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Schlieren technique in soap film flows

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Abstract

We propose the use of the Schlieren technique as a tool to analyse the flows in soap film tunnels. The technique enables to visualize perturbations of the film produced by the interposition of an object in the flow. The variations of intensity of the image are produced as a consequence of the deviations of the light beam traversing the deformed surfaces of the film. The quality of the Schlieren image is compared to images produced by the conventional interferometric technique. The analysis of Schlieren images of a cylinder wake flow indicates that this technique enables an easy visualization of vortex centers. Post-processing of series of two successive images of a grid turbulent flow with a dense motion estimator is used to derive the velocity fields. The results obtained with this self-seeded flow show good agreement with the statistical properties of the 2D turbulent flows reported on the literature.

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Authors and Affiliations

  1. Laboratorio de Fluidodinámica, Facultad de Ingeniería, Universidad de Buenos Aires, CONICET, Av. Paseo Colón 850, C1063ACV, Buenos Aires, Argentina

    M. I. Auliel, F. Castro Hebrero, R. Sosa & G. Artana

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  1. M. I. Auliel
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  2. F. Castro Hebrero
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  3. R. Sosa
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  4. G. Artana
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Correspondence to M. I. Auliel.

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Auliel, M.I., Hebrero, F.C., Sosa, R. et al. Schlieren technique in soap film flows. Exp Fluids 58, 38 (2017). https://doi.org/10.1007/s00348-017-2311-4

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  • DOI: https://doi.org/10.1007/s00348-017-2311-4

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