Abstract
Regarding air-entraining vortices in a suction sump, critical submergence Sc were specified concerning five parameters, such as the Froude number Fr, the Reynolds number Re, back clearance X, sump breadth B, and bottom clearance Z. Here, all parameters are non-dimensionalized by suction-pipe outer diameter D and Bell-mouth-entrance velocity. Consequently, the authors confirmed that Re effect is rather small, while Fr effect is large. X/D effect is also small. Most of X/D, B/D and Z/D effects can be explained on the basis of Fr-Sc/D relation, except for the X/D effect by which Sc/D attains the maximum value.
