Pressurization and Depressurization in Pipe Flowsby Charles C. S. Song, Univ of Minnesota, St. Anthony Falls, Hydraulic Lab, Minneapolis, MN, USA,
Abstract: When a closed conduit drainage system is subjected to variable inflow rates, the change in flow regimes between free surface flow and pressurized flow may take place. A rising hydrograph causes pressurization or regime change from free surface flow to pressurized flow. A falling hydrograph causes depressurization or a reverse flow regime change. Not much effort has been made to simulate the detailed unsteady flows involving mixed flow regimes and regime change. This paper discusses experimental and computational research works carried out in the past few years that resulted in a better understanding of the problem and workable computer codes.
Subject Headings: Pressurized flow | Free flow | Hydrographs | Flow simulation | Drainage systems | Inflow | Free surfaces | Overland flow
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