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Figure 4. Temperature and velocity distribution of the single window
Table 1. Maximum temperature for the single window
Bottom inlet velocity
(m/s)
Max. temp.
( o C)
1.1 1.35 1.5 2.0
2 277 2 086 2 003 1 808
The coolant flowing direction is x-directional co-ordinate and the vertical direction of the coolant
flowing is the y-directional co-ordinate. The spacing of the y-directional cells is 1 mm. We used the
same heat generation rates for the inner and outer windows as shown in Figure 2. The heat transfer of
the lower surface of lower window is treated by the heat transfer coefficient obtained by the
calculation of the single window.
Maximum temperatures in the double windows are presented in Table 2. The maximum
temperature in the inner window reaches 1 580 o C. This value is higher than the window melting
temperature. The inlet velocity of the Pb-Bi coolant flowing in the narrow channel must be larger than
6 m/s. As a result, the maximum temperature in the lower window reaches 1 077 o C for a 1.1 m/sec
bottom inlet velocity of the single window and 927 o C for a 2.0 m/s bottom inlet velocity.
Table 2. Maximum temperature for the double window
Bottom inlet velocity
(m/s)
Upper window
( o C)
Lower window
( o C)
1.1 1.35 1.5 2.0
1 580 1 580 1 580 1 580
1 077 1 027 997 927
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