Comptes Rendus
Non-isothermal separation of ferrofluid particles through grids: Abnormal magnetic Soret effect
Comptes Rendus. Mécanique, Volume 341 (2013) no. 4-5, pp. 348-355.

Nanoparticle transport through thin non-isothermal ferrofluid layer between permeable walls is investigated. The transient mass flux is determined from measurements of particle concentration changes in two fluid chambers of different temperatures which are attached on both sides of the layer. Experiments are performed employing fluid samples of small ordinary magnetic Soret effect, which is detected by thermal grating technique. The separation measurements say that a magnetic field, aligned along a temperature gradient, causes a remarkable increase in the mass diffusion coefficient and a simultaneous decrease in particle thermodiffusion mobility. It is proposed that the observed effects may be evoked by specific microconvective mass transfer induced by nonmagnetic grid elements of the permeable walls.

Publié le :
DOI : 10.1016/j.crme.2013.01.009
Mots clés : Colloidal particle, Ferrofluid, Mass diffusion, Soret effect, Thermodiffusion

Elmars Blums 1 ; Viesturs Sints 1 ; Gunars Kronkalns 1 ; Ansis Mezulis 1

1 Institute of Physics, University of Latvia, Miera 32, Salaspils LV-2169, Latvia
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Elmars Blums; Viesturs Sints; Gunars Kronkalns; Ansis Mezulis. Non-isothermal separation of ferrofluid particles through grids: Abnormal magnetic Soret effect. Comptes Rendus. Mécanique, Volume 341 (2013) no. 4-5, pp. 348-355. doi : 10.1016/j.crme.2013.01.009. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2013.01.009/

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[5] E. Blums; S. Odenbach; A. Mezulis; M. Maiorov Soret coefficient of nanoparticles in ferrofluids in the presence of a magnetic field, Phys. Fluids, Volume 10 (1998), pp. 2155-2163

[6] T. Voelker; E. Blums; S. Odenbach Thermodiffusive processes in ferrofluids, Magnetohydrodynamics, Volume 37 (2001), pp. 274-278

[7] E. Blums Magnetic Soret effect in ferrocolloids: experimental results and new problems, Magnetohydrodynamics, Volume 39 (2003) no. 3, pp. 353-360

[8] T. Voelker; S. Odenbach Thermodiffusion in ferrofluids in the presence of a magnetic field, Phys. Fluids, Volume 17 (2005), p. 037104

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[10] A. Mežulis; E. Blums On the microconvective instability in optically induced gratings, Phys. Fluids, Volume 18 (2006), p. 107101

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[12] T. Voelker; E. Blums; S. Odenbach Determination of the Soret coefficient of magnetic particles in a ferrofluid from the steady and unsteady part of the separation curves, Int. J. Heat Mass Transfer, Volume 47 (2004), pp. 4315-4325

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