Drying drop on a substrate: The coffee stain effect
1832 views
10.06.2015
Co-author
Affiliation
Fraunhofer IWM, Fraiburg, Germany
Main category
Engineering (Chemical engineering)
Alternative category
Engineering (Mechanical engineering)
Caption
This video shows the drying of a silver ink micro droplet on a solid substrates. The simulation is carried out using the discrete element method (DEM) which is combined with an analytic solution of the fluid motion via one-way-coupling. For visualization of the patterns of solid sediment after drying, only the solid content of the nano-suspension (i.e. the silver particles) is shown. This method can be used e.g. to determine the optimum solid content for a given drop size and a desired sediment pattern (i.e. ring shaped vs fully covered).
Further information
Further reading
T. Breinlinger, T. Kraft, A simple method for simulating the coffee stain effect, Powder Technology, 256:279–284, 2014. (DOI:10.1016/j.powtec.2014.02.024)
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