Abstract
We consider the tracer diffusion that arises from the run-and-tumble motion of low Reynolds number swimmers, such as bacteria. Assuming a dilute suspension, where the bacteria move in uncorrelated runs of length , we obtain an exact expression for for dipolar swimmers in three dimensions, hence explaining the surprising result that this is independent of . We compare to the contribution to tracer diffusion from entrainment.
- Received 23 July 2013
DOI:https://doi.org/10.1103/PhysRevLett.111.188101
© 2013 American Physical Society