Abstract
This study intents to scrutinize the impact of ferrofluid in the presence of couple stress for longitudinally rough porous circular stepped plates. The influence of longitudinal surface roughness is developed using the stochastic model of Christensen and Tonder for nonzero mean, variance and skewness. Neuringer-Roseinweig model is adopted for the influence of ferrofluid. The couple stress effect is characterized by Stoke’s micro continuum theory. The modified Reynolds’ type equation is stochastically averaged and solved by no-slip boundary conditions. The closed form solutions for load bearing capacity and film pressure are obtained as a function of different parameters and plotted graphically. It is perceived that the load capacity gets elevated owing to the combined influence of magnetization and couple stress when the proper choice of roughness parameters (negatively skewed, standard deviation) is in place. Porosity and roughness (positively skewed) adversely affect bearing’s performance. The graphical and tabular analysis shows that there is a significant growth in load bearing capacity compared to the conventional lubricant case.
Highlights
A ferrofluid is a liquid that contains a colloidal suspension of ferromagnetic particles and that becomes strongly magnetized in the existence of an external magnetic field
Agrawal [5] examined the impact of porous inclined slider bearing with magnetic fluid and deduced that bearing’s life span is longer compared to the viscous porous inclined slider bearing
The couple stress impact is governed by Stokes microcontinuum [11] theory and this study discovered the advantages of couple stress fluid compared to Newtonian lubricants, such as improved
Summary
A ferrofluid is a liquid that contains a colloidal suspension of ferromagnetic particles and that becomes strongly magnetized in the existence of an external magnetic field. Bhat and Deheri [1] studied squeeze film characteristic in the curved circular disk by considering the magnetic effect and found that bearing’s load capacity is enhanced due to the magnetization parameter. Naduvinamani and Siddangouda [10] considered a couple stress fluid to study the impact of the squeeze film lubrication in circular stepped plates. The joint impact of surface roughness and couple stress on different bearing geometry is investigated by [25,26,27] and their investigations confirmed that the load capacity and squeeze film time increase due to the non-Newtonian behaviour of fluid compared to Newtonian case. It is supposed to examine the influence of ferrofluid and longitudinal surface roughness on porous circular stepped plates in the presence of couple stress
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