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Single bubble geometry evolution in micro-scale space

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Original languageEnglish
Pages (from-to)31-40
Number of pages10
JournalInternational Journal of Thermal Sciences
Volume67
DOIs
Publication statusPublished - May 2013

Abstract

Two types of single vapour bubble growth in micro-scale space are experimentally investigated. Degassed pentane and FC-72 are used to study the bubble confined between superheated parallel plates without liquid flow. Liquid properties which are influential on bubble growth are discussed. Effects of plate superheating and plate gap on bubble growth rate are examined. Bubble growth during flow boiling in high aspect ratio micro-channels is also examined to extensively investigate the single bubble growth in a dynamic configuration. The hydraulic diameters of the tested channel are 571 mu m, 762 gm and 1454 gm, with an aspect ratio of 20, 20 and 10 respectively. Transparent heating technique is utilised to provide heating power while ensuring sufficient transparency for visualisation. A three-stage bubble growth mode is presented. Moreover, bubble geometry evolution is found to be strongly related to channel cross-sectional geometry but slightly affected by heat flux or mass flux. Bubble growth critical time is defined. Bubble equivalent radius, bubble aspect ratio and width versus length trends are also discussed. (C) 2012 Elsevier Masson SAS. All rights reserved.

    Research areas

  • Bubble growth, Superheating, High aspect ratio micro-channel, Flow boiling, Transparent heating, 2-DIMENSIONAL VAPOR BUBBLE, BOILING HEAT-TRANSFER, RECTANGULAR MICROCHANNELS, PARALLEL MICROCHANNELS, UNSTEADY EXPANSION, FLOW, GROWTH, DYNAMICS, CONTRACTION, DETACHMENT

ID: 18085563