TY - GEN
T1 - Radiation induced surface activity phenomenon (1st report
T2 - 10th International Conference on Nuclear Engineering (ICONE 10)
AU - Imai, Yasuyuki
AU - Koga, Tatsuya
AU - Takamasa, Tomoji
AU - Okamoto, Koji
AU - Uematsu, Susumu
PY - 2002
Y1 - 2002
N2 - Improving the limit of boiling heat transfer or critical heat flux requires that the cooling liquid can contact the heating surface, or a high-wettability, highly hydrophilic heating surface, even if a vapor bubble layer is generated on the surface. We investigated surface wettability using metal oxides irradiated by gamma rays in room condition. Contact angle, an indicator of macroscopic wettability, was measured by image processing of the images obtained by a CCD video camera. The results showed that the surface wettability on oxide metal pieces of titanium, zircalloy No. 4, SUS-304 and copper improved significantly by Radiation Induced Surface Activity (RISA) phenomenon. Highly hydrophilic conditions on the test pieces were achieved after 500 kGy irradiation of 60Co gamma ray.
AB - Improving the limit of boiling heat transfer or critical heat flux requires that the cooling liquid can contact the heating surface, or a high-wettability, highly hydrophilic heating surface, even if a vapor bubble layer is generated on the surface. We investigated surface wettability using metal oxides irradiated by gamma rays in room condition. Contact angle, an indicator of macroscopic wettability, was measured by image processing of the images obtained by a CCD video camera. The results showed that the surface wettability on oxide metal pieces of titanium, zircalloy No. 4, SUS-304 and copper improved significantly by Radiation Induced Surface Activity (RISA) phenomenon. Highly hydrophilic conditions on the test pieces were achieved after 500 kGy irradiation of 60Co gamma ray.
KW - Contact angle
KW - Metal oxides
KW - Radiation induced surface activity (RISA)
KW - Thermal characteristics
UR - http://www.scopus.com/inward/record.url?scp=0036387509&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036387509&partnerID=8YFLogxK
U2 - 10.1115/icone10-22747
DO - 10.1115/icone10-22747
M3 - Conference contribution
AN - SCOPUS:0036387509
SN - 9784888982566
T3 - International Conference on Nuclear Engineering, Proceedings, ICONE
SP - 979
EP - 982
BT - International Conference on Nuclear Engineering, Proceedings, ICONE
PB - American Society of Mechanical Engineers(ASME)
Y2 - 14 April 2002 through 18 April 2002
ER -