Cylindrical Design: Comments
Perforated tubes replaced uniformly porous tubes.
Turbulent mixing increased rate of pH change.
Smooth stress gradients were achieved by gradually
increasing saponification from terminations to mid region.
Variable expansion/contraction rate increased stress failures.
Unquided and uneven fluid flow through the fiber
bundles produced non-uniform stress.
Quantitative model of gel, fluid delivery, and mechanical
systems aided subsequent design.
Hysteretic behavior of the amphoteric gel, poly(acrylonitrile)
(PAN) requires substantial pH changes.