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Interfacial Phenomena and Heat Transfer
ESCI

ISSN Imprimir: 2169-2785
ISSN On-line: 2167-857X

Open Access

Interfacial Phenomena and Heat Transfer

DOI: 10.1615/InterfacPhenomHeatTransfer.2016012352
pages 221-229

BEYOND TANNER'S LAW: ROLE OF CONTACT LINE EVAPORATION ON THE SPREADING OF VISCOUS DROPLET

Wassim Bou-Zeid
Aix Marseille University, CNRS, IUSTI UMR 7343, 13013, Marseille, France
David Brutin
Aix Marseille University, CNRS, IUSTI UMR 7343, 13013, Marseille, France; Institut Universitaire de France, 75231 Paris, France

RESUMO

The effect of relative humidity and viscosity on the spreading dynamics of water-glycerol mixtures was analyzed for a range of humidities from 20% to 80%. Droplets of identical volume were deposited on ultra-clean glass substrates. We demonstrated that, in addition to the competition between viscous forces, capillary forces, and disjoining pressure, droplet spreading was also affected by the evaporation that occurred at the triple line. We provide an updated Tanner's spreading law, which was modified to take into account the evaporative contribution. The same mechanism can be applied to adjust any fluid to Tanner's coefficient of 1/10.


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