Comptes Rendus
no. 4-5
Non-isothermal separation of ferrofluid particles through grids: Abnormal magnetic Soret effect
Elmars Blums1  ; Viesturs Sints1 ; Gunars Kronkalns1 ; Ansis Mezulis1
1 Institute of Physics, University of Latvia, Miera 32, Salaspils LV-2169, Latvia
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/

[1] E. Blums; A. Cebers; M. Maiorov Magnetic Fluids, Walter de Gryuter, Berlin, New York, 1997

[2] J. Lenglet; A. Bourdon; J.-C. Bacri; G. Demouchy Thermodiffusion in magnetic colloids evidenced and studied by forced Rayleigh scattering experiments, Phys. Rev. E, Volume 65 (2002), pp. 31408-31421

[3] G. Demouchy; A. Mezulis; A. Bee; D. Talbot; J.-C. Bacri; A. Bourdon Diffusion and thermodiffusion studies in ferrofluids with a new two-dimensional forced Rayleigh scattering technique, J. Phys. D. Appl. Phys., Volume 37 (2004), pp. 1417-1428

[4] E. Blums; A. Mezulis; M. Maiorov; G. Kronkalns Thermal diffusion of magnetic nanoparticles in ferrocolloids: experiments on particle separation in vertical columns, J. Magn. Magn. Mat., Volume 169 (1997), pp. 220-228

[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

[9] E. Blums New problems of particle transfer in ferrocolloids: Soret effect and thermoosmosis, Eur. Phys. J. E - Soft Matter, Volume 15 (2004), pp. 271-276

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

[11] E. Blums; G. Kronkalns; A. Mezulis; V. Sints Non-isothermal mass transfer of ferrocolloids through porous membrane, J. Magn. Magn. Mat., Volume 323 (2011), pp. 1334-1337

[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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