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Sensors 2017, 17(11), 2466; https://doi.org/10.3390/s17112466

Determination of Fluid Density and Viscosity by Analyzing Flexural Wave Propagations on the Vibrating Micro-Cantilever

1
Department of Mechanical Engineering, Hanyang University, Seoul 04763, Korea
2
Department of Mechanical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea
These two authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 19 September 2017 / Revised: 16 October 2017 / Accepted: 24 October 2017 / Published: 27 October 2017
(This article belongs to the Section Physical Sensors)
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Abstract

The determination of fluid density and viscosity using most cantilever-based sensors is based on changes in resonant frequency and peak width. Here, we present a wave propagation analysis using piezoelectrically excited micro-cantilevers under distributed fluid loading. The standing wave shapes of microscale-thickness cantilevers partially immersed in liquids (water, 25% glycerol, and acetone), and nanoscale-thickness microfabricated cantilevers fully immersed in gases (air at three different pressures, carbon dioxide, and nitrogen) were investigated to identify the effects of fluid-structure interactions to thus determine the fluid properties. This measurement method was validated by comparing with the known fluid properties, which agreed well with the measurements. The relative differences for the liquids were less than 4.8% for the densities and 3.1% for the viscosities, and those for the gases were less than 6.7% for the densities and 7.3% for the viscosities, showing better agreements in liquids than in gases. View Full-Text
Keywords: density; viscosity; wave propagation analysis; cantilever sensor; fluid-structure interaction density; viscosity; wave propagation analysis; cantilever sensor; fluid-structure interaction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kim, D.; Hong, S.; Jang, J.; Park, J. Determination of Fluid Density and Viscosity by Analyzing Flexural Wave Propagations on the Vibrating Micro-Cantilever. Sensors 2017, 17, 2466.

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