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Polymers and Plastrons in Parallel Yield Enhanced Turbulent Drag Reduction

Hatsopoulos Microfluids Laboratory, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
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Fluids 2020, 5(4), 197; https://doi.org/10.3390/fluids5040197
Received: 13 October 2020 / Revised: 27 October 2020 / Accepted: 29 October 2020 / Published: 1 November 2020
(This article belongs to the Special Issue Feature Papers in Fluids)
Despite polymer additives and superhydrophobic walls being well known as stand-alone methods for frictional drag reduction in turbulent flows, the possibility of employing them simultaneously in an additive fashion has remained essentially unexplored. Through experimental friction measurements in turbulent Taylor–Couette flow, we show that the two techniques may indeed be combined favorably to generate enhanced levels of frictional drag reduction in wall-bounded turbulence. We further propose an additive expression in Prandtl–von Kármán variables that enables us to quantitatively estimate the magnitude of this cooperative drag reduction effect for small concentrations of dissolved polymer. View Full-Text
Keywords: drag reduction; polymers; superhydrophobic surfaces; Taylor–Couette turbulence drag reduction; polymers; superhydrophobic surfaces; Taylor–Couette turbulence
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MDPI and ACS Style

Rajappan, A.; McKinley, G.H. Polymers and Plastrons in Parallel Yield Enhanced Turbulent Drag Reduction. Fluids 2020, 5, 197. https://doi.org/10.3390/fluids5040197

AMA Style

Rajappan A, McKinley GH. Polymers and Plastrons in Parallel Yield Enhanced Turbulent Drag Reduction. Fluids. 2020; 5(4):197. https://doi.org/10.3390/fluids5040197

Chicago/Turabian Style

Rajappan, Anoop; McKinley, Gareth H. 2020. "Polymers and Plastrons in Parallel Yield Enhanced Turbulent Drag Reduction" Fluids 5, no. 4: 197. https://doi.org/10.3390/fluids5040197

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