Resonant alignment of microswimmer trajectories in oscillatory shear flows

Alexander Hope, Ottavio A. Croze, Wilson C. K. Poon, Martin A. Bees, Mark D. Haw

Research output: Contribution to journalArticle

Abstract

Oscillatory flows are commonly experienced by swimming micro-organisms in the environment, industrial applications, and rheological investigations. We characterize experimentally the response of the alga Dunaliella salina to oscillatory shear flows and report the surprising discovery that algal swimming trajectories orient perpendicular to the flow-shear plane. The ordering has the characteristics of a resonance in the driving parameter space. The behavior is qualitatively reproduced by a simple model and simulations accounting for helical swimming, suggesting a mechanism for ordering and criteria for the resonant amplitude and frequency. The implications of this work for active oscillatory rheology and industrial algal processing are discussed.
LanguageEnglish
Article number051201
Number of pages8
JournalPhysical Review Fluids
Volume1
DOIs
StatePublished - 20 Sep 2016

Fingerprint

Shear flow
shear flow
alignment
Trajectories
trajectories
Dunaliella
algae
Algae
Rheology
rheology
organisms
Industrial applications
Processing
Swimming
simulation

Keywords

  • algae
  • flow
  • biodiesel
  • microswimmer
  • oscillatory shear flow

Cite this

Hope, Alexander ; Croze, Ottavio A. ; Poon, Wilson C. K. ; Bees, Martin A. ; Haw, Mark D./ Resonant alignment of microswimmer trajectories in oscillatory shear flows. In: Physical Review Fluids. 2016 ; Vol. 1.
@article{d5a9c5e9cc154b8bbf51f143305329d0,
title = "Resonant alignment of microswimmer trajectories in oscillatory shear flows",
abstract = "Oscillatory flows are commonly experienced by swimming micro-organisms in the environment, industrial applications, and rheological investigations. We characterize experimentally the response of the alga Dunaliella salina to oscillatory shear flows and report the surprising discovery that algal swimming trajectories orient perpendicular to the flow-shear plane. The ordering has the characteristics of a resonance in the driving parameter space. The behavior is qualitatively reproduced by a simple model and simulations accounting for helical swimming, suggesting a mechanism for ordering and criteria for the resonant amplitude and frequency. The implications of this work for active oscillatory rheology and industrial algal processing are discussed.",
keywords = "algae, flow, biodiesel, microswimmer, oscillatory shear flow",
author = "Alexander Hope and Croze, {Ottavio A.} and Poon, {Wilson C. K.} and Bees, {Martin A.} and Haw, {Mark D.}",
year = "2016",
month = "9",
day = "20",
doi = "10.1103/PhysRevFluids.1.051201",
language = "English",
volume = "1",
journal = "Physical Review Fluids",
issn = "2469-990X",

}

Resonant alignment of microswimmer trajectories in oscillatory shear flows. / Hope, Alexander; Croze, Ottavio A.; Poon, Wilson C. K.; Bees, Martin A.; Haw, Mark D.

In: Physical Review Fluids, Vol. 1, 051201, 20.09.2016.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Resonant alignment of microswimmer trajectories in oscillatory shear flows

AU - Hope,Alexander

AU - Croze,Ottavio A.

AU - Poon,Wilson C. K.

AU - Bees,Martin A.

AU - Haw,Mark D.

PY - 2016/9/20

Y1 - 2016/9/20

N2 - Oscillatory flows are commonly experienced by swimming micro-organisms in the environment, industrial applications, and rheological investigations. We characterize experimentally the response of the alga Dunaliella salina to oscillatory shear flows and report the surprising discovery that algal swimming trajectories orient perpendicular to the flow-shear plane. The ordering has the characteristics of a resonance in the driving parameter space. The behavior is qualitatively reproduced by a simple model and simulations accounting for helical swimming, suggesting a mechanism for ordering and criteria for the resonant amplitude and frequency. The implications of this work for active oscillatory rheology and industrial algal processing are discussed.

AB - Oscillatory flows are commonly experienced by swimming micro-organisms in the environment, industrial applications, and rheological investigations. We characterize experimentally the response of the alga Dunaliella salina to oscillatory shear flows and report the surprising discovery that algal swimming trajectories orient perpendicular to the flow-shear plane. The ordering has the characteristics of a resonance in the driving parameter space. The behavior is qualitatively reproduced by a simple model and simulations accounting for helical swimming, suggesting a mechanism for ordering and criteria for the resonant amplitude and frequency. The implications of this work for active oscillatory rheology and industrial algal processing are discussed.

KW - algae

KW - flow

KW - biodiesel

KW - microswimmer

KW - oscillatory shear flow

UR - https://journals.aps.org/prfluids/

U2 - 10.1103/PhysRevFluids.1.051201

DO - 10.1103/PhysRevFluids.1.051201

M3 - Article

VL - 1

JO - Physical Review Fluids

T2 - Physical Review Fluids

JF - Physical Review Fluids

SN - 2469-990X

M1 - 051201

ER -