Study on the Effect of Micropolar Fluids on the Squeeze Film Elliptical Plates

2021 ◽  
pp. 13-21
Author(s):  
Roopa R. Anagod
Keyword(s):  
Squeeze Film ◽  
Micropolar Fluids

Stochastic Reynolds equation for the combined effects of piezo-viscous dependency and squeeze-film lubrication of micropolar fluids on rough porous circular stepped plates

2021 ◽  
pp. 135065012110224
Author(s):  
Hanumagowda Bannihalli Naganagowda ◽  
Sreekala Cherkkarathandayan Karappan
Keyword(s):  
Carrying Capacity ◽  
Stochastic Approach ◽  
Squeeze Film ◽  
Closed Form Expression ◽  
Load Carrying Capacity ◽  
Micropolar Fluids ◽  
Pressure Dependent Viscosity ◽  
Load Carrying ◽  
Dependent Viscosity ◽  
Film Characteristics

The aim of this paper is to presents a theoretical analysis on squeeze-film characteristics of a rough porous circular stepped plate in the vicinity of pressure-dependent viscosity and lubrication by micropolar fluids. A closed-form expression for non-dimensional pressure, load, and squeezing time is derived based on Eringen’s theory, Darcy’s equation, and Christensen’s stochastic approach. Results indicate that the effects of pressure-dependent viscosity, surface roughness, and micropolar fluids play an important role in increasing the load-carrying capacity and squeezing time, whereas the presence of porous media decreases the load-carrying capacity and squeezing time of the rough porous circular stepped plates.

Non-Newtonian Micropolar Fluid Squeeze Film Between Conical Plates

2012 ◽  
Vol 67 (6-7) ◽  
pp. 333-337 ◽  
Author(s):  
Jaw-Ren Lin ◽  
Chia-Chuan Kuo ◽  
Won-Hsion Liao ◽  
Ching-Been Yang
Keyword(s):  
Micropolar Fluid ◽  
Reynolds Equation ◽  
Fluid Model ◽  
Load Capacity ◽  
Numerical Results ◽  
Squeeze Film ◽  
Micropolar Fluids ◽  
Newtonian Case ◽  
Film Characteristics ◽  
Film Lubrication

By applying the micropolar fluid model of Eringen (J. Math. Mech. 16, 1 (1966) and Int. J. Mech. Sci. 31, 605 (1993)), the squeeze film lubrication problems between conical plates are extended in the present paper. A non-Newtonian modified Reynolds equation is derived and applied to obtain the solution of squeeze film characteristics. Comparing with the traditional Newtonian case, the non-Newtonian effects of micropolar fluids are found to enhance the load capacity and lengthen the approaching time of conical plates. Some numerical results are also provided in tables for engineer applications

Squeeze Film Theory for Micropolar Fluids

1976 ◽  
Vol 98 (1) ◽  
pp. 139-144 ◽  
Author(s):  
J. Prakash ◽  
P. Sinha
Keyword(s):  
Thin Films ◽  
Flow Behavior ◽  
Film Theory ◽  
Continuum Theory ◽  
Squeeze Film ◽  
Micropolar Fluids ◽  
Fluid Theory ◽  
Film Characteristics ◽  
Analytical Expressions ◽  
Circular Disks

Needs’ experimental results on thin films deviate considerably from those predicted by the classical theory when the film thickness is less than 0.00127 mm. In recent years there has been a tendency to attribute this deviation to the inadequacy of the classical continuum theory to describe the fluid flow behavior when confined to narrow passages. In this paper the micropolar fluid theory is applied to the squeeze films for circular disks to explain Needs’ findings. An excellent qualitative agreement is found to exist between the results based on this analysis and Needs’ results. Analytical expressions are obtained for various squeeze film characteristics and effect of microstructure elaborated through graphs.

scholarly journals Combined Effects of Viscosity Variation and Surface Roughness on the Squeeze Film Lubrication of Journal Bearings with Micropolar Fluids

2014 ◽  
Vol 9 (4) ◽  
pp. 175-183 ◽  
Author(s):  
Neminath Bhujappa Naduvinamani ◽  
Siddangouda Apparao ◽  
Archana Kamalakar Kadadi ◽  
Shivaraj Nagshetty Biradar
Keyword(s):  
Surface Roughness ◽  
Journal Bearings ◽  
Squeeze Film ◽  
Combined Effects ◽  
Micropolar Fluids ◽  
Viscosity Variation ◽  
Film Lubrication

Analytical analysis of a rigid rotor mounted on three hydrostatic pads lubricated with micropolar fluids

2018 ◽  
Vol 233 (6) ◽  
pp. 859-869 ◽  
Author(s):  
Aboubakeur Benariba ◽  
Ahmed Bouzidane ◽  
Marc Thomas
Keyword(s):  
Critical Speed ◽  
Reynolds Equation ◽  
Squeeze Film ◽  
Rigid Rotor ◽  
Micropolar Fluids ◽  
Analytical Analysis ◽  
Squeeze Film Damper ◽  
High Speeds ◽  
Vibratory Response ◽  
Micropolar Lubrication

Analytical analysis of rigid rotor set vertically, supported by a new hydrostatic squeeze film damper consisting in three hydrostatic pads fed through three capillary restrictors operating with micropolar lubricant is presented. The modified Reynolds equation is obtained using the micropolar lubrication theory and solving it analytically. The calculation of the flow rate, dimensionless vibratory amplitude and amplitude of transmitted forces are determined by resolving the equations of rotor motion using nonlinear methods. It has been observed that a rigid rotor operating with micropolar lubricant shows an increase in the value of transmitted forces at high speeds and a reduction in the value of vibratory response at critical speed when compared to a corresponding similar rigid rotor operating with Newtonian lubricant.

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