  A wetting liquid is driven through a thin gap due to surface tension and when
the gap boundaries are elastic, the liquid deforms the gap as it rises. But
when the fluid boundaries are also permeable (or poroelastic), the liquid can
permeate the boundaries as the fluid rises and change their properties, for
example by swelling and softening, thereby altering the dynamics of the rise.
In this paper, we study the dynamics of capillary rise between two poroelastic
sheets to understand the effects of boundary permeability and softening. We
find that if the bending rigidity of sheets is reduced, due to liquid
permeation, the sheets coalesce faster compared to the case of impermeable
sheets. We show that as a direct consequence of this faster coalescence, the
volume of fluid captured between the sheets can be significantly lower.
