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Title

Fiber Bragg grating tether used to measure drag forces in neutral buoyancy flow tank tests

Author(s)

Wade, S. A.;  Jolley, W.;  Fouras, A.

Abstract

The drag exerted on neutrally buoyant tethered spheres in a flow tank was measured as a function of flow rate. A unique solution to the problem was achieved using an optical fiber including a Bragg grating sensor as part of the tether. Measurements of the strain on the tether taken at flow rates between 0.14 and 0.33 m/s, were used to determine drag forces for spheres with diameters ranging from 40 to 100 mm. Vortex-induced vibration was observed in tests performed at Reynolds numbers from 5×103 to 4.5×104. The drag coefficients for these tests were found to range from 0.51 to 0.77.

Publication type

Journal article

Source

Review of Scientific Instruments, Vol. 79, no. 6 (Jun 2008), article no. 065102

Publication year

2008

FOR Code(s)

0299 Other Physical Sciences;  0304 Medicinal and Biomolecular Chemistry;  0915 Interdisciplinary Engineering

Keyword(s)

Buoyancy;  Drag forces;  Fibre Bragg grating;  Flow rates;  Flow tanks

Publisher

American Institute of Physics

ISSN

0034-6748

Publisher URL

http://dx.doi.org/10.1063/1.2937457

Copyright

Copyright © 2008 American Institute of Physics. Published version of this paper reproduced here with the kind permission of the publisher.

Full text

Peer reviewed