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A ferrofluid-based sensor to measure bottom shear stresses under currents and waves

Cita com:
hdl:2117/117113
Document typeArticle
Defense date2018-02
Rights accessOpen Access
All rights reserved. This work is protected by the corresponding intellectual and industrial
property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public
communication or transformation of this work are prohibited without permission of the copyright holder
ProjectHYDRALAB IV - HYDRALAB IV More than water; dealing with the complex interaction of water with environmental elements, sediment, structures and ice (EC-FP7-261520)
HYDRALAB-PLUS - HYDRALAB+ Adapting to climate change (EC-H2020-654110)
HYDRALAB-PLUS - HYDRALAB+ Adapting to climate change (EC-H2020-654110)
Abstract
The measurement of the near-bottom flow characteristics is crucial to correctly understand coastal processes. To overcome some of the limits of present state-of-the-art measuring instruments, we propose a novel approach to measure bottom shear stress under currents and waves based on the exploitation of magneto-rheological fluids, named ferrofluids. In particular, the deformation of a magnetically controlled ferrofluid drop O(0.01 ml) is transformed by a conditioning circuit into an output voltage which is proportional to the bottom shear stress. Calibration curves are presented for both steady-current and regular wave conditions, over fixed and weakly mobile beds, showing that the behaviour of the proposed measuring system can be assumed linear. In the range of the investigated parameters, it is shown that the working range is comprised between 0.08 N m-2 and an upper limit which is a function of the controlling magnetic field and the flow type.
Description
This is an Accepted Manuscript of an article published by Taylor & Francis Group in Journal of Hydraulic Research on 2018, available online at: http://www.tandfonline.com/10.1080/00221686.2017.1397779
CitationMusumerci, R., Marletta, V., Sanchez-arcilla, A., Foti, E. A ferrofluid-based sensor to measure bottom shear stresses under currents and waves. "Journal of hydraulic research", Febrer 2018, vol. 56, núm. 5, p. 630-647.
ISSN0022-1686
Publisher versionhttps://www.tandfonline.com/doi/abs/10.1080/00221686.2017.1397779
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