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Tests of a fiber-optic velocity transducer

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Abstract

A novel transducer is developed and tested. The transducer utilizes optical fiber to measure mean and instantaneous flow rates in turbulent flows, and is capable of detecting flow reversal. Calibration of the transducer is conducted in both air and water. The dynamic response of the transducer is tested against hot-wire anemometery in the wake flow of a circular cylinder over a wide range of Reynolds number.

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Abbreviations

C D :

drag coefficient

D :

diameter of cylinder

d :

diameter of fiber

E :

modulus of elasticity of the fiber

e :

output voltage

F :

drag force per unit length of a cylinder

f :

frequency (Hz)

L :

length of the “fiber” cantilever

M :

magnification factor

m :

mass per unit length of the fiber

Re :

Reynolds number

q :

dynamic pressure (= 1/2 ϱU 2)

U :

free stream velocity

ϱ:

density

v :

kinematic viscosity

References

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Authors and Affiliations

  1. Department of Aerospace Engineering and Engineering Mechanics, San Diego State University, 92182, San Diego, CA, USA

    N. S. Nosseir & B. Dagan

Authors
  1. N. S. Nosseir
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  2. B. Dagan
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Nosseir, N.S., Dagan, B. Tests of a fiber-optic velocity transducer. Experiments in Fluids 3, 239–243 (1985). https://doi.org/10.1007/BF00265107

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  • DOI: https://doi.org/10.1007/BF00265107

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