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An optical method of rendering fluid flow patterns visible by using index-of-refraction differences in the flow. As a simple example, sunlight...


= Encyclopedia Article; = Research Update
Figure 1.Schematic of the shadowgraph method applied to reveal convection patterns in a fluid layer. A cross section of the apparatus perpendicular to the convection rolls is shown.
From Encyclopedia article 'Shadowgraph'
Figure 2.Background-divided shadowgraph image of convection in high-pressure carbon dioxide gas. The convection rolls are in the form of a two-armed spiral lying within a set of concentric circular rolls. (From E. Bodenschatz et al., Transitions between patterns in thermal convection, Phys. Rev. Lett., 67:3078–3081, 1991)
From Encyclopedia article 'Shadowgraph'
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