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Department of Mechanical and Aerospace Engineering
University of California at San Diego
Abstract-
Engineering practice for sewage treatment was largely established in the
19th Century, and is based on estimates of bulk flow rates. In this talk I
will discuss the dynamics of particle-laden flows in confined geometries
and show that far more complex flows occur in practice. The presence of
particles in the liquid leads to buoyancy effects, including gravity
currents and internal gravity waves. These buoyancy forces change the
dynamics substantially from those that would be appropriate for bulk flow
calculations. Consequently, the design criteria require significant
revision. A range of particle-laden flows will be illustrated in laboratory
experiments, and models of these flows will be described. It will be shown
how the deposition of particulate depends on the properties of the inflow
and how this can be regulated to obtain the most efficient removal of
sewage. Other applications such as turbidity currents and avalanches will
be discussed briefly.
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