Critical heat flux (CHF) of convective boiling in a mini-tube due to power transient was measured. A platinum tube with an inner diameter of 1.0 mm was heated exponentially by a direct current power supply as Joule heating. The heated length of the platinum tube was 40.9 mm. The platinum tube was mounted vertically in the water-loop apparatus which consisted of a circulating pump, a pre-heater, a flow mater, a pressurizer, a cooler and a test section. The deionized water was pressurized by the pressurizer up to approximately 800 kPa to measure CHFs at the high subcooling. The upward flow velocity in the platinum tube was ranged from 5 to 11 m/s. The inlet subcooling was ranged from 92 to 117 K. The heat generation rate was controlled with exponential functions. The e-folding time of the heat generation rate was ranged from 30 ms to 18 s. As an experimental result, it was found that the CHFs increased with increasing the flow velocity and the inlet subcooling. The CHF also increased with decreasing the e-folding time of the heat generation rate. Since the heat generation rate of the platinum tube increased rapidly under the power transient condition, it was considered that the heat flux of the platinum tube increased until the vapor blanket covered the heated surface of the platinum tube.
Skip Nav Destination
ASME 2017 Heat Transfer Summer Conference
July 9–12, 2017
Bellevue, Washington, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-5789-2
PROCEEDINGS PAPER
Critical Heat Flux for Convective Boiling in Mini-Tube due to Power Transient
Makoto Shibahara,
Makoto Shibahara
Kobe University, Kobe, Japan
Search for other works by this author on:
Katsuya Fukuda,
Katsuya Fukuda
Kobe University, Kobe, Japan
Search for other works by this author on:
Koichi Hata
Koichi Hata
Kobe University, Kobe, Japan
Search for other works by this author on:
Makoto Shibahara
Kobe University, Kobe, Japan
Katsuya Fukuda
Kobe University, Kobe, Japan
Qiusheng Liu
Kobe University, Kobe, Japan
Koichi Hata
Kobe University, Kobe, Japan
Paper No:
HT2017-5043, V002T14A009; 6 pages
Published Online:
October 18, 2017
Citation
Shibahara, M, Fukuda, K, Liu, Q, & Hata, K. "Critical Heat Flux for Convective Boiling in Mini-Tube due to Power Transient." Proceedings of the ASME 2017 Heat Transfer Summer Conference. Volume 2: Heat Transfer Equipment; Heat Transfer in Multiphase Systems; Heat Transfer Under Extreme Conditions; Nanoscale Transport Phenomena; Theory and Fundamental Research in Heat Transfer; Thermophysical Properties; Transport Phenomena in Materials Processing and Manufacturing. Bellevue, Washington, USA. July 9–12, 2017. V002T14A009. ASME. https://doi.org/10.1115/HT2017-5043
Download citation file:
13
Views
Related Proceedings Papers
Related Articles
Subcooled Boiling Heat Transfer for Turbulent Flow of Water in a Short Vertical Tube
J. Heat Transfer (January,2010)
Steady-State Subcooled Nucleate Boiling on a Downward-Facing Hemispherical Surface
J. Heat Transfer (May,1998)
Subcooled Water Flow Boiling Heat Transfer in a Short SUS304-Tube With Twisted-Tape Insert
J. Eng. Gas Turbines Power (May,2011)
Related Chapters
Scope of Section I, Organization, and Service Limits
Power Boilers: A Guide to the Section I of the ASME Boiler and Pressure Vessel Code, Second Edition
Simultaneous Thermal Conductivity and Specific Heat Measurements of Thin Samples by Transient Joule Self-Heating
Inaugural US-EU-China Thermophysics Conference-Renewable Energy 2009 (UECTC 2009 Proceedings)
Dynamic Behavior of Pumping Systems
Pipeline Pumping and Compression Systems: A Practical Approach