Figure 6.

Outflow rate computation in two layer media. Two iterations of the outflow rate beyond the starting assmption of uniform flow using the method described in the text are shown in (a) and (b): the dotted one is the first and the solid line the second iteration. The iterative method is useful for the case where there are a large number of small ports, and is described by a dimensionless number described in the text. In (a) this number was chosen to be 0.1, while (b) is the number appropriate for the microporous catheter, which turns out to be > 1. However the iterations still converge well for this device.