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Journal of Sensors and Sensor Systems An open-access peer-reviewed journal
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Volume 4, issue 1
J. Sens. Sens. Syst., 4, 239–247, 2015
https://doi.org/10.5194/jsss-4-239-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
J. Sens. Sens. Syst., 4, 239–247, 2015
https://doi.org/10.5194/jsss-4-239-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular research article 18 Jun 2015

Regular research article | 18 Jun 2015

Novel microthermal sensor principle for determining the mixture ratio of binary fluid mixtures using Föppl vortices

B. Schmitt1, C. Kiefer*,1, and A. Schütze1 B. Schmitt et al.
  • 1Laboratory for Measurement Technology, Saarbrücken, Germany
  • *now at: Chair of Micromechanics, Microfluidics/Microactuators, Saarbrücken, Germany

Abstract. A novel sensor principle for determining binary fluid mixtures of known components is presented, making use of different thermal and rheological properties of the mixture's components. Using a microheater, a heat pulse is introduced in the mixture. The resulting temperature increase depends on the thermal properties of the mixture, allowing determination of the mixture ratio. Placing a bluff body in the fluid channel causes the formation of a stationary pair of vortices behind the body. The length of the vortex pair depends on the mixture's viscosity and thus its composition. By placing the microheater in the vortex area and making use of forced convection which changes with the size of the vortex, the sensitivity for determination of the mixture ratio can be increased by a factor of 2.5 compared to the direct thermal measurement. The flow velocity is measured independently of the mixture ratio using time-of-flight thermal anemometry.

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A novel sensor principle for determining binary fluid mixtures of known components is presented. A bluff body is placed in the fluid channel, causing the formation of a stationary pair of vortices behind the body. The length of the vortex pair depends on the mixture’s viscosity and thus its composition. It is measured by placing a microheater in the vortex area and making use of forced convection which changes with the size of the vortices.
A novel sensor principle for determining binary fluid mixtures of known components is presented....
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