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Access type: UnknownSubject: search.filters.subject.Modified Reynolds equation

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    Analysis of a flexible web on a grooved concave surface under softEHL
    (2013-02-18)
    Mongkolwongrojn, Mongkol
    ;
    Jeenkour, Puttha
    This article describes characteristics of a flexible web moving through a grooved, concave, and soft surface in an elastohydrodynamic lubrication. Both trapezoidal and semi-elliptical grooved surfaces have been investigated under air lubrication. The modified Reynolds equation based on the first-order boundary slip and permeability of a soft bearing material has been formulated and solved numerically to obtain a traction characteristics between a polypropylene web and a grooved concave surface in the contact region. The concave shape was mainly considered under varying depths of grooves, flexible web velocities, normal loads, equivalent Young's moduli, curvatures and material permeability values. The simulation results are compared between friction coefficient for a trapezoidal grooved concave surface and a semi-elliptical grooved surface. © 2013 Elsevier Ltd.
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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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    Analysis of two surfaces in line contact under TEHL with non-Newtonian lubricants
    (2012-01-18)
    Sountaree, Rattapasakorn
    ;
    Mongkol, Mongkolwongrojn
    This paper presents the static characteristics of two surfaces in line contact under TEHL with non-Newtonian lubricant. Modified Reynolds equation, elastic equation and energy equation were formulated to obtain the model. The model was simulated based on numerical method by using Newton-Raphson and multigrid multilevel techniques. The static characteristics of the two surfaces in line contact under TEHL such as film pressure, film thickness and film temperature profiles in the contact region were examined at various loads, speeds, roller radius and elastic modulus respectively. The results showed the significant effect of load, elastic modulus and surface velocity on the TEHL for machine element operated at severe conditions. © (2012) Trans Tech Publications, Switzerland.
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