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
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Revised: 27 October 2020
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Accepted: 29 October 2020
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Published: 1 November 2020
(This article belongs to the Special Issue Recent Advances in Fluid Mechanics: Feature Papers)
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.
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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 StyleRajappan, Anoop, and Gareth H. McKinley. 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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