The behavior of rewetting on a high superheated and dry surface, focusing on rewetting temperature just as collapse of saturated and subcooled film boiling was investigated experimentally and analytically. Saturated and subcooled pool film-boiling experiments were conducted by using a Silicon wafer with 20 mm length, 20 mm width and 0.5 mm thickness and pure water at atmospheric condition. Saturated and subcooled impingement jet experiments were also preformed. Then, the model analysis of rewetting initiation of a hot dry surface in saturated and subcooled film boiling was constructed by using hydrodynamics instability on liquid-vapor interface (Rayleigh-Taylor instability) and a heat conduction model (rewetting model under a falling film). Some physical parameters on Rayleigh-Taylor instability, for example released period of bubble from vapor film on a heater, generated volume rate of vapor and so on, were estimated by using Two-Phase Boundary Layer theory of saturated and subcooled film boiling. The present analytical results also showed that as the liquid subcooling was high, MHF temperature was higher. Namely, the predictions agreed with the present experimental results and Dhir-Purohit’s correlation. In addition, the present model of MHF temperature was developed by taking into account the dependence on thermal conductivity of wall of the MHF-temperature.
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2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4936-1
PROCEEDINGS PAPER
Mechanism and Modeling of Rewetting Initiation of Hot Dry Surface in Saturated and Subcooled Film Boiling
Hiroyasu Ohtake,
Hiroyasu Ohtake
Kogakuin University, Tokyo, Japan
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Shingo Kobayashi,
Shingo Kobayashi
Kogakuin University, Tokyo, Japan
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Nozomi Nagashima,
Nozomi Nagashima
Kogakuin University, Tokyo, Japan
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Yasuo Koizumi
Yasuo Koizumi
Shinshu University, Tokyo, Japan
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Hiroyasu Ohtake
Kogakuin University, Tokyo, Japan
Shingo Kobayashi
Kogakuin University, Tokyo, Japan
Nozomi Nagashima
Kogakuin University, Tokyo, Japan
Yasuo Koizumi
Shinshu University, Tokyo, Japan
Paper No:
IHTC14-22863, pp. 539-546; 8 pages
Published Online:
March 1, 2011
Citation
Ohtake, H, Kobayashi, S, Nagashima, N, & Koizumi, Y. "Mechanism and Modeling of Rewetting Initiation of Hot Dry Surface in Saturated and Subcooled Film Boiling." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 1. Washington, DC, USA. August 8–13, 2010. pp. 539-546. ASME. https://doi.org/10.1115/IHTC14-22863
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