A simultaneous visualization and measurement study has been carried out to investigate flow boiling of water in the 8 parallel silicon microchannels heated from below. It is found that there are two large-amplitude/long-period oscillating boiling modes exist in microchannels depending on the amounts of heat flux and mass flux. When the outlet water temperature is at saturation temperature and the wall temperatures are superheated, while the inlet water temperature is still subcooled, a Liquid/Two-phase Alternating Flow (LTAF) mode appears in the microchannels. This LTAF mode disappears when the inlet temperatures reaches the saturation temperature. As the heat flux is further increased such that the outlet water is superheated while the inlet water temperature is oscillating between subcooled and saturation temperature, a Liquid/Two-phase/Vapor Alternating Flow (LTVAF) mode begins. During these two unstable boiling modes, there are large-amplitude and long-period oscillations of water and wall temperatures with respect to time. Bubbly flow as well as some peculiar two-phase flow pattern are observed during the two-phase flow periods of the two unstable modes in the microchannels.
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ASME 2003 1st International Conference on Microchannels and Minichannels
April 24–25, 2003
Rochester, New York, USA
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-3667-3
PROCEEDINGS PAPER
Two Large-Amplitude/Long-Period Oscillating Boiling Modes in Silicon Microchannels
H. Y. Wu,
H. Y. Wu
Hong Kong University of Science and Technology, Kowloon, Hong Kong
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Ping Cheng
Ping Cheng
Hong Kong University of Science and Technology, Kowloon, Hong Kong
Search for other works by this author on:
H. Y. Wu
Hong Kong University of Science and Technology, Kowloon, Hong Kong
Ping Cheng
Hong Kong University of Science and Technology, Kowloon, Hong Kong
Paper No:
ICMM2003-1079, pp. 629-633; 5 pages
Published Online:
February 24, 2009
Citation
Wu, HY, & Cheng, P. "Two Large-Amplitude/Long-Period Oscillating Boiling Modes in Silicon Microchannels." Proceedings of the ASME 2003 1st International Conference on Microchannels and Minichannels. 1st International Conference on Microchannels and Minichannels. Rochester, New York, USA. April 24–25, 2003. pp. 629-633. ASME. https://doi.org/10.1115/ICMM2003-1079
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