Krogh length

The Krogh Length, ${\displaystyle \lambda _{K}}$, is the distance to which nutrients diffuse between capillaries, based on cellular consumption of the nutrients.

It can be described as:

${\displaystyle \lambda _{K}={\sqrt {D_{s}c_{o}/R}}}$

where ${\displaystyle D_{s}}$ is the diffusion constant of the solute in the substrate, ${\displaystyle c_{o}}$ is the concentration in the channel, and ${\displaystyle R}$ is the consumption by the cells. Units are in terms of length.