Experimental study on viscosity of spinel-type manganese ferrite nanofluid in attendance of magnetic field

In this paper, an experimental evaluation on the viscosity of water-based manganese ferrite nanofluid with and without magnetic field with 100, 200, 300, and 400G intensities has been conducted. The Brookfield DV-I PRIME viscometer is implemented to measure the MnFe2O4/water nanofluid viscosity and to evaluate the influence of different volume concentrations (from 0.25% to 3%) and various temperatures (from 20 to 60°C) on the viscosity. According to the measurements, viscosity incrementally increases with the augmentation of nanoparticles concentration while it remarkably decreases at higher temperatures under absence and attendance of magnetic field. The maximum viscosity ratio of 1.14 is achieved at 3vol% of nanoparticles and 20°C under no magnetic field, whereas it increments to maximum viscosity ratio of 1.75 at 3vol% of nanoparticles and 40°C under 400G magnetic field. Furthermore, new correlation is proposed for determination of viscosity of MnFe2O4/water nanofluids in terms of magnetic field intensity, volume concentration and temperature. •Viscosity of spinel-type manganese ferrite nanofluids is measured.•Effect of a constant magnetic field on the viscosity is investigated.•A novel correlation is proposed for estimation of the measured viscosity.