 31-864 Kraków, Poland)

  • Karol Majewski

    (EthosEnergy, ul. Paprotna 12A, 51-117 Wrocław, Poland)

Abstract

Due to the extended geometry of internally rifled tubes with helical ribs, the rate of convective heat transfer within them is much higher compared to smooth tubes. Simultaneously, a rise in the contact surface area between the fluid and the solid body increases the friction factor. This paper presents the results of experimental testing performed to determine the friction factor in an internally rifled tube with helical ribs. The tests were carried out on a purpose-built test stand. The tested object was a rifled tube used in the evaporator of a once-through supercritical power boiler operating in a power plant in Poland. The friction factor results obtained from testing are compared to the results of calculations performed by means of correlations known from the literature. Finally, using experimental data, a new correlation is developed that enables the determination of the friction factor in internally rifled tubes with helical ribs.

Suggested Citation

  • Sławomir Grądziel & Karol Majewski, 2019. "Experimental Determination of the Friction Factor in a Tube with Internal Helical Ribs," Energies, MDPI, vol. 12(2), pages 1-17, January.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:2:p:257-:d:197936
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    References listed on IDEAS

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    1. Li, Zhouhang & Tang, Guoli & Wu, Yuxin & Zhai, Yuling & Xu, Jianxin & Wang, Hua & Lu, Junfu, 2016. "Improved gas heaters for supercritical CO2 Rankine cycles: Considerations on forced and mixed convection heat transfer enhancement," Applied Energy, Elsevier, vol. 178(C), pages 126-141.
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    Cited by:

    1. Jan Taler & Paweł Ocłoń & Marcin Trojan & Abdulmajeed Mohamad, 2019. "Selected Papers from the XI International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT 2018)," Energies, MDPI, vol. 12(12), pages 1-3, June.

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