Corrected Correlation for Turbulent Convective Heat Transfer in Concentric Annular Pipes

Jinping Xu, Zhiyun Wang and Mo Yang ()
Additional contact information
Jinping Xu: School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Zhiyun Wang: School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Mo Yang: School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

Energies, 2025, vol. 18, issue 14, 1-19

Abstract: This paper addresses the errors that arise when calculating the convective heat transfer in concentric annular pipes by using the equivalent diameter and turbulent heat transfer formula for circular pipes. This approach employs numerical simulations to solve the Reynolds-averaged Navier–Stokes equations and uses the realizable k–ε turbulence model and a low Reynolds number model near a wall. This study conducts numerical simulations of turbulent convective heat transfer within a concentric annular pipe. The results show that the shear stress on the inner wall surface of the concentric annular pipe and the heat transfer Nusselt number are significantly higher than those on the outer wall surface. At the same Reynolds number, both the entrance length and the peak velocity increase upon increasing the inner-to-outer diameter ratio. A correction factor for the inner-to-outer diameter ratio is proposed to achieve differentiated and accurate predictions for the inner and outer wall surfaces. The results clearly demonstrate the effect of the inner-to-outer diameter ratio on heat transfer.

Keywords: numerical simulation; equivalent diameter; turbulent flow; concentric annular pipe (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: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/18/14/3643/pdf (application/pdf)
https://www.mdpi.com/1996-1073/18/14/3643/ (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:18:y:2025:i:14:p:3643-:d:1698388

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 ().