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We investigate numerically quasi-steady internal flows in an axiallysymmetrical evaporating sessile droplet depending on the ratio of substrate tofluid thermal conductivities, fluid volatility, contact angle and droplet size.Temperature distributions and vortex structures are obtained for droplets of1-hexanol, 1-butanol and ethanol. To this purpose, the hydrodynamics of anevaporating sessile drop, effects of the thermal conduction in the droplet andsubstrate and diffusion of vapor in air have been jointly taken into account.The equations have been solved by finite element method using ANSYS Fluent. Thephase diagrams demonstrating the number and orientation of the vortices asfunctions of the contact angle and the ratio of substrate to fluid thermalconductivities, are obtained and analyzed for various values of parameters. Inparticular, influence of gravity on the droplet shape and the effect of dropletsize have been considered. We have found that the phase diagrams of highlyvolatile droplets do not contain a subregion corresponding to a reversed singlevortex, and their single-vortex subregion becomes more complex. The phasediagrams for droplets of larger size do not contian subregions corresponding toa regular single vortex and to three vortices. We demonstrate how thesingle-vortex subregion disappears with a gradual increase of the droplet size.

Fluid flow structures in an evaporating sessile droplet depending on the droplet size and properties of liquid and substrate