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Air entrainment in hydraulic jumps in pipelines

Air entrainment in hydraulic jumps in pipelines

Air entrainment in hydraulic jumps in pipelines

(OP)
Hi - I am looking for some information on how to calculate the amount of air entrained by the formation of a hydraulic jump in a fairly large (DN2700) pipeline.

Thanks!

RE: Air entrainment in hydraulic jumps in pipelines

For a pressured pipeline and, if air was available, you could assume that content in solution reaches the solution equilibrium for air and water at the water's pressure and temperature at that point in the pipeline.  Entrained air would be the difference in the quantity of air being supplied over what would dissolve.  The air being supplied would probably be something like the solution limit of air and water at the pipeline's intake, or at the last air dump valve.

If there was no air in contact with the water at the jump, any vapor space would be filled with 100% water vapor which would collapse back to liquid with the next sufficient increase in pressure or reduction in temperature.  In that case you must calculate the depth of liquid flow in the pipeline for the slope and flowrate in the segment, the vapor space being the remaining volume.  

If there was air contact at the jump, I think you would have to know the quantity being supplied.  Again the entrained air downstream being the difference between that and the solution limit.

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