A Novel Explicit Equation for Friction Factor in Smooth and Rough Pipes

AVCI A., KARAGÖZ İ.

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME, cilt.131, sa.6, 2009 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 131 Sayı: 6
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1115/1.3129132
  • Dergi Adı: JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: boundary layer turbulence, channel flow, friction, pipe flow, rough surfaces, TURBULENT PIPE, CHANNEL FLOWS, WALL
  • Bursa Uludağ Üniversitesi Adresli: Evet

Özet

In this paper, we propose a novel explicit equation for friction factor, which is valid for both smooth and rough wall turbulent flows in pipes and channels. The form of the proposed equation is based on a new logarithmic velocity profile and the model constants are obtained by using the experimental data available in the literature. The proposed equation gives the friction factor explicitly as a function of Reynolds number and relative roughness. The results indicate that the present model gives a very good prediction of the friction factor and can reproduce the Colebrook equation and its Moody plot. Therefore, the new approximation for the friction factor provides a rational, accurate, and practically useful method over the entire range of the Moody chart in terms of Reynolds number and relative roughness.