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Energy Transport by Thermocapillary Convection during Sessile-Water-Droplet Evaporation

2010; American Physical Society; Volume: 105; Issue: 13 Linguagem: Inglês

10.1103/physrevlett.105.136102

1092-0145

Hadi Ghasemi, C. A. Ward,

Innovative Microfluidic and Catalytic Techniques Innovation

The energy transport mechanisms of a sessile-water droplet evaporating steadily while maintained on a Cu substrate are compared. Buoyancy-driven convection is eliminated, but thermal conduction and thermocapillary convection are active. The dominant mode varies along the interface. Although neglected in previous studies, near the three-phase line, thermocapillary convection is by far the larger mode of energy transport, and this is the region where most of the droplet evaporation occurs.