Understanding Diesel Lubricity

Barbour, Rosaline S.; Rickeard, David J.; Elliott, N.

doi:10.4271/2000-01-1918

Cited by 62 publications

(49 citation statements)

References 7 publications

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“…It is important to indicate that this effect is opposite to the behavior of these compounds concerning their viscosity. Ihe viscosity decreases with the number of double bonds, so between the three compounds depicted in the graphic, ethyllinoleate is the one with better lubricity but worse viscosity, confirming that viscosity and lubricity not always are correlated, especially in low-sulfur fuels [1]. 20 …”

Section: Sll Humídíty Correctíon Factor (Hcf)mentioning

confidence: 91%

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Effect of fatty acid composition of methyl and ethyl esters on the lubricity at different humidities

Lapuerta

Sánchez-Valdepeñas

Bolonio

et al. 2016

Fuel

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Lubricity of individual fatty acid methyl or ethyl esters and biodiesel fuels has been measured using a high frequency reciprocating rig (HFRR). Tests have been carried out varying the ambient humidity to assess the effect of this parameter on the lubricity of the fuels. The European standard proposes a single humidity correction factor for al! the fuels, regardless their composition. lt has been proved in this study that this factor is not constant and it depends on the fu el composition. For this reason two different correlations have been proposed for the estimation of the humidity correction factor and normalized wear scar as a function of different fuel compositional characteristics. The infiuence of the water content on the lubricity and the relationship between humidity and water content ofthe fuel has been studied revealing that the effect of the air humidity is an indirect effect of the hygroscopy of the fue!.

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Section: Sll Humídíty Correctíon Factor (Hcf)mentioning

confidence: 91%

“…Ihese polar compounds are adsorbed on the rubbed metal surfaces providing a protective layer that reduces adhesion and limit friction or wear [1].…”

Section: Introduetionmentioning

confidence: 99%

Effect of fatty acid composition of methyl and ethyl esters on the lubricity at different humidities

Lapuerta

Sánchez-Valdepeñas

Bolonio

et al. 2016

Fuel

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“…This thin film is formed by adsorption of polar molecules of fuel on metal surfaces, i.e., there is a high affinity to metallic surfaces forming a thin protective metal-metal contact. The maximum permitted WSD by American and European standards is 520 µm (ASTM D 975-10) to 460 μm (EN 590 -10) to 60° C, respectively 11 . The lubricity issue is significant because of the advent of low-sulfur petrodiesel fuels and, more recently, ultralowsulfur diesel (ULSD) fuels, as required by regulations in the United States, Europe, and elsewhere.…”

Section: Introductionmentioning

confidence: 99%

Micro and nanometric wear evaluation of metal discs used on determination of biodiesel fuel lubricity

2014

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The contact of diesel fuel with engine subsystems demands a good wear resistance. Lubricity is an important feature for integrity of injection system and the sulphur composites are primarily responsible for lubrication of the injector nozzle. Biodiesel is responsible for partially restoring the lubricity of diesel fuel that presents low levels of sulphur composites and, furthermore, it causes less pollution than diesel fuel. The lubricity is measured through the wear scar diameter following the ASTM D 975 standards. However, the friction and wear with light loads of micro/nanocomponents are highly dependent on surface interactions that can be evaluated by microscopy techniques. This study aimed to measure and to analyze the biodiesel lubricity and their blends (B5, B20) with diesel by observing the wear scars of discs using the scanning electronic microscopy (SEM), atomic force microscopy (AFM) and micro roughness techniques. The fuels performance was evaluated using HFRR tribometer. The tests conditions were based on standard ADTM D-6079-04. The coefficient of friction was measure during the test. After the test, the worn ball and disc were analyzed by SEM, AFM and profilometer. The results showed that the addition of biodiesel in diesel improve the tribological performance of fuel. Also, the just WSD value is not sufficient to evaluate the lubrication ability of a fuel. Analysis of the worn disc surfaces proved to be compatible with WSD number and also more sensitive to these kinds of fuels, showing mainly the form and intensity of the wear.

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“…Refinery hydrotreating processes used to reduce sulfur levels were found to also reduce the fuel's lubricity. (172,173) This reduction in lubricity was not due to sulfur removal itself, but to simultaneous removal of trace level lubricityimparting materials during the hydrotreating processes. (174,175) Studies have shown that molecules containing hetero-atoms (O, N, and S) generally have improved lubricity compared to hydrocarbons, with oxygen-containing materials being especially effective.…”

Section: Lubricitymentioning

confidence: 99%