On the predictions for diffusion-driven evaporation of sessile droplets with interface cooling. (23rd February 2018)

• Record Type: Journal Article
• Authors: Tran, Ha V.; Nguyen, Tuan A.H.; Biggs, Simon R.; Nguyen, Anh V.
• Is Part Of: Chemical engineering science. Volume 177(2018)
• Page Start: 417
• Page End: 421
• Publication Date: 2018-02-23
• Subjects: Coffee ring -- Contact angle -- Flux -- Toroidal coordinate -- Laplace equation; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2017.12.003
• Languages: English
• ISSNs: 0009-2509

Abstract

Graphical abstract: Highlights: Evaporation changes temperature and vapour density at sessile droplet interfaces. New predictions for interface vapour density and evaporative flux are obtained. New predictions reduce to classical models if interface cooling is negligible. Comparison with the literature data shows significant effects of interface cooling. Abstract: The diffusion-driven evaporation of sessile droplets from planar surfaces is influenced by cooling at the air-liquid interface. Here, corrections to the available models for predicting the evaporation process are presented. The mass conservation for diffusion-driven evaporation is resolved by considering the effect of interface cooling on the change in density of saturated vapour along the liquid-vapour interface of sessile droplets. Corrections to the predictions for the spatial distribution of vapour density around a sessile droplet and the evaporative flux of vapour at the interface are obtained. The classical models are recovered from the new predictions if interface cooling is negligible. Comparison between the new and classical predictions for the local surface evaporative flux is obtained using the literature data. Our analysis shows a significant effect of interface cooling which should be considered in predicting diffusion-driven evaporation of sessile droplets on planar surfaces.