The influence of Reynolds number on a plane jet
| dc.contributor.author | Deo, R. | |
| dc.contributor.author | Mi, J. | |
| dc.contributor.author | Nathan, G. | |
| dc.date.issued | 2008 | |
| dc.description.abstract | <jats:p>The present study systematically investigates through experiments the influence of Reynolds number on a plane jet issuing from a radially contoured, rectangular slot nozzle of large aspect ratio. Detailed velocity measurements were performed for a jet exit Reynolds number spanning the range 1500≤Reh≤16 500, where Reh≡Ubh/υ with Ub as the momentum-averaged exit mean velocity, h as the slot height, and υ as the kinematic viscosity. Additional centerline measurements were also performed for jets from two different nozzles in the same facility to achieve Reh=57 500. All measurements were conducted using single hot-wire anemometry to an axial distance (x) of x≤160h. These measurements revealed a significant dependence of the exit and the downstream flows on Reh despite all exit velocity profiles closely approximating a “top-hat” shape. The effect of Reh on both the mean and turbulent fields is substantial for Reh&lt;10 000 but becomes weaker with increasing Reh. The length of the jet’s potential core, initial primary-vortex shedding frequency, and far-field rates of decay and spread all depend on Reh. The local Reynolds number, Rey0.5≡2Ucy0.5/υ, where Uc and y0.5 are the local centerline velocity and half-width, respectively, are found to scale as Rey0.5∼x1/2. It is also shown that, for Reh≥1500, self-preserving relations of both the turbulence dissipation rate (ε) and smallest scale (η), i.e., ε∼Reh3(x/h)−5/2 and η∼Reh−3/4(x/h)5/8, become valid for x/h≥20.</jats:p> | |
| dc.description.statementofresponsibility | Ravinesh C. Deo, Jianchun Mi, and Graham J. Nathan | |
| dc.identifier.citation | Physics of Fluids, 2008; 20(7):075108-01-075108-16 | |
| dc.identifier.doi | 10.1063/1.2959171 | |
| dc.identifier.issn | 1070-6631 | |
| dc.identifier.issn | 1089-7666 | |
| dc.identifier.orcid | Nathan, G. [0000-0002-6922-848X] | |
| dc.identifier.uri | http://hdl.handle.net/2440/52065 | |
| dc.language.iso | en | |
| dc.publisher | Amer Inst Physics | |
| dc.rights | © 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. | |
| dc.source.uri | https://doi.org/10.1063/1.2959171 | |
| dc.title | The influence of Reynolds number on a plane jet | |
| dc.type | Journal article | |
| pubs.publication-status | Published |
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