Biomedical Engineering Reference
In-Depth Information
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0 0100
150
200
250
300
350
400
450
500
Time (sec)
FIGURE 6.3
Outer edge radial displacement as a function of time.
0.90
0.75
0.60
0.45
A = 0.9619
B = 0.9671
C = 0.9723
D = 0.9774
E = 0.9826
F = 0.9878
0.30
Ε
0.15
⊕
= 0.9819
∗
= 0.9878
0.00
0.00
0.15
0.30
0.45
0.60
0.75
0.90
X (cm)
Time
20.00
FIGURE 6.4
Solvent mass fraction at time = 20 sec.
The change in equilibrium conditions causes the gel to expel solvent through its
outer edge. Therefore, solvent leaves first from the outer edge region and also moves
from the inner region to the outside edge, causing concentration gradient rings. These
