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Journal Articles Indoor and Built Environment Year : 2020

On-site airflow measurement of a laboratory fume hood using customized large-scale image-based velocimetry

Abstract

This study demonstrates the feasibility of conducting on-site large-scale image-based measurements for indoor airflows characterisation. To illustrate the potential of our method, we chose to study the suction flow generated by a laboratory fume hood in operating conditions. As a matter of fact, laboratory fume hoods are frequently subject to routine checks during which air speed measurements by hot-wire ane- mometry are performed. However, classical point-to-point hot-wire anemometry may be not sufficient to detect and locate potential leakages. To improve these controls, we developed and tested a new method based on particle image velocimetry principles, which is non-intrusive and authorizes a good spatio-temporal analysis. To face large-scale and on-site issues, we had to make some adaptations. For this reason, we used tracers like bubbles or smoke which have good scattering properties. We also developed our own low-cost light system. To compute velocities from image sequences, we developed an optical flow algorithm based on a large-scale flow model instead of using traditional correlation. The tested method gave good results with a good agreement with sparse hot-wire anemometry measure- ments but with a wider spatial distribution. In addition, the method provided turbulence intensity esti- mation and a good monitoring of dynamic flow features, which is important for the detection of leakages.
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Dates and versions

hal-02419135 , version 1 (19-12-2019)

Identifiers

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Romain Schuster, Dominique Heitz, Philippe Georgeault, Etienne Mémin. On-site airflow measurement of a laboratory fume hood using customized large-scale image-based velocimetry. Indoor and Built Environment, 2020, 29 (6), pp.810-819. ⟨10.1177/1420326X19865928⟩. ⟨hal-02419135⟩
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