Polymer Induced Drag Reduction in a Turbulent Pipe Flow Subjected to a Coriolis Force

被引：0
作者：
P. Shoeibi Omrani
R. Delfos
B. J. Boersma
机构：
[1] Delft University of Technology,Laboratory for Energy Technology, Mechanical Engineering Faculty
[2] Delft University of Technology,Laboratory for Aero
来源：
Flow, Turbulence and Combustion | 2012年 / 89卷
关键词：
Drag reduction; Turbulent pipe flow; Polymer; Coriolis force;
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摘要：
The skin friction factor f in a turbulent wall-bounded flow can be greatly reduced by using polymer solutions. In this paper we discuss experimental results on the effect of the Coriolis force on turbulent drag reduction. To study this, a horizontal smooth-walled pipe with internal diameter 25 mm is placed on a horizontal table rotating about its vertical axis. The rotation is made non-dimensional with friction velocity and pipe diameter, to form the Rotation number Ro. For a range of bulk Rotation number (Rob) between 0 and 0.6 for two different Reynolds numbers (Reb = 15 & 30 × 103), the pressure drop is measured, from which the average friction factor f is obtained. Additionally the effect of four different polymer concentrations has been investigated. The single-phase results show that the friction factor increases monotonic but gradual with Rotation. With polymer additives a drag reduction is found that increases with concentration, but which is not affected by the rotation.
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页码：589 / 599
页数：10
相关论文
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  • [1] Toms B(1948)Observation on the flow of linear polymer solutions through straight tubes at large Reynolds number Proc. Int. Rheological Congress 2 131-141
  • [2] Burger ED(1982)Flow increase in the Trans Alaska Pipeline through use of a polymeric drag-reducing additive J. Pet. Technol. 34 377-386
  • [3] Munk WR(1975)Drag reduction fundamentals AICHE J. 21 625-656
  • [4] Wahl HA(1967)The Toms-phenomenon: turbulent pipe flow of dilute polymer solutions J. Fluid Mech. 30 305-328
  • [5] Virk PS(1991)Drag reduction effect of rod-like polymer solutions J. Phys. Soc. 60 868-878
  • [6] Virk PS(1973)Drag reduction in turbulent flow by polymer additives J. Polym. Sci. 7 263-290
  • [7] Merrill EW(2003)Turbulent channel flow near maximum drag reduction: simulations, experiments and mechanisms J. Fluid Mech. 490 251-291
  • [8] Mickley HS(1972)Velocity measurements made with a laser Dopplermeter on the turbulent pipe flow of a dilute polymer solution J. Fluid Mech. 51 673-182
  • [9] Smith KA(2001)Experiments in turbulent pipe flow with polymer additives at maximum drag reduction Flow Turbul. Combust. 66 159-552
  • [10] Mollo-Christensen EL(2008)Comparison of theory and direct numerical simulations of drag reduction by rodlike polymers in turbulent channel flows Phys. Rev. E 77 046309-522
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