Buoyant surface jets discharged into a strong crossflow

Lin, Chi-Yu; Holley, Edward R.; Maxwell, W. Hall C.

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https://hdl.handle.net/2142/90140 Copy

Description

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

Issue Date

1977-04

Keyword(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.

Publisher

University of Illinois at Urbana-Champaign. Water Resources Center

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/90140

Sponsor(s)/Grant Number(s)

• U.S. Department of the Interior
• U.S. Geological Survey

Copyright and License Information

Copyright 1977 held by Chi-Yu Lin, Edward R. Holley, W. Hall C. Maxwell

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