Title: Behavior of passive admixture in a vortical hydrodynamic field
Author(s):

	R.O.Bobrov (Department of Theoretical Physics, Odessa National Mechnikov University, 2, Dvoryanskaya Str., 65026 Odessa, Ukraine) ,
	A.V.Kyrylyuk (Eindhoven University of Technology, P.O.Box 513, 5600 MB Eindhoven, The Netherlands) ,
	A.V.Zatovsky (Department of Theoretical Physics, Odessa National Mechnikov University, 2, Dvoryanskaya Str., 65026 Odessa, Ukraine)

The motion of passive admixture of spherical particles in the stationary hydrodynamic field of a swirling flow is studied. A spherical particle of a given mass in the hydrodynamic field of a swirling flow is located on a certain circular orbit, where the centrifugal force is compensated by the radial drag force due to the sink. This leads to the separation of the host fluid and admixture. A theory of Brownian motion of admixture in dilute solutions with a non-uniform flow is constructed.

Key words: vortical hydrodynamic field, Brownian motion, passive admixture
PACS: 47.32.-y, 82.40.Ck, 02.60.Cb