M.S. (Master of Science)
Department of Mechanical Engineering
In this investigation, the rheological behavior of paraffin oil containing diamagnetic suspensions is characterized under varying magnetic field conditions. The particles suspended in the white paraffin oil at mass concentrations of 0.1, 0.3, 0.5, 0.7 and 1% m/m are two-dimensional graphene nanoplatelets with an average thickness of 2 – 8 nm. Rheological experiments were conducted using a Brookfield DV2T viscometer with a modified cylindrical spindle over the range of shear rates between 192 s-1 to 1928 s-1. A Neodymium N42 ring magnet with a surface strength of 1.32 T generated the magnetic field conditions for the rheological experiments and was allowed to rotate to a maximum of 10 degrees about an axis perpendicular to the axis of rotation of the spindle. In the absence of a magnetic field and at a low mass concentration of 0.1% m/m, the graphene nanoplatelet (GNP) nanofluid behaved as a Newtonian fluid with an increased viscosity of 11% relative to the base fluid. As the mass concentrations increased to values between 0.3 - 1% m/m, these GNP nanofluids exhibited a non-Newtonian shear thinning behavior. Additional rheological experiments incorporating the effect of the magnetic field are also discussed.
Iyer, Radhika, "Investigating the Effects of Orientation Control of Graphene Nanoplatelet Suspensions by a Magnetic Field on the Viscosity of a Nanofluid System" (2018). Graduate Research Theses & Dissertations. 7220.
Northern Illinois University
Rights Statement 2
NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.