Unbiased Diffusion through a Linear Porous Media with Periodic Entropy Barriers: A Tube Formed by Contacting Ellipses

Figure 2

Periodic elliptic tube. (a) A tube made of juxtaposed elliptic sections (each an elliptic tube as depicted in Figure 1) is called a periodic elliptic tube. Its shape is schematically shown in (b).

(a)

(b)