Evaporation of a thin droplet in a shallow well: theory and experiment

D'Ambrosio, Hannah-May and Colosimo, Teresa and Duffy, Brian R. and Wilson, Stephen K. and Yang, Lisong and Bain, Colin D. and Walker, Daniel E. (2021) Evaporation of a thin droplet in a shallow well: theory and experiment. Journal of Fluid Mechanics, 927. A43. ISSN 1469-7645 (https://doi.org/10.1017/jfm.2021.772)

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Motivated by the industrial manufacture of organic light-emitting-diode displays, we formulate and analyse a mathematical model for the evolution of a thin droplet in a shallow axisymmetric well of rather general shape both before and after touchdown that accounts for the spatially non-uniform evaporation of the fluid, perform physical experiments using three cylindrical wells with different small aspect ratios, and validate the mathematical model by comparing the present experimental results with the corresponding theoretical predictions for a cylindrical well.