English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

This paper presents a new theory of turbulence in time-independentnon-Newtonian fluids. The wall layer is modelled in terms of unsteady exchangeof viscous momentum between the wall and the main stream, following the classicvisualisation of inrush-sweep-ejection/burst. The thickness of the wall layeris found to be the same for Newtonian and purely viscous non-Newtonian fluids,when normalised with the instantaneous wall parameters at the onset ofbursting. The results indicate that the mechanisms of turbulence in Newtonianand time-independent fluids are identical when structural similarity relationsin turbulence are based on phase-locked parameters linked with the developmentof secondary flows rather than on time-averaged wall parameters. Thissimilarity analysis collapses the local critical instantaneous friction factordata of both Newtonian and non-Newtonian fluids at the point of bursting into asingle curve. The method greatly simplifies the analysis of turbulent transportphenomena in non-Newtonian fluids.  Keywords: Turbulence, time-independent non-Newtonian, Power law, pipe flow,wall layer

The Instantaneous Wall Viscosity in Pipe Flow of Power Law Fluids: Case Study for a Theory of Turbulence in Time-Independent Non-Newtonian Fluids