Hydraulic jump in circular pipes

Hydraulic jumps in conduits containing free surface now have received pract ically no attention. This project was conducted to investigate experimental ly the main features of such jumps and to obtain limits for conduit choking . The sequent depth ratio is determined in terms of the approach Froude num ber based on the conventional momentum approach. The lengths of the surface recirculation and aeration zones are also considered. Two different appear ances of jumps are discussed and it is demonstrated that jumps with a small approach depth differ from those with a depth larger than about 30% of the conduit diameter. A choking condition is proposed for which conduits are s ubjected to full pipe downstream flow. Photographs are used to describe the main flow pattern. The results of this study are readily applicable for de sign.