Imaging Air-Water Flows
Investigators
A. Kruger &
M. V. Muste
Research Objective
A recent development in the area of experimental investigation at IIHR
is the use of Large-Scale Particle Image Velocimetry (LSPIV) for flow analysis. One
example is the analysis of aeration processes downstream from a spillway and their
sensitivity to changes in the spillway design.
Accomplishments
The need of imaging nonintrusive technique for this application was generated by the
fact that there was no experimental tools capable to provide velocity information in the
existing flow conditions. The flow was highly unsteady, three-dimensional, with vigorous
entrainment and release of air, as can be observed in Figure 1. Typical results of the
investigation are instantaneous velocity vector fields over the imaged area (roughly 4
square meters). Averaging over a significant time intervals (thousands of recorded video
frames), mean velocity field as the one plotted in Figure 2 can be obtained. The employed
imaging technique provided an accurate description of the mean flow along with information
on the large scale turbulence, a relevant flow feature for the air transport processes of
interest.
Figures
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