Stability and mixing of a vertical round buoyant jet in shallow water
Name
MIT-EL-74-014-02009388.pdf
Size
4.35 MB
Format
Adobe PDF
Checksum (MD5)
c4a4d7978d216b64847b4ca1a758f29f
Author(s)
Lee, Joseph Hun-Wei
Jirka, Gerhard Hermann
Harleman, Donald R. F.
Date Issued
1974
Publisher
MIT Energy Lab
Series/Report no.
MIT-EL
74-014
Abstract
Discharging heated water through submerged vertical round ports
located at the bottom of a receiving water body is a currently used
method of waste heat disposal. The prediction of the temperature
reduction in the near field of the buoyant jet is a problem of
environmental concern.
The mechanics of a vertical axisymmetric buoyant jet in shallow
water is theoretically and experimentally investigated. Four flow
regimes with distinct hydrodynamic properties are discerned in the
vicinity of the jet: the buoyant jet region, the surface impingement
region, the internal hydraulic jump, and the stratified counterflow
region. An analytical framework is formulated for each region. The
coupling of the solutions of the four regions yields a prediction of
the near field stability as well as the temperature reduction of the
buoyant discharge.
It is found that the near field of the buoyant jet is stable only
for a range of jet densimetric Froude numbers and submergences. A theoretical solution is given for the stability criterion and the dilution of
an unstable buoyant jet.
A series of experiments were conducted to verify the theory. The
experimental results are compared to the theoretical predictions. Good
agreement is obtained.
Description
Also issued as a M.S. thesis in the Department of Civil Engineering at Massachusetts Institute of Technology
Subjects
Jets -- Fluid dynamics
Waste heat
Thermal pollution of rivers, lakes
Persistent DSpace Link
