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Type: Journal article
Title: Effect of exit Reynolds number on self-preservation of a plane jet
Author: Mi, J.
Feng, B.
Deo, R.
Nathan, G.
Citation: Acta Physica Sinica, 2009; 58(11):7756-7764
Publisher: Chinese Physical Soc
Issue Date: 2009
ISSN: 1000-3290
Statement of
Mi, Jianchun; Feng, Bao-Ping; Deo, Ravinesh C. and Nathan, Graham J.
Abstract: We investigated in experiment the effect of exit Reynolds number on self-preservation of a turbulent plane jet. Centerline velocity statistics were measured in plane jets issuing from the same nozzle but, respectively, with seven Reynolds numbers varying between Re=4,582 and Re=57,735, where Re≡Ujh/ν (Uj being the momentum-averaged exit mean velocity, h the slot height and ν the kinematic viscosity). All measurements were conducted using single hot-wire anemometry and over an axial distance (x) of 40 h. These measurements revealed a significant Re-dependence of either the mean or turbulent flow field. As Re increases, the pace of the jet development decreases and, as a result, both the mean and turbulent properties reach their self-preserving states over a longer downstream distance (x). The centerline integral scale L for all jets grows linearly with x and the growth rate decreases as Re is increased. It is also found that the local Reynolds number ReL scales with x as ReL∝x1/2. The study suggests that differences of the self-preserving states observed may be related to the differences in the underlying turbulence structures in the near field of the seven jets.
Keywords: plane jet; Reynolds number; self-preservation
Rights: Copyright 2009 Chinese Physical Society
RMID: 0020093493
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Appears in Collections:Mechanical Engineering publications
Environment Institute Leaders publications

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