Ajith, K.Pillai, Archana SumohanMuthu Vijayan Enoch, I.V.Sharifpur, MohsenSolomon, A. BruslyMeyer, Josua P.2022-05-062021-11Ajith, K., Pillai, A.S., Muthu Vijayan Enoch, I.V. et al. 2021, 'Effect of the non-electrically conductive spindle on the viscosity measurements of nanofluids subjected to the magnetic field', Colloids and Surfaces A: Physicochemical and Engineering Aspects, vol. 628, art. 127252, pp. 1-10, doi : 10.1016/j.colsurfa.2021.127252.0927-7757 (print)1873-4357 (online)10.1016/j.colsurfa.2021.127252https://repository.up.ac.za/handle/2263/85145The viscosity measurements of magnetic nanofluid subjected to the magnetic field are indispensable in various heat transfer studies. Intention of the present discussion is to critically analyze the magnetic field's influence on the working of two viscometers; a Glass capillary viscometer and a DV-E Brookfield viscometer. The novelty of the present study is in the identification of the underlying reason for the massive escalation in viscosity when the magnetic nanofluid is subjected to magnetic field and rectification of the error caused. The stainless-steel spindle in the viscometer is replaced with a non-electrically and non-magnetically conductive nylon spindle to rectify the error. The dynamic viscosity of magnesium ferrite nanofluid of different volume fractions at a temperature of 25 °C in the occurrence of magnetic field was measured. The viscosity of magnetic nanofluid measured using DV-E Brookfield viscometer escalated to a maximum of 725% over the same measured using glass capillary viscometer with the magnetic field application. The application of the nylon spindle in the viscometer eliminates the error caused due to the eddy current formation in the spindle. Therefore, this study recommends using viscometers with non-electrically and non-magnetically conductive spindles for accuracy while measuring the viscosity of magnetic fluids.en© 2021 Elsevier B.V. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Colloids and Surfaces A: Physicochemical and Engineering Aspects. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Colloids and Surfaces A: Physicochemical and Engineering Aspects, vol. 628, art. 127252, pp. 1-10, 2021. doi : 10.1016/j.colsurfa.2021.127252.Erroneous viscosityMagnetic nanofluidMagnetic field (MGF)Glass capillary viscometerEngineering, built environment and information technology articles SDG-04SDG-04: Quality educationEngineering, built environment and information technology articles SDG-07SDG-07: Affordable and clean energyEngineering, built environment and information technology articles SDG-09SDG-09: Industry, innovation and infrastructureEngineering, built environment and information technology articles SDG-12SDG-12: Responsible consumption and productionPostprint Article