Representation of service properties of fuels and lubricants as colloid-chemical systems

Lashkhi, V. L.

doi:10.1007/bf01165681

Chem Technol Fuels Oils

1996

DOI: 10.1007/bf01165681

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Representation of service properties of fuels and lubricants as colloid-chemical systems

V. L. Lashkhi¹

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“…Intermolecular interactions of different intensity take place in colloidal solutions, as in real solutions. As a result of these interactions, micelles, supramicellar formations, associates, and liquid-and solid-crystalline structures arise as a function of the external conditions and temperature [1,2].The behavior of colloidal solutions when the temperature of the system decreases is of special interest:the mobility of associates decreases sharply due to strengthening of their internal bonds and the appearance of new bonds. Based on the practical importance of such behavior, we will analyze the process of low-temperature structure formation below.…”

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Methods of nonequilibrium thermodynamics for investigating intermolecular interactions in lube oils

Solomin

Galkin

Podgornov

2008

Chem Technol Fuels Oils

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A method for experimental determination of the temperature intervals of structure formation and the activation energy of viscous flow is described on the example of lube oils. The results obtained are interpreted from the point of view of nonequilibrium thermodynamics.Lube oils, whose quality significantly affects the reliability of operation of machines and mechanisms, are considered to be complex colloidal systems. In contrast to true solutions, multiphasicity and internal heterogeneity are characteristics of such systems [1]. Intermolecular interactions of different intensity take place in colloidal solutions, as in real solutions. As a result of these interactions, micelles, supramicellar formations, associates, and liquid-and solid-crystalline structures arise as a function of the external conditions and temperature [1,2].The behavior of colloidal solutions when the temperature of the system decreases is of special interest:the mobility of associates decreases sharply due to strengthening of their internal bonds and the appearance of new bonds. Based on the practical importance of such behavior, we will analyze the process of low-temperature structure formation below. The physical analysis of the behavior of such complex multicomponent systems as petroleum disperse systems (PDS) can be performed statistically by introducing the concept of the average current energy of the intermolecular interaction in a liquid in given external conditions X:In practice, structure formation in PDS is usually investigated by viscometric methods [3]. However, these methods have a number of drawbacks, and the fundamental ones are:• usually use of an exponential dependence between the structure-sensitive parameters of a liquid (viscosity, conductivity, dielectric constant, etc.) [4,5] that characterize its structural transformation in certain conditions and the reciprocal of the temperature of the liquid; theory and experiment show that this extrapolation only holds in a narrow temperature range, outside of the region of strong structural changes [6]; • use of rotary or capillary viscometers for determining the viscosity, which causes mechanical destruction of the structures;

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confidence: 99%

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confidence: 99%

Methods of nonequilibrium thermodynamics for investigating intermolecular interactions in lube oils

Solomin

Galkin

Podgornov

2008

Chem Technol Fuels Oils

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Motor Oil Viscosity Stratification in Friction Units of Marine Diesel Motors

Sagin¹,

Semenov²

2016

American Journal of Applied Sciences

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The phenomenon of the motor oil viscosity stratification in lubricating the cylinder-piston units of marine diesel engines has been investigated. The correlations for determining the shear stress and the velocity, occurring in the liquid flow between the parallel planes, have been given. The modes of the hydrodynamic and the boundary lubrication, taking place in the cylinder assembly of the marine diesel engine operation, have been considered. The methodology has been introduced for determining the viscosity of the boundary layer, which separates the surfaces of the piston ring and that of the cylinder bushing in the marine diesel motor operation. The results of the experiments, confirming the presence of the viscosity stratification in the boundary lubrication layer of the marine motor oil, have been submitted.

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Representation of service properties of fuels and lubricants as colloid-chemical systems

Cited by 2 publications

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Methods of nonequilibrium thermodynamics for investigating intermolecular interactions in lube oils

Methods of nonequilibrium thermodynamics for investigating intermolecular interactions in lube oils

Motor Oil Viscosity Stratification in Friction Units of Marine Diesel Motors

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