- Journal Article
Rights / licenseIn Copyright - Non-Commercial Use Permitted
An aqueous solution of sodium iodide and zinc iodide is proposed as a fluid that matches the refractive index of a solid manufactured by rapid prototyping. This enabled optical measurements in single-phase flow through porous structures. Experiments were also done with an organic index-matching fluid (anisole) in porous structures of different dimensions. To compare experiments with different viscosities and dimensions, we employed Reynolds similarity to deduce the scaling laws. One of the target quantities of our investigation was the dissipation rate of turbulent kinetic energy. Different models for the dissipation rate estimation were evaluated by comparing isotropy ratios. As in many other studies also, our experiments were not capable of resolving the velocity field down to the Kolmogorov length scale, and therefore, the dissipation rate has to be considered as underestimated. This is visible in experiments of different relative resolutions. However, being near the Kolmogorov scale allows estimating a reproducible, yet underestimated spatial distribution of dissipation rate inside the porous structure. Based on these results, the k−ε Show more
Journal / seriesExperiments in Fluids
Pages / Article No.
SubjectReynolds Number; Particle Image Velocimetry; Turbulent Kinetic Energy; Dissipation Rate; Turbulent Diffusivity
Organisational unit03348 - Rudolf von Rohr, Philipp (emeritus) / Rudolf von Rohr, Philipp (emeritus)
NotesIt was possible to publish this article open access thanks to a Swiss National Licence with the publisher.
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