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Title:Basic study of jet flow patterns related to stream and reservoir behavior
Author(s):Maxwell, W. Hall C.; Pazwash, Hormoz
Contributor(s):University of Illinois at Urbana-Champaign
Subject(s):Water resources center
Water resources center--Illinois
Hydrology and hydraulics
Air-water interfaces
Boundaries (surfaces)
Flow characteristics
Flow profiles
Free surfaces
Geographic Coverage:Illinois (state)
Abstract:An experimental study of the modification of jet flow patterns by a nearby free surface is described. The tests were conducted in an eighteen foot diameter, four foot deep reservoir. One flow pattern, for a 1/2-in. diameter nozzle submerged 5-in. below the free surface was studied in detail. Other combinations of nozzle diameter, submergence and discharge were used to study the locus of the maximum velocity of the flow pattern as the flow moved downstream. In addition, the influence of an intake placed close to the jet was investigated. The flow patterns were found to be quite different from those for a deeply submerged jet. The maximum velocity moves upward as the flow proceeds downstream and eventually reaches the free surface. The lower part of the velocity distribution closely resembles that for a deeply submerged jet, whereas, the upper part is modified by wave action at the free surface. . As a result there is increased spreading of the flow pattern at the free surface. A nearby intake was found to have negligible influence on the flow pattern. The velocities induced in the region of the jet by the intake are very low relative to those in the jet itself. The jet discharge is concentrated in a narrow conical form whereas the intake gathers fluid from all directions. The results may be applied in the design of discharge outlets, syphon spillway outlets, hydraulic breakwaters and in estimating concentrations of pollutants, temperatures or velocity profiles downstream from outlets when density differences are small.
Issue Date:1967-07
Publisher:University of Illinois at Urbana-Champaign. Water Resources Center
Genre:Report (Grant or Annual)
Sponsor:U.S. Department of the Interior
U.S. Geological Survey
Rights Information:Copyright 1967 held by W. Hall C. Maxwell, Hormoz Pazwash
Date Available in IDEALS:2016-05-25

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