FIG. 2.

Effective diffusivity, D_eff, normalized to D₀, as a function of the ratio l/a at λ = 0.5 (a) and λ = 1.0 (b). Solid curves are the theoretically predicted dependences drawn using Eq. (2.7) with D_λ given by the KP formula in Eq. (2.9). Symbols are the normalized values of the effective diffusivity obtained from Brownian dynamics simulations. Dashed curves are drawn using Eq. (2.7) with D_λ replaced by D_λ,γ given in Eq. (3.2), where D_λ is given by the KP formula in Eq. (2.9).