Event

Revisiting Jeffery orbits; the importance of shape for micro-organism transport

Dr Rachel Bearon (University of Liverpool)

  • Thu 8 Nov 18

    14:00 - 16:00

  • Colchester Campus

    STEM Centre 3.1

  • Event speaker

    Dr Rachel Bearon

  • Event type

    Lectures, talks and seminars

  • Event organiser

    Mathematical Sciences, Department of

  • Contact details

    Dr Harrison

Revisiting Jeffery orbits; the importance of shape for micro-organism transport

Classical work of Jeffery from 1922 established how at low Reynolds number, ellipsoids in steady shear flow undergo periodic motion with non-uniform rotation rate, termed 'Jeffery orbits'.  I will present two problems where Jeffery orbits play a critical role in understanding the transport and aggregation of rod-shaped organisms.  I will discuss the trapping of motile chemotactic bacteria in high shear, and the sedimentation rate of negatively buoyant plankton.

Key references:
Bearon, R. N., & Hazel, A. L. (2015). The trapping in high-shear regions of slender bacteria undergoing chemotaxis in a channel. JOURNAL OF FLUID MECHANICS, 771. doi:10.1017/jfm.2015.198

Clifton, W., Bearon, R. N., & Bees, M. A. (2018). Enhanced sedimentation of elongated plankton in simple flows. IMA JOURNAL OF APPLIED MATHEMATICS, 83(4), 743-766. doi:10.1093/imamat/hxy024