Microbubbles emission flow boiling in a microchannel and minichannel

Manabu Tange, Maki Yuasa, Shu Takagi, Masahiro Shoji

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

15 Citations (Scopus)

Abstract

This paper reports the results of experimental investigations on microbubbles emission boiling (MEB) in a microchannel and minichannel. MEB is a boiling phenomenon under high subcool and high heat flux condition. To understand the mechanisms and processes of MEB, pool boiling on a thin wire under subcooled condition was firstly performed. Under various subcooling condition, the experiments of subcool boiling were performed. From photographic observation, distributions of bubble diameters and their dependence on subcooling were investigated. To achieve better understanding of the process of MEB and to find the incipient subcooling of MEB, a sound of ebullition was recorded and analyzed. It was found that 30 to 40 K are the incipient subcooling of MEB on the thin wire. In the experiment of MEB in microchannel and minichannel, the special attention was paid to longitudinal transition of boiling behavior, since bulk liquid temperature increases in short length in case of subcooled flow boiling. Boiling curves for various channel height were obtained from experimental data, and pressure drop through whole channel was measured. In a minichannel, annular flow flushed out the whole channel from the downstream to the upstream and the pressure drop fluctuates, while in a microchannel, flow pattern was divided into two regions: bubbly flow in upstream and annular flow in downstream.

Original languageEnglish
Title of host publicationProceedings of the Second International Conference on Microchannels and Minichannels (ICMM2004)
PublisherAmerican Society of Mechanical Engineers
Pages589-594
Number of pages6
ISBN (Print)0791841642, 9780791841648
DOIs
Publication statusPublished - 2004 Jan 1
EventProceedings of the Second International Conference on Microchannels and Minichannels (ICMM2004) - Rochester, NY, United States
Duration: 2004 Jun 172004 Jun 19

Publication series

NameProceedings of the Second International Conference on Microchannels and Minichannels (ICMM2004)

Conference

ConferenceProceedings of the Second International Conference on Microchannels and Minichannels (ICMM2004)
CountryUnited States
CityRochester, NY
Period04/6/1704/6/19

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Tange, M., Yuasa, M., Takagi, S., & Shoji, M. (2004). Microbubbles emission flow boiling in a microchannel and minichannel. In Proceedings of the Second International Conference on Microchannels and Minichannels (ICMM2004) (pp. 589-594). (Proceedings of the Second International Conference on Microchannels and Minichannels (ICMM2004)). American Society of Mechanical Engineers. https://doi.org/10.1115/icmm2004-2385