Simulation on the flow and heat transfer characteristics of confined bubbles in micro-channels
2012 (English)In: ASME 2012 10th Int. Conf. on Nanochannels, Microchannels, and Minichannels Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 Fluids Engineering Division Sum, ICNMM 2012, 2012, 63-70 p.Conference paper (Refereed)
3D simulations on confined bubbles in micro-channels with diameter of 1.24 mm were conducted. The working fluid is R134a with a mass flux range from 125kg/m2s to 375kg/m2s. The VOF model is chosen to capture the 2 phase interface while the geo-construction method was used to re-construct the 2-phase interface. A heated boundary wall with heat flux varying from 15kW/m2 to 102kW/m2 is supplied. The wall temperature was calculated. The effects of mass flux and heat flux are studied. The shape of the bubble was predicted by the simulation successfully and the results show that they are independent of the initial shape. Both thin film evaporation and micro convection enhance the heat transfer. However, the micro convection which is caused by bubble motion has greater contribution to the total heat transfer at the stage of bubble growth studied.
Place, publisher, year, edition, pages
2012. 63-70 p.
3D simulations, Boundary walls, Bubble growth, Bubble motion, Flow and heat transfer, Initial shape, Thin film evaporation, Wall temperatures, Heat flux, Microchannels, Phase interfaces, Refrigerants, Heat transfer
IdentifiersURN: urn:nbn:se:kth:diva-131334DOI: 10.1115/ICNMM2012-73108ISI: 000335090900009ScopusID: 2-s2.0-84882351460ISBN: 978-079184479-3OAI: oai:DiVA.org:kth-131334DiVA: diva2:656399
ASME 2012 10th Int. Conf. on Nanochannels, Microchannels, and Minichannels, ICNMM 2012 Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 Fluids Engineering Division Sum, ICNMM 2012; Rio Grande; Puerto Rico; 8 July 2012 through 12 July 2012
QC 201310152013-10-152013-10-142014-10-08Bibliographically approved