Do you happen to have or know of a table for various pipe diameters showing what pipeline velocity is required to discharge air pockets for different degrees of vertical changes in pipe (i.e. 30-deg., 60-deg., 90-deg [vertical downward])? This would be very helpful.
Theoretical and experimental results vary. I found a cool paper attempting to survey the best available publications on it, and integrate that data into a comparative graph (numbered page 47). eprints.hrwallingford.com/551/1/SR649.pdf You will have to calculate the x-axis term based on pipe backslope (in radians). And calculate the y-axis term based on flow velocity, pipe diameter, and gravity. (Watch the units of each term.) There's quite a variation in predictions ... but it can give you a general idea if your scenario is good or bad.
Do you happen to have or know of a table for various pipe diameters showing what pipeline velocity is required to discharge air pockets for different degrees of vertical changes in pipe (i.e. 30-deg., 60-deg., 90-deg [vertical downward])? This would be very helpful.
Theoretical and experimental results vary. I found a cool paper attempting to survey the best available publications on it, and integrate that data into a comparative graph (numbered page 47). eprints.hrwallingford.com/551/1/SR649.pdf You will have to calculate the x-axis term based on pipe backslope (in radians). And calculate the y-axis term based on flow velocity, pipe diameter, and gravity. (Watch the units of each term.) There's quite a variation in predictions ... but it can give you a general idea if your scenario is good or bad.
good information.nicely explained!