Particle and Aerosol Research Vol. 9, No. 4, December 2013 |
ISSN : 1738-8716 (Print) ISSN : 2287-8130 (Online) |
Drag Reduction Induced by Increased Kinematic Viscosity of Nanofluids Containing Carbon Nanotubes in A Horizontal Tube
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Abstracts
This article reports the drag reduction phenomenon of aqueous suspensions containing carbon nanotubes (CNTs)
flowing through horizontal tubes. Stable nanofluids were prepared by using a surfactant. It is found that the drag
forces of CNT nanofluids were reduced at specific flow conditions compared to the base fluid. It is found that the
friction factor of CNT nanofluids was reduced up to approximately 30 % by using CNT nanofluids. Increased
kinematic viscosities of CNT nanofluids are suggested to the key factors that cause the drag reduction phenomenon.
In addition, transition from laminar to turbulent flow is observed to be delayed when CNT nanofluids flow in a
horizontal tube, meaning that drag reduction occurs at higher flow rates, that is, at higher Reynolds numbers.
Keywords£ºNanofluids, Carbon nanotube, Drag, Kinematic viscosity, Reynolds number
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