76th Annual Meeting of the APS Division of Fluid Dynamics (November 19, 2023 — November 21, 2023)

P0023: Mocha Diffusion: the art of spreading miscible liquids

  • Tabitha Watson, Emory University
  • Justin Burton, Emory University
DOI: https://doi.org/10.1103/APS.DFD.2023.GFM.P0023

Dye solutions deposited on miscible viscous sub-fluids produce radial, fern-like patterns known as mocha diffusion. There are many different ways to design mocha diffusion art, but Marangoni forces and a sub-fluid viscosity that rapidly changes with water content are key ingredients. Pictured are beautiful diffusion patterns produced by a variety of dye solution and sub-fluid combinations.

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