Edinburgh Research Explorer

Two phase boiling and flow instabilities in a microchannel

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

Related Edinburgh Organisations

Original languageEnglish
Title of host publicationproceedings of the 5th International Conference on Nanochannels, Microchannels and Minichannels, June 18th, 2007, Puebla, Mexico
Place of PublicationNEW YORK
PublisherAmerican Society for Mechanical Engineers
Pages75-81
Number of pages7
ISBN (Print)978-0-7918-4272-X
Publication statusPublished - 2007
Event5th International Conference on Nanochannels, Microchannels, and Minichannels - Puebla, Mexico
Duration: 18 Jun 200720 Jun 2007

Conference

Conference5th International Conference on Nanochannels, Microchannels, and Minichannels
CountryMexico
Period18/06/0720/06/07

Abstract

Boiling in microchannels is a very efficient mode of heat transfer. High heat and mass transfer coefficients are achieved. Evaporation of the liquid meniscus is the main contributor to the high heat fluxes achieved due to phase change at thin liquid films in a microchannel. The microscale hydrodynamic motion and the mechanisms at the immediate vicinity of the moving contact line are still not fully comprehended. There are several flow instabilities during boiling in microchannels. These instabilities need to be well understood and predicted due to their adverse effects on the heat transfer. It is hoped to understand particular flow instabilities, such as flow reversal, through experimental research at the contact line. A simultaneous visualisation and measurement experiment was carried out to investigate these flow instabilities in microchannels. Boiling has been induced in a microchannel (d(h) 570 mu m), stabilising just one liquid-vapour interface, and observing its progression through various microchannel geometries. Images and video sequences have been achieved with both a high speed camera and an infra red camera. Analysis of these images allow the application of several existing models to be fitted to our flow instability observations, namely flow reversal and its possible mechanism of vapour recoil, at the moving contact line.

    Research areas

  • SMALL-DIAMETER CHANNELS, HEAT-TRANSFER, REDUCED PRESSURE, MINICHANNELS, EVAPORATION, STABILITY

ID: 5224778