To the theory of ferrohydrodynamic circulating flow induced by running magnetic field

Abstract

We present results of theoretical modelling of macroscopic circulating flow induced in a drop of ferrofluid by oscillating running magnetic field. The drop is placed in a narrow flat channel filled by a non-magnetic liquid. The aim of this work is development of a scientific basis for a progressive method of address drug delivery to thrombus clots in blood vessels with the help of the magnetically induced circulation flow. Our results show that the oscillating running field allows inducing the carrier fluid flow with velocity amplitude 1-10 cm/s. This is the range of values, presenting interest from the point of view of the drug delivery.

Nonlinear theory of macroscopic flow induced in a drop of ferrofluid

“…In the beginning, a drop of the nanoparticle suspension is injected in the centre of the channel and a Gaussian concentration profile is assumed at zero time. This study is the continuation of our two previous works [6,7] dealing with a flat channel and covering only short time scales (after setting on the field) when the nanoparticle concentration profile remains unchanged. These first studies demonstrated that efficient recirculatory flows can only be generated in heterogeneous alternating magnetic fields which in their turn induce heterogeneous nanoparticle concentration profiles.…”