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Analytical Prediction of Turbulent Friction Factor in Circular Pipe Under Supercritical Conditions

[+] Author Affiliations
Jinguang Zang

Tsinghua University, Beijing, ChinaCNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Chengdu, China

Xiao Yan, Zejun Xiao, Yanping Huang

CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Chengdu, China

Shanfang Huang

Tsinghua University, Beijing, China

Paper No. ICONE20-POWER2012-55159, pp. 741-750; 10 pages
doi:10.1115/ICONE20-POWER2012-55159
From:
  • 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference
  • Volume 3: Thermal-Hydraulics; Turbines, Generators, and Auxiliaries
  • Anaheim, California, USA, July 30–August 3, 2012
  • Conference Sponsors: Nuclear Engineering Division, Power Division
  • ISBN: 978-0-7918-4497-7
  • Copyright © 2012 by ASME

abstract

An analytical method was proposed for the prediction of the turbulent friction factor in a circular pipe under supercritical conditions. The friction factor equation was based on the new wall function by Van Direst transformation which is widely used in compressed flow. The law of the wall of two layers was used and integrated over the entire flow area to obtain the algebraic form of the turbulent friction factor. The new turbulent friction formula was first adjusted to Colebrook equation in isothermal flow at supercritical pressures. And then it was validated in heated supercritical flow by several existing correlations. Similar trends were found between them, which confirms the physical validity of the new frictional formula. The theoretical analysis also shows that the friction factor due to the variation of fluid property at supercritical pressures is mainly caused by the density and viscosity variation. In viscous sublayer, both the viscosity play the main role, while in turbulent sublayer, only the density do.

Copyright © 2012 by ASME
Topics: Friction , Turbulence , Pipes

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