Estimating flow depth in partially filled pipe.
Estimating flow depth in partially filled pipe.
(OP)
Just wondering how would I estimate the flow height of a partially filled pipe?
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Robert Markoski - Project/Mechanical Engineer
wwww.RobertMarkoski.net/Engineering





RE: Estimating flow depth in partially filled pipe.
Then it depends on the relative velocities of the liquid and gas fractions and the volume flow rates and whether the pipe is vertical or horizontal.
See "The Flow of Complex Mixtures in Pipes", authors Govier and Aziz, for many chapters worth.
Mike Halloran
Pembroke Pines, FL, USA
RE: Estimating flow depth in partially filled pipe.
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Robert Markoski - Project/Mechanical Engineer
wwww.RobertMarkoski.net/Engineering
RE: Estimating flow depth in partially filled pipe.
RE: Estimating flow depth in partially filled pipe.
HL, head loss between points 1 and 2, must be calculated using the hydraulic radius for partially filled pipe, which requires knowledge of the depth, so its an iterative calculation. See open channel flow for semi-circular channel cross-sections.
Depth of flow can be estimated by the V22/(2g) term, as it equals depth at the critical flowrate, where frictional flow loss equals energy gained by the reduction in elevation caused by the slope of the channel. Flowrates slower than that will be below Dcritical, faster will be higher.
You might try this,
A 1 foot drop in elevation is roughly equivalent to 1/2 psi flow loss, so find your pipe flowrate that gives 1/2 psi loss over the pipe's length and limit the elevation drop of that run to 1 foot. That will approximate the depth at the critial flowrate which will remain constant with the slope of the pipe. Compare your flowrate with the critical flowrate at that depth to estimate the depth you'll have with your flowrate.
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RE: Estimating flow depth in partially filled pipe.
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Robert Markoski - Project/Mechanical Engineer
wwww.RobertMarkoski.net/Engineering
RE: Estimating flow depth in partially filled pipe.
David
RE: Estimating flow depth in partially filled pipe.
RE: Estimating flow depth in partially filled pipe.
http://www.cispi.org/handbook/chapter8.pdf
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