can i ask u something what type of fluid are u talking about and did u take the various friction factors into considerations Interesting - so Beggs&Brill apparently doesn't properly predict the flow regime / slugging in the riser? Three out of four correlations suggest the second curve is right, but I'm a little cautious about going with the "unusual" behaviour.Ĭan anyone here shed any light on this odd behaviour? Nearest I can figure out, I've somehow exceeded the validity range of the mechanistic correlations, or else there's a mechanism other than deposition and entrainment going on which kills off the holdup at low flowrates. The odd thing is that using three standard mechanistic correlations (Olga, Shell and Ainsley), I'm getting the second curve, but if I use the default Pipesim correlation (Beggs and Brill revised), I get the first curve. In the problematic case (which is a gas-condensate case with little liquid and low gas flowrates), I'm seeing the second sort of curve, which is low at the start, high in the middle, and low at the end. ![]() In general, I'd expect my curves to look like the first one in this uploaded file - large holdup at low flowrates, and low holdup at low flowrates, following an asymptotic-like decay. I've been doing some pipeline modelling in PipeSim recently, and I've found a really puzzling holdup-vs-flow curve, which runs counter to every other holdup-vs-flow curve I've seen before.
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