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Experimental Investigation of the Evaporation and Stability of a Meniscus in a Flat Microchannel

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Original languageEnglish
Title of host publicationDIFFUSION IN SOLIDS AND LIQUIDS VI, PTS 1 AND 2
EditorsA Ochsner, GE Murch, JMP Delgado
Place of PublicationSTAFA-ZURICH
PublisherTRANS TECH PUBLICATIONS LTD
Pages1178-1183
Number of pages6
ISBN (Print)*****************
DOIs
Publication statusPublished - 2011
Event6th International Conference on Diffusion in Solids and Liquids - Paris
Duration: 5 Jul 20107 Jul 2010

Conference

Conference6th International Conference on Diffusion in Solids and Liquids
CityParis
Period5/07/107/07/10

Abstract

We present the results of an experimental investigation of the evaporation of a liquid meniscus in a high aspect ratio micro-channel. The study investigates evaporation rates of a stationary liquid meniscus in a high aspect ratio microchannel, the wall of which is electrically heated using transparent resistive coating. Four different liquids are used as working fluids. We report on the dependence of the measured overall evaporation rate on the applied power. The results indicate, and consistently, that the evaporation rate increases with the applied power then peaks before declining. In order to gain insight into these results, we used thermographic infra red imaging to map the temperature field on the external wall of the microchannel. The measurements show that there is a good correlation between the maximum in the evaporative rate and the onset of instabilities of the interface. These instabilities, to our mind, are induced by an increasing temperature gradient along the microchannel wall around the three phase contact line region. These instabilities are revealed by a high speed camera used to record the behaviour of the interface during evaporation.

    Research areas

  • three phase contact line, evaporation, stability

Event

ID: 1363136