The strong influence of substrate conductivity on droplet evaporation

We report the results of physical experiments that demonstrate the strong influence of the thermal conductivity of the substrate on the evaporation of a pinned droplet. We show that this behaviour can be captured by a mathematical model including the variation of the saturation concentration with te...

Full description

Saved in:

Bibliographic Details
Published in:	Journal of fluid mechanics 2009-03, Vol.623, p.329-351
Main Authors:	DUNN, G. J., WILSON, S. K., DUFFY, B. R., DAVID, S., SEFIANE, K.
Format:	Article
Language:	eng
Subjects:	Atmosphere Condensed matter: structure, mechanical and thermal properties Conductivity Evaporation Exact sciences and technology Fluid dynamics Physics Solid-fluid interfaces Substrates Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties) Wetting
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	We report the results of physical experiments that demonstrate the strong influence of the thermal conductivity of the substrate on the evaporation of a pinned droplet. We show that this behaviour can be captured by a mathematical model including the variation of the saturation concentration with temperature, and hence coupling the problems for the vapour concentration in the atmosphere and the temperature in the liquid and the substrate. Furthermore, we show that including two ad hoc improvements to the model, namely a Newton's law of cooling on the unwetted surface of the substrate and the buoyancy of water vapour in the atmosphere, give excellent quantitative agreement for all of the combinations of liquid and substrate considered.
ISSN:	0022-1120 1469-7645