Search results for: TRANSITION TO TURBULENCE

• Navier number and transition to turbulence

  Publication

  • P. Ziółkowski
  • J. Badur

  - Journal of Physics : Conference Series - Year 2014

  The motivation behind this article is to explain a role of the Navier number (Na -dimensionless slip-length) in prediction of closures for laminar to turbulent transition undergoing via eddies detachment from the slip layer in nano-cannals. Additionally the role of the Navier number Na in universal modeling of phenomenon of enhanced mass flow rate reported in micro- and nano-channels has been explained. The Na number should be...

  Full text available to download

• Local Nusselt number evaluation in the case of jet impingement

  Publication

  • T. Kura
  • E. Fornalik-Wajs
  • J. Wajs
  • S. Kenjeres

  - Year 2018

  Jet impingement still is one of demanding cases regarding computational fluid dynamics, due to its highly turbulent behaviour, with occurrence of turbulent-laminar transition. Even recently developed methods exhibit some drawbacks – RANS based simulations lack accuracy, LES and DNS based ones require too much computational time. Hybrid methods also exist, but their development and validation is in progress. Nevertheless, CFD application...

  Full text available to download