Abstract
Patterns related to the flow structure in the sessile droplet and its surrounding air–vapor environment could reveal the leading mechanisms that drive the various instabilities observed and explain the dynamical regimes that take place in the course of evaporation. Therefore, this chapter presents some state-of-the-art methods and algorithms that can help us to better understand the various flow instabilities observed in evaporating sessile droplets. Although it is obviously a transient phenomenon, have chosen as first approach a frozen-time technique associated with a one-sided model to study the flow structure sensitivity of the evaporation rate in order to study its related bifurcation diagram. Then, a two-sided and unsteady model is used to investigate highly nonlinear regimes associated with high evaporation rates. The approaches we followed in this study are first presented, and the obtained results and their limits are then discussed. It turns out that the physically refined models can be used to reproduce and investigate most of the triggering mechanisms of the flow instabilities that take place during the evaporation process of a sessile droplet.
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