Samenvatting
We present an Euler–Lagrange approach for simulating magnetoArchimedes separation of almost neutrally buoyant spherical particles in the ﬂow of a paramagnetic liquid, which is of direct relevance for separating different types of plastic by magnetic density separation.
A fourway coupled pointparticle method is employed where all relevant interactions between an external magnetic ﬁeld, a magnetic ﬂuid and discrete immersed particles are taken into account. Particle–particle interaction is modelled by a hardsphere collision model which takes the interstitial ﬂuid effects into account. First, the motion of rigid spherical particles in a paramagnetic liquid is studied in single and twoparticle systems.
We ﬁnd good agreements between our numerical results and experiments performed in a paramagnetic liquid exposed to a nonhomogeneous magnetic ﬁeld, also in the case of two colliding particles. Next, we investigate the magnetoArchimedes separation of particles with different mass densities in manyparticle systems interacting with the ﬂuid.
Our results reveal that history effects and interparticle interactions signiﬁcantly inﬂuence the levitation dynamics of particles and have a detrimental impact on the separation performance. We also investigate the effect of particle size and initial distribution on the separation performance. Results show that a reduction in the particle size from 4 to 2 mm leads to a 40 % increase in the separation time. Moreover, preseparation of particles into two groups of light and heavy particles decreases the separation time by 33 %. The presented method is shown to be a robust and efﬁcient computational framework for the investigation of particleladen ﬂows of magnetically responsive ﬂuids.
A fourway coupled pointparticle method is employed where all relevant interactions between an external magnetic ﬁeld, a magnetic ﬂuid and discrete immersed particles are taken into account. Particle–particle interaction is modelled by a hardsphere collision model which takes the interstitial ﬂuid effects into account. First, the motion of rigid spherical particles in a paramagnetic liquid is studied in single and twoparticle systems.
We ﬁnd good agreements between our numerical results and experiments performed in a paramagnetic liquid exposed to a nonhomogeneous magnetic ﬁeld, also in the case of two colliding particles. Next, we investigate the magnetoArchimedes separation of particles with different mass densities in manyparticle systems interacting with the ﬂuid.
Our results reveal that history effects and interparticle interactions signiﬁcantly inﬂuence the levitation dynamics of particles and have a detrimental impact on the separation performance. We also investigate the effect of particle size and initial distribution on the separation performance. Results show that a reduction in the particle size from 4 to 2 mm leads to a 40 % increase in the separation time. Moreover, preseparation of particles into two groups of light and heavy particles decreases the separation time by 33 %. The presented method is shown to be a robust and efﬁcient computational framework for the investigation of particleladen ﬂows of magnetically responsive ﬂuids.
Originele taal2  Engels 

Artikelnummer  A52 
Aantal pagina's  35 
Tijdschrift  Journal of Fluid Mechanics 
Volume  910 
DOI's  
Status  Gepubliceerd  22 jan. 2021 
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