Fig. 2

Dimensionless gradient profiles in the PAPm. Concentration distributions at various dimensionless time values (τ) in a cylinder with initial uniform concentration C1 at the base C0 concentration at the opposite end. τ=Dabt/L2

Dimensionless gradient profiles in the PAPm. Concentration distributions at various dimensionless time values (τ) in a cylinder with initial uniform concentration C1 at the base C0 concentration at the opposite end. τ=Dabt/L2