Numerical Modelling of Transient Flow In Long Oil Pipe Line System
Engineering and Technology Journal,
2010, Volume 28, Issue 16, Pages 5346-5364
AbstractThe problem of unsteady flow are frequently encountered in long oil
pipelines without the provision of surge tank due to sudden closing or
opening of valve and pump trip. The oil-hammer are analyzed and
predicted by using the Eulerian approach (MOC) and the Lagrangian
approach (WCM). The investigation was carried out for sufficiently long
time to demonstrate changing of pressure head with time. Transient
conditions arising in long oil pipeline with pumping station, valve and
branches are studied in details for KRK pipeline by these two pproaches.
A Computer programs for all these components were developed.The effect of valve closure, line branch junction and pump shut-down are studied taking into account the effect of line friction on pressure wave. A
numerical model "UNSTEADY_ FRIC_WH" using MOC and Barr's explicit friction factor has been presented for solution of the transient flow
situation of water hammer. Assessment of friction factor at any section in this unsteady transient flow conditions clearly indicates the effectiveness of using variable friction factor in contrast to the steady state friction as in the available numerical models.
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