Author(s): W. H. Hager; K. Kramer
Linked Author(s):
Keywords: Ir entrainment; Chute; Experiments; History; Hydraulics
Abstract: The history of chute flow aeration was partly written in Europe, and continued after World War II mainly in the USA. Whereas the first work by the Austrian Ehrenberger involved simple instrumentation to capture the basic characteristics of air-water flow, these were improved mainly by the Frenchman Halbronn and the American Straub. Towards the end of the 1950s-corresponding roughly to the period of the present review-instrumentation was improved so much that the first reliable data could be collected. Until 1960, no definite equation for the flow features of high-speed air-water mixtures were proposed, but the data served for more elaborate analysis mainly in the 1980s. The present paper thus would like to shed light on a chapter of hydraulic engineering that has had a significant effect of hydraulic engineering. Even today, that research chapter has not been finalized, given the many questions still open on gradually varied flow, the effect of roll waves on self aeration, and the detrainment of high-speed flow on relatively flat chutes.
Year: 2003