72th Annual Meeting of the APS Division of Fluid Dynamics (November 23, 2019 — November 26, 2019)

P0006: Immiscible Fluids in Thin Enclosure and Shadowgraph

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Authors

• Said Shakerin, Department of Mechanical Engineering, University of the Pacific

DOI: https://doi.org/10.1103/APS.DFD.2019.GFM.P0006

A thin (1.6 mm spacing) clear acrylic enclosure contains approximately equal volumes of glycerin and mineral oil, and a layer of air. Upon turning the enclosure upside down, a complex interaction between the three immiscible fluids is initiated. It is difficult to observe the interaction among the clear fluids. However, by shining flash light of a smart phone through the enclosure, shadows at the fluids’ interfaces are formed and projected on a screen behind the enclosure. The shadows form because light beam is refracted due to different indices of refraction among the fluids. The clear fluids were purposefully not colored so as to rely on shadowgraphs. The screen is simply a hung, rolled out sheet of large white paper tucked under the base holding the enclosure.