Flow Pattern Control by Entrainment Regulation

by W. Hall C. Maxwell, (F.ASCE), Assoc. Prof.; Dept. of Civ. Engrg., Univ. of Illinois at Urbana-Champaign, Urbana, Ill.,
Misganaw Demissie, Grad. Research Asst.; Hydr. Section, Illinois State Water Survey, Urbana, Ill.,

Serial Information: Journal of the Hydraulics Division, 1977, Vol. 103, Issue 10, Pg. 1121-1134

Document Type: Journal Paper


A technique for controlling the flow to a vortex zone trapped between the top of a shallow submerged slot outlet, the free surface, and two lateral wing-walls is examined experimentally to show that it may be used to control the flow pattern near the slot outlet. The range of wing-wall crest elevations for which flow patterns may be controlled is shown to be a function of wing-wall length. The stability of the flow pattern is also examined experimentally and found to depend, for a particular wing-wall spacing, on the submergence of the slot outlet and on a Froude number based on average outlet velocity and wall spacing. The flow pattern control technique may have value in back-fitting some existing outfalls on thermal power plant outlets where strict temperature control is required.

Subject Headings: Submerged flow | Flow control | Flow patterns | Regulated flow | Entrainment | Free flow | Submerging | Spacing

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