Simha, Aditi R and Ramaswamy, Sriram (2002) Hydrodynamic Fluctuations and Instabilities in Ordered Suspensions of Self-Propelled Particles. In: Physical Review Letters, 89 (5). 058101/1-4.
We construct the hydrodynamic equations for suspensions of self-propelled particles (SPPs) with spontaneous orientational order, and make a number of striking, testable predictions: (i) Nematic SPP suspensions are always absolutely unstable at long wavelengths. (ii) SPP suspensions support novel propagating modes at long wavelengths, coupling orientation, flow, and concentration. (iii) In a wave number regime accessible only in low Reynolds number systems such as bacteria, polar-ordered suspensions are invariably convectively unstable. (iv) The variance in the number N of particles, divided by the mean <N>, diverges as <N>2/3 in polar-ordered SPP suspensions.
|Item Type:||Journal Article|
|Additional Information:||Copyright for this article belongs to American Physical Society (APS).|
|Department/Centre:||Division of Physical & Mathematical Sciences > Physics|
|Date Deposited:||10 Nov 2004|
|Last Modified:||19 Sep 2010 04:17|
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