Flow boiling in transparent heated microtube

Osamu Kawanami, Shih Che Huang, Kazunari Kawakami, Itsuro Honda, Yousuke Kawashima, Haruhiko Ohta

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

Abstract

In the present study, a detailed investigation of flow boiling in a transparent heated microtube was performed. The transparent heated tube was made by electroless gold plating method. The enclosed gas-liquid interface could be clearly recognized through the tube wall, and the inner wall temperature measurement and direct heating of the film were simultaneously conducted by using the tube. The experimental conditions were: tube diameter 1 mm, mass velocity 100 kg/m2s, inlet liquid subcooling 20 K and heat flux up to 384 kW/m2 in the open system. Flow fluctuation was minimized by employing a twin plunger pump. Among our experimental results, we observed a high-frequency fluctuation of the inner wall temperature and a sharp peak for the heat transfer coefficient with high heat flux conditions, which have not been reported in previous experiments. This abrupt increase in the heat transfer coefficient coincided with a slight rapid axial growth of an elongated bubble found in the observation of the flow behavior. Hence, in low heat flux conditions, the fluctuations of temperature and heat transfer coefficient are strongly suppressed except for the instances when there is no bubble in the tube.

Original languageEnglish
Title of host publicationProceedings of the 6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008
Pages685-691
Number of pages7
EditionPART A
DOIs
Publication statusPublished - Dec 1 2008
Event6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008 - Darmstadt, Germany
Duration: Jun 23 2008Jun 25 2008

Publication series

NameProceedings of the 6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008
NumberPART A

Other

Other6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008
CountryGermany
CityDarmstadt
Period6/23/086/25/08

All Science Journal Classification (ASJC) codes

  • Process Chemistry and Technology

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  • Cite this

    Kawanami, O., Huang, S. C., Kawakami, K., Honda, I., Kawashima, Y., & Ohta, H. (2008). Flow boiling in transparent heated microtube. In Proceedings of the 6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008 (PART A ed., pp. 685-691). (Proceedings of the 6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008; No. PART A). https://doi.org/10.1115/ICNMM2008-62314