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SUMMARY:Viscosity of bacterial suspensions: experiment and theory - Aronso
 n\, I (Argonne National Lab)
DTSTART:20100907T130000Z
DTEND:20100907T140000Z
UID:TALK26084@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Measurements of the shear viscosity in suspensions of swimming
  Bacillus subtilis in free-standing liquid films have revealed that the vi
 scosity can decrease by up to a factor of 7 compared to the viscosity of t
 he same liquid without bacteria or with nonmotile bacteria. The viscosity 
 depends on the concentration and swimming speed of the bacteria. \n\nThe e
 ffective viscosity of dilute suspensions of swimming bacteria from the mic
 roscopic details of the interaction of an elongated body with the backgrou
 nd flow is derived. An individual bacterium propels itself forward by rota
 ting its flagella and reorients itself randomly by tumbling. Due to the ba
 cteriums asymmetric shape\, interactions with a background flow cause the 
 bacteria to preferentially align in directions in which self-propulsion pr
 oduces a significant reduction in the effective viscosity. \n\n1. Andrey S
 okolov and Igor S. Aranson\, Reduction of Viscosity in Suspension of Swimm
 ing Bacteria\, Phys. Rev. Lett. 103\, 148101 (2009) 2. Brian M. Haines\, A
 ndrey Sokolov\, Igor S. Aranson\, Leonid Berlyand\, and Dmitry A. Karpeev\
 , Three-dimensional model for the effective viscosity of bacterial suspens
 ions\, Phys. Rev. E 80\, 041922 (2009) \n
LOCATION:Seminar Room 1\, Newton Institute
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