Intensification of heat transfer during evaporation of a falling liquid film in vertical microchannels-Experimental investigations
Identifieur interne : 000731 ( Hal/Checkpoint ); précédent : 000730; suivant : 000732Intensification of heat transfer during evaporation of a falling liquid film in vertical microchannels-Experimental investigations
Auteurs : Hubert Monnier [France] ; Jean-François Portha [France] ; Abdoulaye Kane [France] ; Laurent Falk [France]Source :
- Chemical Engineering Science [ 0009-2509 ] ; 2012-06-18.
English descriptors
Abstract
he aim of this article is to show the different boiling heat transfer regimes identified by Nukiyama (1934) in a micro-exchanger during a falling film evaporation. This study allows establishing operating conditions to develop the micro-evaporation or the micro-distillation where heat transfer has to be intensified. Indeed, the behaviour of binary mixtures on heat transfer is sometimes different than with a pure compound. The present study investigates the evaporation of ethanol in a sandwich plate micro-heat exchanger. Ethanol is a chemical test. It streams by gravity in falling film on two symmetrical heated micro-structured plates where micro-straight vertical channels have been machined (Kane et al., 2011). Electrical heat fluxes ranged from 2 to 5 kW/m(2). Various differences of temperatures between wall and saturation temperature were tested. Feed flow rate ranged between 1 and 5 g/min (smooth laminar flow: 2
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DOI: 10.1016/j.ces.2012.03.008
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<profileDesc><textClass><keywords scheme="mix" xml:lang="en"><term>Confined-bubble</term>
<term>Evaporation</term>
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<term>Heat transfer</term>
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<front><div type="abstract" xml:lang="en">he aim of this article is to show the different boiling heat transfer regimes identified by Nukiyama (1934) in a micro-exchanger during a falling film evaporation. This study allows establishing operating conditions to develop the micro-evaporation or the micro-distillation where heat transfer has to be intensified. Indeed, the behaviour of binary mixtures on heat transfer is sometimes different than with a pure compound. The present study investigates the evaporation of ethanol in a sandwich plate micro-heat exchanger. Ethanol is a chemical test. It streams by gravity in falling film on two symmetrical heated micro-structured plates where micro-straight vertical channels have been machined (Kane et al., 2011). Electrical heat fluxes ranged from 2 to 5 kW/m(2). Various differences of temperatures between wall and saturation temperature were tested. Feed flow rate ranged between 1 and 5 g/min (smooth laminar flow: 2</div>
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<hal api="V3"><titleStmt><title xml:lang="en">Intensification of heat transfer during evaporation of a falling liquid film in vertical microchannels-Experimental investigations</title>
<author role="crp"><persName><forename type="first">Hubert</forename>
<surname>Monnier</surname>
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<email>hubert.monnier@inrs.fr</email>
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<author role="aut"><persName><forename type="first">Jean-François</forename>
<surname>Portha</surname>
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<email>jean-francois.portha@univ-lorraine.fr</email>
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<author role="aut"><persName><forename type="first">Abdoulaye</forename>
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<idno type="halauthor">806662</idno>
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<author role="aut"><persName><forename type="first">Laurent</forename>
<surname>Falk</surname>
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<email>laurent.falk@univ-lorraine.fr</email>
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<editor role="depositor"><persName><forename>Gabriel</forename>
<surname>Wild</surname>
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<email>gabriel.wild@univ-lorraine.fr</email>
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<funder>CNRS Région Lorraine CPER (MEPP 13)</funder>
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<date type="whenWritten">2012</date>
<date type="whenModified">2016-05-11 01:05:35</date>
<date type="whenReleased">2013-01-17 10:49:24</date>
<date type="whenProduced">2012-06-18</date>
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<biblScope unit="pp">52-166</biblScope>
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<textClass><keywords scheme="author"><term xml:lang="en">ntensification</term>
<term xml:lang="en">Microdistillation</term>
<term xml:lang="en">Falling film</term>
<term xml:lang="en">Heat transfer</term>
<term xml:lang="en">Evaporation</term>
<term xml:lang="en">Confined-bubble</term>
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<abstract xml:lang="en">he aim of this article is to show the different boiling heat transfer regimes identified by Nukiyama (1934) in a micro-exchanger during a falling film evaporation. This study allows establishing operating conditions to develop the micro-evaporation or the micro-distillation where heat transfer has to be intensified. Indeed, the behaviour of binary mixtures on heat transfer is sometimes different than with a pure compound. The present study investigates the evaporation of ethanol in a sandwich plate micro-heat exchanger. Ethanol is a chemical test. It streams by gravity in falling film on two symmetrical heated micro-structured plates where micro-straight vertical channels have been machined (Kane et al., 2011). Electrical heat fluxes ranged from 2 to 5 kW/m(2). Various differences of temperatures between wall and saturation temperature were tested. Feed flow rate ranged between 1 and 5 g/min (smooth laminar flow: 2</abstract>
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