A researcher advised me that the flow in a packed (pressurized) gasoline pipeline won't be streamlined but like channel flow, to which I partly agree
Two phase flow with potential turbulence at liquid gas interfaces. Bubbles breaking for any pressure drops creating instabilities is another headache. Not to mention "vibration" -but he is ruled by the king called Velocity. All said if the velocities are within some API limits you are laughing..!!
I dont anticipate any issues with such low velocity, however I am not sure of the KE (rhoxv2) limit for gasoline. Neverthless, I would believe that the pipleline can absorb the enregy and should not give you any integrity problems.
So you believe it should be a streamlined flow? the flow is turbulent throughout, not only at the interface. Actually going by the Moody's diagram it rather lies in the transient flow regime, if friction factor is calculated from Darcy-Weisbach equation.
Going by some books, Schaum's outline on hydraulics, there should not be any channel-like flow, but how practical the cases discussed therein are, is doubtful now. what u say?
12'' tube is so large the real flow will be turbulent everywhere, of course. But I'm not sure about the interface behavior. It really depends on phases volume fraction. The first idea in my mind is foamy interface when the vapour and liquid fractions commensurate each other. Otherwise, the vapour just should form localized bubbles mixed in flow. High-turbulent flow will make them smaller and smaller until surface tension is not enough to prevent it, and the small bubbles distributed almost uniformly in tube should travel with flow.
Kirill sir. I have analysed the behaviour of interface from SCADA mapping. The interface shows gradual increase/decrease in density,say from 790 to 840 kg/cum within 30 minutes. But there is no variation/fluctuation in pressure across the interface. The absence of pressure fluctuation across interface suggests that foam/bubbles shouldn't be there. What you say?
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