Page 174 - Process Modelling and Simulation With Finite Element Methods

Extended Multiphysics 161

Time=l Velocity Vectors Time=l lsopycnals of cl
5
6
45
45
1
4
35 36
3 3
25 25
2 7
15 15
3 1
05
05
0
0
2 1 0 1 2 3 1 5 6 7 2 l 0 1 2 3 4 5 6 7
Time=5 Velocity Vectors Time=5 lsopycnals of cl
5
45 45
4 4
35 35
3 3
25 25
2 2
15 15
1 1
05 05
0 0
2 1 0 1 2 3 4 1 6 7 2 1 0 1 2 3 4 5 6 7
Time=20 Velocty vectors Time=20 lsopycnals of cl Uer I
5 0 9822
5 0 3544
45 0 9456
45 0 9288
4 4 0911
0 8ml
35 31 0 8753
0 8575
3 3 0 887
06719
25 25 o 814,
0 7863
2 2 o n 7685
7507
15 15 07x23
1 0 725
1 0 6972
05616
06 0 6794
05
0 a 6438
' 2 1 0 1 2 3 4 5 6 7 2 1 0 1 2 3 4 5 6 7 Mn D m
Tirne=35 Velocty vectors Time=35 lsopycnals of cl
5
5
45 45
4
4
35 35
3 3
25 25
2 2
15 15
, 1
05
05
0
'2 1 0 1 2 3 4 5 6 7 2 1 0 1 2 3 4 5 6 7
Figure 4.15 History of forced convection in the buffer tank. Early times do not show the
establishment of an upper recirculation zone, which does not occur until about time t=5. Forced
convection drags the lighter fluid with it at early times. It is only once stratification develops that
recirculation follows. The later times are apparently self-similar in profiles.