Testing of Heat Transfer Coefficients and Frictional Losses in Internally Ribbed Tubes and Verification of Results through CFD Modelling

Sławomir Grądziel, Karol Majewski, Marek Majdak, Łukasz Mika, Karol Sztekler, Rafał Kobyłecki, Robert Zarzycki and Małgorzata Pilawska
Additional contact information
Sławomir Grądziel: Department of Energy, Faculty of Environmental Engineering and Energy, Cracow University of Technology, Jana Pawła II 37, 31-864 Cracow, Poland
Karol Majewski: Whirlpool Corporation, ul. Bora-Komorowskiego 6, 51-210 Wrocław, Poland
Marek Majdak: Department of Energy, Faculty of Environmental Engineering and Energy, Cracow University of Technology, Jana Pawła II 37, 31-864 Cracow, Poland
Łukasz Mika: Department of Thermal and Fluid Flow Machines, Faculty of Energy and Fuels, AGH University of Science and Technology, Mickiewicza 30, 30-059 Cracow, Poland
Karol Sztekler: Department of Thermal and Fluid Flow Machines, Faculty of Energy and Fuels, AGH University of Science and Technology, Mickiewicza 30, 30-059 Cracow, Poland
Rafał Kobyłecki: Department of Advanced Energy Technologies, Częstochowa University of Technology, Dąbrowskiego 69, 42-201 Częstochowa, Poland
Robert Zarzycki: Department of Advanced Energy Technologies, Częstochowa University of Technology, Dąbrowskiego 69, 42-201 Częstochowa, Poland
Małgorzata Pilawska: Department of Heat Processes, Air Protection and Waste Disposal, Faculty of Environmental Engineering and Energy, Cracow University of Technology, Warszawska 24, 31-155 Cracow, Poland

Energies, 2021, vol. 15, issue 1, 1-17

Abstract: This paper presents experimental determination of the heat transfer coefficient and the friction factor in an internally rifled tube. The experiment was carried out on a laboratory stand constructed in the Department of Energy of the Cracow University of Technology. The tested tube is used in a Polish power plant in a supercritical circulating fluidized bed (CFB) boiler with the power capacity of 460 MW. Local heat transfer coefficients were determined for Reynolds numbers included in the range from ~6000 to ~50,000, and for three levels of the heating element power. Using the obtained experimental data, a relation was developed that makes it possible to determine the dimensionless Chilton–Colburn factor. The friction factor was also determined as a function of the Reynolds number ranging from 20,000 to 90,000, and a new correlation was developed that represents the friction factor in internally ribbed tubes. The local heat transfer coefficient and the friction factor obtained during the testing were compared with the CFD modelling results. The modelling was performed using the Ansys Workbench application. The k-ω, the k-ε and the transition SST (Share Stress Transport) turbulence models were applied.

Keywords: frictional losses; heat transfer coefficient; internally ribbed tube; CFD modelling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/1996-1073/15/1/207/pdf (application/pdf)
https://www.mdpi.com/1996-1073/15/1/207/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:15:y:2021:i:1:p:207-:d:713631

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().