heaters are installed in the copper block (3 kW in total). Two different copper
blocks were fabricated to investigate the wettability effect on the heat transfer: one
is a test section for ultraviolet irradiation and the other is for γ-ray irradiation. Both
test sections are illustrated in Fig. 10.5: three thermocouples are inserted into the
cylindrical part of each copper block to estimate heat flux and surface temperature.
0
5
10
15
20
0
10
20
30
40
50
60
70
80
Integrated irradiation dose [J/cm
2 ]
Contact angle [deg.]
air
water
a
0
20
40
60
80
100
0
10
20
30
40
50
60
70
80
Integrated irradiation dose [kGy]
Contact angle [deg.]
air
water
b
0
100
200
300
400
500
0
10
20
30
40
50
60
70
80
Time [min]
Contact angle [deg.]
air
water
c
Fig. 10.4 Change of contact angle from ultraviolet, γ-ray, and proton beam irradiation to TiO 2
sample. (a) Ultraviolet irradiation. (b) γ-Ray irradiation. (c) Proton beam irradiation
10 Heat Transfer Study for ADS Solid Target: Surface Wettability. . .
99