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Title:Buoyant surface jets discharged into a strong crossflow
Author(s):Lin, Chi-Yu; Holley, Edward R.; Maxwell, W. Hall C.
Contributor(s):University of Illinois at Urbana-Champaign
Subject(s):Water resources center
Water resources center--Illinois
Hydrology and hydraulics
Fluid mechanics
Heated water
Mixing
Interfaces
Rivers
Thermal pollution
Thermal stratification
Water temperature
Geographic Coverage:Illinois (state)
Abstract:Analytical and experimental investigations were carried out for three-dimensional buoyant surface jets with strong ambient flow but without boundary attachment. A numerical model in curvilinear coordinates was developed from an integral jet analysis modified for buoyancy effects and included asymmetry of the jet. Detailed temperature distributions were measured in the laboratory with densimetric Froude numbers (F̥) of 5, 10 and 15 and 0 velocity ratios (R) from 2 to 13. Experimental results showed that ambient crossflows can cause significant distortion of the jet, even for R = 13. Near the exit, the lower portion of the jet is swept toward the lee side of the jet. The resulting L-shaped cross section and the associated density instability may enhance spreading on the lee side and may contribute to the subsequent formation of bimodal temperature distributions. The jet bending increases as R decreases and as F̥ increases. Dilution increases with increasing F̥ and decreasing R. The model was calibrated against the entire set of measured temperatures for each run and is capable of predicting temperature 0 distributions to an accuracy of 0.63C˚. The agreement could probably be improved by using similarity profiles better suited to the actual jet cross sectional shape which was not known at the beginning of the research.
Issue Date:1977-04
Publisher:University of Illinois at Urbana-Champaign. Water Resources Center
Genre:Report (Grant or Annual)
Type:Text
Language:English
URI:http://hdl.handle.net/2142/90140
Sponsor:U.S. Department of the Interior
U.S. Geological Survey
Rights Information:Copyright 1977 held by Chi-Yu Lin, Edward R. Holley, W. Hall C. Maxwell
Date Available in IDEALS:2016-05-23


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