Edinburgh Research Explorer

Experimental investigation of the effect of the ambient gas on evaporating sessile drops

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Related Edinburgh Organisations

Original languageEnglish
Title of host publicationDiffusion in Solids and Liquids
EditorsA Ochsner, J Gracio
Place of PublicationSTAFA-ZURICH
PublisherTRANS TECH PUBLICATIONS LTD
Pages461-468
Number of pages8
ISBN (Print)*************
Publication statusPublished - 2006
Event2nd International Conference on Diffusion in Solids and Liquids - Aveiro, Portugal
Duration: 26 Jul 200628 Jul 2006

Publication series

NameDEFECT AND DIFFUSION FORUM
PublisherTRANS TECH PUBLICATIONS LTD
Volume258-260
ISSN (Print)1012-0386

Conference

Conference2nd International Conference on Diffusion in Solids and Liquids
CountryPortugal
Period26/07/0628/07/06

Abstract

This paper presents the results of an experimental study of evaporating sessile drops in a controlled environment. The experimental setup allowed the investigation of the evaporation rate of sessile drops under reduced pressure (40 to 1000 mbar) and various ambient gases. Sessile drops of initial volume 2.5 mu L are deposited on substrates and left to evaporate in a controlled atmosphere. The effect of reducing pressure on the evaporation rate as well as changing the ambient gas is studied. Three different gases are used; namely Helium, Nitrogen and Carbon Dioxide. The role of vapour diffusion as a limiting mechanism for evaporation is studied. It is found that in all cases the evaporation rate is limited by the mass diffusion in the ambient gas provided that interfacial conditions are properly accounted for. This includes important evaporative cooling observed at higher evaporation rates and lower substrate thermal conductivity.

    Research areas

  • contact angle, evaporation, diffusion, sessile drops, DROPLETS

Event

2nd International Conference on Diffusion in Solids and Liquids

26/07/0628/07/06

Portugal

Event: Conference

ID: 18086706