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Access type: UnknownSubject: search.filters.subject.Non-Newtonian lubricant

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    Effect of nanoparticle additives on rough surface cylinder in line contact under TEHL with non-Newtonian lubricant
    (2014-01-01)
    Mongkolwongrojn, Mongkol
    ;
    Rattapasakorn, Sountaree
    This paper presents the results of a transient analysis of thermal elastohydrodynamic lubrication (TEHL) of a rough cylinder on a rough flat surface in line contact with non-Newtonian lubricant blended with Al2O 3 nanoparticles. The simultaneous systems of time-dependent modified Reynolds equation, elasticity equation and energy equation with initial conditions were solved numerically using multigrid multilevel with full approximation technique. In this study, the effect of Al2 O3 nanoparticle additives, surface roughness and sudden overload on TEHL of two surfaces in line contact were examined. The minimum film thickness and the pressure spike increase slightly with an increase in nanoparticle concentration. For TEHL with Al2 O3 nanoparticle additives, the film temperature increases very little due to thermal enhancement of nanofluids.
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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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    Theoretical characteristics of hydrodynamic journal bearings lubricated with soybean-based oil
    (2002-01-01)
    Mongkolwongrojn, M.
    ;
    Arunmetta, P.
    Vegetable-based oils are not only biodegradable but also environmentally advantageous, and the range of lubrication applications offered by them continues to grow. Recently, vegetable-based oils have been combined with synthetic esters to produce modified vegetable-based oils. This paper presents an investigation of the theoretical characteristics of hydrodynamic journal bearings lubricated with non-Newtonian soybean-based oil. The soybean-based oil was mixed with synthetic esters and silicone oil. The relationship between the shear stress and shear strain rate of the oil was obtained experimentally. The time-dependent modified Reynolds equation including non-Newtonian effects was formulated for short circular journal bearings. The perturbation technique was applied to the Reynolds equation to obtain zero- and first-order pressure equations. The finite difference method was used to calculate the pressure distribution numerically. The static and dynamic characteristics, such as pressure distribution, Sommerfeld number, attitude angle, and spring and damping coefficients, were obtained numerically. It was found that the nonlinear factors of the non-Newtonian soybean-based oil strongly affected the performance characteristics of the journal bearings.