Abstract:
Squeeze film theories have often been a major area of interest in fluid mechanics. In the
present thesis, effects of surface roughness and permeability of rubber block on leakage
flow rate and hydrodynamic force developed in fluid film between a cylindrical rigid
surface and a cylindrical rubber surface are analyzed. The modified Reynolds equation,
Laplace equation and governing equation for three parameter viscoelastic model are
solved simultaneously to obtain pressure developed in fluid film between the mating
surfaces as well as in the porous matrix and viscoelastic deformation of rubber surface.
Equations are discretized into finite difference equations and solved by Gauss-Siedel
iteration. It is seen that with increasing standard deviation and center line average (CLA)
of surface height of rubber block, load carrying capacity increases significantly
developing huge hydrodynamic force in the fluid film. Leakage flow rate also decreases
with increasing standard deviation and center line average (CLA) of surface height of
rubber block. Whereas with increasing permeability of rubber block, load carrying
capacity decreases significantly but leakage flow rate decreases slightly. The present
analyses contribute to designing many engineering applications such as bearing, wet
clutch and non-contacting face seal. The results obtained from the present model are
compared with experimental results available in the literature and a very good agreement
is found.
