Energy exchange analysis of a closed conduit transient mixed flow following an air pocket entrapment using a simplified shock-fitting approach

The effects of different variables closed conduit transient partially pressurized flows on the maximum air pressure are investigated from an energy exchange perspective. It was found that when length increases, decreases because a larger portion driving will be stored as kinetic in flow and is dissipated by friction force. In contrast, water depth free-surface dissipating decrease. Thus, absorbed pocket increases. However, after ratio 0.8, even though reason moving interface receives enough energy, pressurization zone occurs. Note this experimentally observed Hamam McCorquodale (1982).