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16:30
15 mins
The reorganisation of turbulent pipe flow by a drag-reducing polymer additive
David Dennis, Francesca Sogaro
Session: Multiphase and non-Newtonian flows 3
Session starts: Thursday 27 August, 15:00
Presentation starts: 16:30
Room: Room D
David Dennis (University of Liverpool)
Francesca Sogaro (Imperial College London)
Abstract:
The effect of a drag-reducing polymer additive on the organisational states of turbulent pipe flow is investigated by performing stereoscopic particle image velocimetry measurements in a large-scale pipe flow experiment at $Re_D=10000$ using both water and a visco-elastic, shear-thinning, semi-dilute aqueous polymer solution. The effect of the polymer is to decrease the drag (by 62\%) whilst significantly increasing the probability that the flow exists in a flow state with a low azimuthal wavenumber ($k_\theta=2$). This result indicates that the $k_\theta=2$ state is potentially a favourable (i.e.~low drag) flow state.