Filling of empty spray header for surge analysis

[novis76]

Hello, I am doing a surge analysis of a empty spray system. The system consists of a high riser-line (vertical pipe) connected to a horizontal spray nozzle header. The riser line is drained before the pump is started. When the pump starts the pipes fill up. As a first assumption I assumed the void front was flat/distinct (a step). However, I am curious, how the filling part looks like in reality. What kind of air intrusion can I expect? Due to the low resistance in the system the water speed is high prior to the filling of the spray header (froude number well above 1).

I realize that it is a hard question to answer in detail but if someone can suggest any reading tips about these events or speak from their own experience it would be helpful.

best regards

keyword: filling of empty pipes, water hammer

 

[BigInch]

Probably much less than you think. Try a test with water in some clear plastic pipe.

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