Browsing by Author "Muhannad Mustafa"

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    Analysis of an oscillating squeeze flim between a rubber surface and a rigid
    (Department of Mechanical Engineering, 2007-11) Muhannad Mustafa; Mahabubur Razzaque, Dr. M.
    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.