Separated Flow Through Large Sudden Expansions

by Prabhulal R. Mehta, Prof.; Dept. of Civ. Engrg., Faculty of Tech., Kalabhavan, P.B. No. 41, Baroda, 380 001, Gujarat State, India; formerly, Prof. and Head Dept. of Civ. Engrg., S.V. Regional Engrg. Coll., Surat, India,

Serial Information: Journal of the Hydraulics Division, 1981, Vol. 107, Issue 4, Pg. 451-460

Document Type: Journal Paper


Flow patterns for large, sudden expansions have been obtained experimentally. The experimental studies reveal that flow patterns for large expansions are highly asymmetric and unsteady. Two distinct types of flow have been observed in which the flow characteristics are essentially mirror images of each other. Turbulence develops peak values earlier and decays faster with increasing expansion ratios. Because of the increased turbulent mixing with increased expansion ratio, the mean flow pattern becomes steady and uniform more rapidly with increased expansion ratios. For the Reynolds number range 0.5 x 105 to 1.0 x 105, there is no Reynolds number influence on these flow patterns.

Subject Headings: Flow patterns | Flow separation | Reynolds number | Unsteady flow | Asymmetry | Imaging techniques | Turbulence | Decomposition

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