Rheology of aqueous magnetite suspensions in uniform magnetic fields |
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| Institution: | 1. Instituto de Quimica, Universidade de S Paulo, São Paulo, Brazil;2. Instituto de Fisica, Univ. Federal do Rio de Janeiro, Rio de Janeiro, Brazil;1. Department of Earth Sciences, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa;2. Department of Earth and Planetary Sciences, McGill University, 3450 University Street, Montréal, QC H3A 0E8, Canada;3. University of Cape Town Department of Geological Sciences, Private Bag X3, Rondebosch 7701, South Africa;4. Western Cape Unit, Council for Geoscience, PO Box 572, Bellville 7530, South Africa;5. Computed Tomography Unit, Central Analytical Facility, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa;1. Western Cape Department of Agriculture, Outeniqua Research Farm, Private Box 249, George 6530, South Africa;2. Department of Animal Sciences, Stellenbosch University, Private Box X1, Matieland 7602, South Africa;1. Univ. Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France;2. Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Toruń, Grudziadzka 5, 87-100 Torun, Poland |
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| Abstract: | Non-magnetized suspensions of magnetite particles with concentrations in excess of 30% by mass and particle size less than 75 μm exhibit Bingham plastic behaviour. When exposed to external magnetic fields of strengths in excess of 41 × 10−4 T, the rheological behaviour of the suspensions departs from the Bingham model and can be described by a Herschel–Bulkley model of the form τ = τ0 + kγn. The value of the index n was found to range from 0.38 to 0.9, depending on the magnetic field strength, solids concentration and particle size and correlations are proposed for the apparent viscosity of magnetized suspensions as a function of magnetic field strength and solids concentration. |
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