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 sub-cooling 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.
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ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels
June 23–25, 2008
Darmstadt, Germany
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4834-5
PROCEEDINGS PAPER
Flow Boiling in Transparent Heated Microtube
Osamu Kawanami,
Osamu Kawanami
University of Hyogo, Himeji, Hyogo, Japan
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Shih-Che Huang,
Shih-Che Huang
University of Hyogo, Himeji, Hyogo, Japan
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Kazunari Kawakami,
Kazunari Kawakami
University of Hyogo, Himeji, Hyogo, Japan
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Itsuro Honda,
Itsuro Honda
University of Hyogo, Himeji, Hyogo, Japan
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Yousuke Kawashima,
Yousuke Kawashima
University of Hyogo, Himeji, Hyogo, Japan
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Haruhiko Ohta
Haruhiko Ohta
Kyushu University, Fukuoka, Japan
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Osamu Kawanami
University of Hyogo, Himeji, Hyogo, Japan
Shih-Che Huang
University of Hyogo, Himeji, Hyogo, Japan
Kazunari Kawakami
University of Hyogo, Himeji, Hyogo, Japan
Itsuro Honda
University of Hyogo, Himeji, Hyogo, Japan
Yousuke Kawashima
University of Hyogo, Himeji, Hyogo, Japan
Haruhiko Ohta
Kyushu University, Fukuoka, Japan
Paper No:
ICNMM2008-62314, pp. 685-691; 7 pages
Published Online:
June 11, 2009
Citation
Kawanami, O, Huang, S, Kawakami, K, Honda, I, Kawashima, Y, & Ohta, H. "Flow Boiling in Transparent Heated Microtube." Proceedings of the ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. Darmstadt, Germany. June 23–25, 2008. pp. 685-691. ASME. https://doi.org/10.1115/ICNMM2008-62314
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