AIR CONCENTRATION DISTRIBUTION IN SELF-AERATED FLOW

A criterion for the development length of self-aerated flow over a spillway has been obtained by analysis of published and new experimental data. The new data were collected on a spillway model having a slope of 1(V):0.75(H). Because of the limited length (3 m) of the spillway model, the data collected during the present investigation correspond only to the developing region. The published data, however, correspond to both the developing and developed flow regions. The slope of the spillway for the published data range from 7.5-degrees to 75-degrees. The scaling parameters used in the theory of Rao et al. [9] have been evaluated and empirical relations obtained for these both in developing and developed regions, thereby making the construction of air concentration profiles possible for given spillway geometry and approach flow conditions.