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Investigation of Magnetorheological Grease Flow Under the Influence of a Magnetic Field by Aashna Raj; Chiranjit Sarkar; Piyush Kumar; Manabendra Pathak is a Chemical Engineering article available to read on EtoBox.

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In this work, we present a novel magnetohydrodynamic flow study using micro-Particle Image Velocimetry (m-PIV) in a rectangular channel under the effect of a uniform transverse magnetic field. This study is the first of its kind to explore the use of magnetorheological grease in machine components such as bearings. Rheological characterisation of grease samples establishes the non-linear relationship between the shear rate and shear stress and thus confirms the non-Newtonian behaviour of the grease. The flow follows a parabolic path away from the magnetic field. Experimental studies reveal that the flow velocities reduce considerably from 11.9 m/s to 1.7 m/s in the vicinity of the magnetic zone due to the formation of strong field-induced chains. These chains are responsible for an increase in localized yield stress of grease thereby causing a surge in the resistance to flow. Further, numerical and analytical models are developed to predict the velocity field under a magnetic field. The analytical model can accurately predict the flow velocity for different magnetic field strengths. It can be deduced that the obtained correlation is a suitable model for estimating the velocity valu

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Author

Aashna Raj; Chiranjit Sarkar; Piyush Kumar; Manabendra Pathak

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Chemical Engineering (Physical Sciences)