Displacement flows of viscoplastic fluids in an oscillating pipe

Abstract eng:
We study experimentally the displacement flow of a Viscoplastic fluid by a Newtonian fluid in a vertical pipe. The two fluids have a small density difference (i.e., 2%). The denser displacing fluid is placed above the displaced fluid. Although buoyancy is a driving force, there is also an imposed flow (from the top of the pipe) with a mean velocity V0. We have considered two different situations: first, the pipe is stationary; second, the pipe slowly oscillates around its vertical position like an inverted pendulum. Considering displacement flows at different imposed flow rates in stationary and moving pipes, we find that at low imposed flows the displacement flow in a moving pipe is less efficient. This may have a negative impact in floating production storage and offloading (FPSO) applications, where displacement flows in moving geometry occurs.

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