Porous Media Gel Growth

The swelling gel material model:

is intended for use in moisture absorption problems, which typically involve polymeric materials (such as in the analysis of diapers); and
can be used in the analysis of coupled pore liquid flow and porous medium stress.


Input Data	Description
Radius of gel particles when dry	Radius of gel particles when completely dry, $r_{a}^{d r y}$ .
Full swollen radius of gel particles	Full swollen radius of gel particles, $r_{a}^{f}$ .
Number of particles per unit volume	Number of gel particles per unit volume, $k_{a}$ .
Relaxation time constant for long term swelling	Relaxation time constant for long-term swelling of gel particles, $τ_{1}$ .