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Diffusion-evaporation studies of binary mixtures in capillary tubes

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Original languageEnglish
Title of host publicationDIFFUSION IN SOLIDS AND LIQUIDS III
EditorsA Ochsner, GE Murch
Place of PublicationSTAFA-ZURICH
PublisherTRANS TECH PUBLICATIONS LTD
Pages577-582
Number of pages6
ISBN (Print)*****************
Publication statusPublished - 2008
Event3rd International Conference on Diffusion in Solids and Liquids - Algarve, Portugal
Duration: 4 Jul 20076 Jul 2007

Publication series

NameDefect and Diffusion Forum
PublisherTRANS TECH PUBLICATIONS LTD
Volume273-276
ISSN (Print)1012-0386

Conference

Conference3rd International Conference on Diffusion in Solids and Liquids
CountryPortugal
Period4/07/076/07/07

Abstract

Evaporation in restricted domains, e.g. in capillaries, is of industrial importance but is poorly understood. Where the evaporating liquid is a binary mixture, preferential evaporation of the more volatile component occurs initially and the evaporation rate is not constant, indeed it appears to occur in stages. Experiments of evaporation from the entrance of a capillary were performed for various binary mixtures of acetone and water and for pure liquids for comparison. Measurements of mass were taken over time for a range of capillary diameters from 0.6 mm to 2 mm. For simplicity, the experiments were performed with the meniscus "stationary" at the entrance of the tube, rather than allowing the meniscus to recede. The data were analysed and showed that, for the binary mixtures, the evaporation process had two distinct stages for the mixtures. The second stage always had a lower slope than the first, indicating a slower evaporation (similar multistage evaporation processes have been observed for sessile drops of binary mixtures). There are many phenomena at work in this process: surface evaporation; diffusion (or natural convective mass transfer) in the air beyond the capillary; diffusion in the binary mixture; circulation in the liquid; thermal effects of evaporative cooling. These are investigated, comparisons made and further studies are proposed.

    Research areas

  • evaporation, diffusion, capillary, binary, HEAT-TRANSFER, MENISCUS, LIQUID, FILM

Event

3rd International Conference on Diffusion in Solids and Liquids

4/07/076/07/07

Portugal

Event: Conference

ID: 18086347