dc.contributor.author | Arosemena, Arturo | |
dc.contributor.author | Solsvik, Jannike | |
dc.date.accessioned | 2022-03-04T08:42:11Z | |
dc.date.available | 2022-03-04T08:42:11Z | |
dc.date.created | 2021-09-28T23:57:57Z | |
dc.date.issued | 2022 | |
dc.identifier.citation | European journal of mechanics. B, Fluids. 2022, 91 1-8. | en_US |
dc.identifier.issn | 0997-7546 | |
dc.identifier.uri | https://hdl.handle.net/11250/2982991 | |
dc.description.abstract | The data of Arosemena et al. (2021), consisting of turbulent channel flow simulations of generalized Newtonian (GN) fluids, are considered to study the effects of shear-dependent rheology on the nonzero velocity–vorticity correlations and the mean dynamics. In the near-wall region and compared to Newtonian channel flow, the velocity–vorticity products contributing to the turbulent inertia term decrease/increase with shear-thinning/thickening fluid behaviour suggesting that with e.g. shear-thinning rheology, the sublayer streaks are more stable, the near-wall vortical motions are dampened and there is a narrower range of turbulent length scales. The mean momentum balance analysis, on the other hand, revealed that the four-layer structure first recognized by Wei et al. (2005a) remains for all GN fluids and that the shear-dependent rheology only seems to influence the location of the layers. For instance, with shear-thinning behaviour, layers II and III are thicker and there is an increase in the importance of the viscous forces in these intermediate layers. The influence of shear-thinning/thickening fluid behaviour on the extent of the layers II and III is found remarkably similar to an increase/decrease of the Reynolds number for Newtonian channel flow. These findings suggest that the shear-dependent rheology should also be taken into account for proper scaling of the intermediate layers. A potential length scale factor is proposed and its suitability is tested. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | Elsevier | en_US |
dc.rights | Navngivelse 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | * |
dc.title | Velocity--vorticity correlations and the four-layer regime in turbulent channel flow of generalized Newtonian fluids | en_US |
dc.type | Peer reviewed | en_US |
dc.type | Journal article | en_US |
dc.description.version | publishedVersion | en_US |
dc.source.pagenumber | 1-8 | en_US |
dc.source.volume | 91 | en_US |
dc.source.journal | European journal of mechanics. B, Fluids | en_US |
dc.identifier.doi | 10.1016/j.euromechflu.2021.08.006 | |
dc.identifier.cristin | 1940178 | |
dc.relation.project | Norges forskningsråd: 274398 | en_US |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 1 | |