M. V. Bhat

Squeeze film based on magnetic fluid in curved porous rotating circular plates

This paper theoretically studied the effect of magnetic fluid lubricant on the action of the squeeze film formed when a curved upper plate with a porous facing approached an impermeable and flat lower plate by considering the rotation of the plates. Expressions were obtained for pressure, load capacity; and response time was given by a differential equation. All the three bearing characteristics increased when the curvature or the magnetization increased. The increase in pressure and load capacity depended only on the magnetization. However, the increase in response time depended on magnetization, fluid inertia and speed of rotation of the plates.

Ferrofluid lubrication in porous inclined slider bearing with velocity slip

The effects of slip velocity and the material constant in a porous inclined slider bearing lubricated with a ferrofluid were theoretically studied by using Jenkins model. Expressions were obtained for pressure, load capacity, friction on the slider, coefficient of friction and position of the centre of pressure. The increase in slip parameter caused decrease in load capacity as well as friction and increase in the coefficient of friction without altering the centre of pressure much. As the material constant increased, the load capacity decreased, friction and coefficient of friction increased and the position of the centre of pressure shifted slightly towards the inlet of the bearing.

Porous secant shaped slider bearing with slip velocity lubricated by ferrofluid

Ferrofluid lubrication of a porous secant shaped slider bearing was analysed considering slip velocity at the interface of film and porous regions. Expressions for various bearing characteristics were obtained. Computed values of dimensionless load capacity of the bearing, friction force on the moving slider, coefficient of friction and the position of the centre of pressure were displayed in a tabular form. The load capacity, friction and coefficient of friction decreased when the slip parameter increased. But, the load capacity as well as friction decreased and the coefficient of friction increased when the permeability parameter increased. The position of the centre of pressure was not significantly altered when the slip parameter increased. But, it slowly moved towards the inlet when the permeability parameter increased.

Analysis of a Porous Exponential Slider Bearing Lubricated with a Ferrofluid Considering Slip Velocity

A porous exponential slider bearing was studied with a ferrofluid lubricant whose flow is governed by Jenkins flow behaviour considering slip velocityat the porous interface. Expressions for dimensionless pressure, load capacity, friction on the slider, coefficient of friction and the position of the centre of pressure were obtained. Computed values were displayed in graphical from. The load capacity as well as friction decreased and the coefficient of friction increased when the slip parameter increased. But, increase in the material parameter caused decrease in load capacity and increase in friction as well as coefficient of friction. Increase in the lip parameter did not significantly affect thes position of the centre of pressure. But, it shifted towards the bearing inlet for large values of the material parameter.

Lubrication of porous parallel plate slider bearing with slip velocity, material parameter and magnetic fluid

Purpose – Our purpose was to theoretically analyse the effects of slip velocity and a magnetic fluid lubricant characterised by a material parameter on a parallel plate porous slider bearing. Various special cases were also discussed.Design/methodology/approach – The analysis might be useful in designing better slider bearings useful in machines like gas turbines.Findings – Computed values displayed in tabular form show that frictional force on the slider and the coefficient of friction decreased, the load capacity and the position of the centre of pressure unaltered when the slip parameter was increased. On the other hand, increase in the material parameter caused decrease in the frictional force and the coefficient of friction and, shift of the position of the centre of pressure towards the bearing inlet with no change in the load capacity of the bearing.Originality/value – The parallel plate slider bearing cannot support a load with a conventional lubricant. However, it can support a load with a magnet...

Ferrofluid based secant shaped slider bearing

An impermeable bearing with a secant shaped slider and a stationary stator was analysed mathematically by taking a ferrofluid lubricant whose flow followed the Jenkins flow behaviour. Expressions were obtained for various bearing characteristics. Computed values were displayed in graphical form. When the magnetization parameter was increased, load capacity of the bearing increased, coefficient of friction decreased, the position of the centre of pressure shifted towards the inlet of the bearing and the friction on the slider was unaltered. Contrary an increase in the material parameter caused decrease in load capacity, increase in friction and coefficient of friction and shift of the position of the centre of pressure towards the inlet.