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Author: search.filters.author.Rattapasakorn, S.

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    Effect of solid particle on TEHL under line contact with solid-liquid lubricant
    (2012-04-04)
    Rattapasakorn, S.
    ;
    Mongkolwongrojn, M.
    The two infinitely long surfaces in line contact under thermoelastohydrodynamic lubrication with solid-liquid lubricants were investigated. The time-dependent modified Reynolds equation elasticity equation and the adiabatic energy equation have been formulated and solved numerically with initial conditions using multi-grid multi-level method with full approximation technique. The characteristics of the two surfaces in line contact under thermoelastohydrodynamic lubrication were presented as; film pressure, film temperature and oil film thickness profiles. The results of solid-liquid lubricants with micro-particle and nano-particle under thermal elastohydrohynamic lubrication were compared with the case of pure liquid lubricant. © (2012) Trans Tech Publications, Switzerland.
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    Effects of surface roughness on elastohydrodynamic lubrication in elliptical contact with non-Newtonian fluids
    (2012-04-04)
    Rattapasakorn, S.
    ;
    Panichakorn, J.
    ;
    Mongkolwongrojn, M.
    This paper presents the effect of surface roughness on the performance characteristics of elastohydrodynamic lubrication with non-Newtonian fluid base on Carreau viscosity model in elliptical contact. The time independent modified Reynolds equation and elastic equation were formulated for compressible fluid. Perturbation method, Newton Raphson method and full adaptive multigrid method were implemented to obtain the film pressure, film thickness profiles and friction coefficient in the contact region at various amplitude of combined surface roughness, applied loads, speeds and elliptic ratio. Simulation results show surface roughness amplitude has significant affected the film pressure in the contact region. The minimum film thickness decreases but friction coefficient increases when the combined roughness and applied loads increases. The minimum film thickness and friction coefficient both increase as the relative velocity of the ball and the plate is increase. For increasing the elliptic ratio, the minimum film thickness increases but the friction coefficient decreases. © (2012) Trans Tech Publications, Switzerland.