UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Mechanics of the turbulent/non-turbulent interface of a jet

Westerweel, J; Pedersen, JM; Fukushima, C; Hunt, JCR; (2005) Mechanics of the turbulent/non-turbulent interface of a jet. Physical Review Letters , 95 (17) , Article 174501. 10.1103/PhysRevLett.95.174501. Green open access

[thumbnail of 40297.pdf]
Preview
PDF
40297.pdf

Download (337kB)

Abstract

We report the results of an experimental investigation of the mechanics and transport processes at the bounding interface between the turbulent and nonturbulent regions of flow in a turbulent jet, which shows the existence of a finite jump in the tangential velocity at the interface. This is associated with small-scale eddying motion at the outward propagating interface (nibbling) by which irrotational fluid becomes turbulent, and this implies that large-scale engulfment is not the dominant entrainment process. Interpretation of the jump as a singular structure yields an essential and significant contribution to the mean shear in the jet mixing region. Finally, our observations provide a justification for Prandtl’s original hypothesis of a constant eddy viscosity in the nonturbulent outer jet region.

Type: Article
Title: Mechanics of the turbulent/non-turbulent interface of a jet
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.95.174501
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.95.174501
Language: English
Additional information: © 2005 The American Physical Society
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/40297
Downloads since deposit
526Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item