10.4 Conclusions
Effect of surface wettability on boiling heat transfer was studied by applying
photocatalysis effect and radiation-induced surface activation. The main conclusions are as follows.
• Wettability enhancement was observed by proton-beam irradiation as well as the
ultraviolet and γ-ray irradiation.
• In comparing the irradiation between that in air and and that in water, no
influence of the radiation environment is observed for ultraviolet irradiation.
However, the wettability was well enhanced by γ-ray and proton-beam irradiation in water rather than in air.
• The boiling curve with ultraviolet irradiation moves to the higher wall superheated side in the nucleate boiling region. In contrast, the boiling curve with
irradiation moves to the lower wall superheated side in the MEB region.
• A similar tendency of the boiling curve was observed with γ-ray irradiation in
comparison to the ultraviolet irradiation.
• The effect of irradiation on the CHF was not obvious at present experimental
conditions.
Acknowledgments The authors express their sincere gratitude to Prof. Y. Takata and
Dr. S. Hidaka of Kyushu University for their valuable comments and technical assistance.
A part of this study is the result of “Research and Development for an Accelerator-Driven
Sub-Critical System using a FFAG Accelerator” carried out under the Strategic Promotion
Program for Basic Nuclear Research by the Ministry of Education, Culture, Sports, Science and
Technology of Japan.
Open Access This chapter is distributed under the terms of the Creative Commons Attribution
Noncommercial License, which permits any noncommercial use, distribution, and reproduction in
any medium, provided the original author(s) and source are credited.
References
1. Cinotti L, Giraud B, Aı ¨t Abderrahim H (2004) The experimental accelerator driven system
(XADS) designs in the EURATOM 5th framework programme. J Nucl Mater 335:148–155
2. Maes D (2006) Mechanical design of the small-scale experimental ADS: MYRRHA. Energ
Convers Manag 47:2710–2723
3. Oigawa H et al (2011) Role of ADS in the back-end of the fuel cycle strategies and associated
design activities: the case of Japan. J Nucl Mater 415:229–236
4. Cheng X et al (2006) Thermal-hydraulic analysis of the TRADE spallation target.
Nucl Instrum Methods Phys Res A 562:855–858
5. Hao J-H et al (2013) Target thickness optimization design of a spallation neutron source target
cooling system. Appl Therm Eng 61:641–648
6. Ito D, Nishi D, Saito Y (2014) Effect of ultraviolet and radiation on surface wettability.
Multiphase Flow 30:209–220 (in Japanese)
104
D. Ito et al.
Effect of surface wettability on boiling heat transfer was studied by applying
photocatalysis effect and radiation-induced surface activation. The main conclusions are as follows.
• Wettability enhancement was observed by proton-beam irradiation as well as the
ultraviolet and γ-ray irradiation.
• In comparing the irradiation between that in air and and that in water, no
influence of the radiation environment is observed for ultraviolet irradiation.
However, the wettability was well enhanced by γ-ray and proton-beam irradiation in water rather than in air.
• The boiling curve with ultraviolet irradiation moves to the higher wall superheated side in the nucleate boiling region. In contrast, the boiling curve with
irradiation moves to the lower wall superheated side in the MEB region.
• A similar tendency of the boiling curve was observed with γ-ray irradiation in
comparison to the ultraviolet irradiation.
• The effect of irradiation on the CHF was not obvious at present experimental
conditions.
Acknowledgments The authors express their sincere gratitude to Prof. Y. Takata and
Dr. S. Hidaka of Kyushu University for their valuable comments and technical assistance.
A part of this study is the result of “Research and Development for an Accelerator-Driven
Sub-Critical System using a FFAG Accelerator” carried out under the Strategic Promotion
Program for Basic Nuclear Research by the Ministry of Education, Culture, Sports, Science and
Technology of Japan.
Open Access This chapter is distributed under the terms of the Creative Commons Attribution
Noncommercial License, which permits any noncommercial use, distribution, and reproduction in
any medium, provided the original author(s) and source are credited.
References
1. Cinotti L, Giraud B, Aı ¨t Abderrahim H (2004) The experimental accelerator driven system
(XADS) designs in the EURATOM 5th framework programme. J Nucl Mater 335:148–155
2. Maes D (2006) Mechanical design of the small-scale experimental ADS: MYRRHA. Energ
Convers Manag 47:2710–2723
3. Oigawa H et al (2011) Role of ADS in the back-end of the fuel cycle strategies and associated
design activities: the case of Japan. J Nucl Mater 415:229–236
4. Cheng X et al (2006) Thermal-hydraulic analysis of the TRADE spallation target.
Nucl Instrum Methods Phys Res A 562:855–858
5. Hao J-H et al (2013) Target thickness optimization design of a spallation neutron source target
cooling system. Appl Therm Eng 61:641–648
6. Ito D, Nishi D, Saito Y (2014) Effect of ultraviolet and radiation on surface wettability.
Multiphase Flow 30:209–220 (in Japanese)
104
D. Ito et al.