Structural Properties and Model Rheological Parameters of an ELC Layer of Hexadecane

Popovskii, A. Yu.; Altoiz, B. А.; Butenko, Valeriy F.

doi:10.1007/s10891-019-01980-0

Cited by 5 publications

(5 citation statements)

References 6 publications

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“…This allows selecting motor oils and performing a preliminary assessment of the possibility of their use to ensure the lubrication of diesel parts. The results obtained are in good agreement with the data presented in a number of works devoted to similar studies [2,[47][48][49].…”

Section: Swot Analysis Of Research Resultssupporting

confidence: 91%

Analysis of the operation of marine diesel engines when using engine oils with different structural characteristics

Stoliaryk

2022

TAPR

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The object of research is the process of lubrication of marine trunk diesel engines. The subject of research is marine diesel engine oils, which provide lubrication, cooling and separation of friction surfaces. The analysis of the operation of marine diesel engines using motor oils with different structural characteristics is carried out. The studies are carried out on Yanmar 6EY18AL diesel engines of a Multipurpose Vessel class ship with deadweight of 27540 tons. The objective of research is to determine the effect of the structural characteristics of the oil layer (contact angle and thickness) on the performance parameters of a marine diesel engine and the performance characteristics of the oil used in its circulating lubrication system. At the same time, the compression pressure, the concentration of nitrogen oxides in the exhaust gases, and the temperature of the exhaust gases after the cylinder are considered as the operating parameters of the diesel engine; as performance characteristics of the oil – its Base Number, as well as its Wear and Contaminant Elements. The studies are carried out on two diesel engines of the same type, in the circulating lubrication system of which oils with different structural characteristics were used. Structural characteristics of the oil layer were determined by ellipsometry. The operational characteristics of the diesel engine – using the Doctor diagnostic system. Oil performance – by spectrographic analysis. It has been established that an increase in the contact angles of wetting and the thickness of the oil layer improves the heat and power and environmental performance of a diesel engine. At the same time (for the period of operation of diesel engines 500–1000 hours), the decrease in compression pressure in the cylinder slows down, the temperature of gases after the cylinder decreases, and the emission of nitrogen oxides with exhaust gases decreases. In addition, the wear of diesel parts and oil oxidation are reduced. The information obtained in the course of the study on the structural characteristics of motor oils will provide the possibility of their selection and further use of those that will contribute to a better maintenance of the operational performance of marine diesel engines.

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Section: Swot Analysis Of Research Resultssupporting

confidence: 91%

Analysis of the operation of marine diesel engines when using engine oils with different structural characteristics

Stoliaryk

2022

TAPR

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“…The results obtained are in good agreement with data provided in a number of papers devoted to similar research [65][66][67][68][69][70][71].…”

Section: Discussionsupporting

confidence: 90%

Ensuring Reliable and Safe Operation of Trunk Diesel Engines of Marine Transport Vessels

Sagin

Madey

Sagin

et al. 2022

JMSE

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In this study, a method for ensuring reliable and safe operation of marine trunk diesel engines is considered. The research was carried out on 5L23/30 MAN-B&W diesel engines of a Bulk Carrier class vessel. The objective of the study was to determine the effect of the structural characteristics of the oil layer (wetting angle and thickness) on the operational parameters of a marine diesel engine (compression pressure, concentration of nitrogen oxides in exhaust gases and temperature of exhaust gases after the cylinder) and performance characteristics of the oil (base number, wear and contaminant elements). It has been established that an increase in the degree of the contact angles of wetting and in the thickness of the oil layer improves the heat and power and environmental performance of a diesel engine. At the same time, the decrease in compression pressure in the cylinder slows down, the temperature of gases after the cylinder decreases, and the emission of nitrogen oxides with exhaust gases decreases. Also, it was found that wear of diesel parts and oil oxidation are reduced. The study confirms the possibility of improving the reliable and safe operation of trunk-type diesel engines of maritime vessels by effective control of variables relating to the characteristics of engine oil.

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“…4). in the overlapped part of the interlayer, an expression for the thickness dependence of the optical density should be Temperature dependence of the equilibrium thickness of the ELC layer of hexadecane on a metal according to impurity dichroism, e induced birefrinviscosimetry [24,27,29]. The dotted line is the approximating trend.…”

Section: ( )mentioning

confidence: 99%

“…Thinner ( 0 2 s D d < ) interlayers are homophase and contain only an orientationally ordered ELC layer. Concepts developed for analyzing the results of the rheological investigations of interlayers [24 -27] allow one to interpret the main flow characteristics using a structural-rheological model, which operates [26,27] with the values of the viscosity 0 µ and thickness of ELC layers s d . In the absence of a shear flow of liquid, the ELC layers near each of the substrates have an equilibrium thickness 0s d , and the thickness isotropic "bulk" liquid of the interlayer (viscosity vol η ) is equal to 0 2 s D d − .…”

Section: Introductionmentioning

confidence: 99%

The structure of overlapped epitropic LC

Altoiz,

Popovskii,

Butenko

2023

ФАС

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The proposed model of the structure of the wall-adjacent epitropic liquid crystalline layer considers it as an oligomeric system of thread-like associates in a non-associated liquid. The results of ELC studies of layers of aliphatic hydrocarbon - n-hexadecane are analyzed. The study of the ELC phase in n-alkanes is important both for the modification of the quantitative physical theory of this phenomenon, and in a practical sense, as it allows to solve practical problems related to the control of boundary friction in mechanisms and parts of machines. Previously, the results of rheological and structural-optical studies of the properties of these systems were considered separately, and the results obtained in the molecular-statistical model were not correlated in detail with the results of rheological measurements for the case of overlapped near-surface layers. To interpret the results of studies (by rheological and optical methods) of such a layer in interlayers of n-hexadecane, symmetrically limited by conductive substrates, it is proposed to take into account the increase in the concentration of the ordered component ("pile") under the condition that the wall layers of epitropic liquid crystals in the interlayer overlap. It will also allow to take into account the results obtained in the molecular statistical model in the processing of rheological data.

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Structural Properties and Model Rheological Parameters of an ELC Layer of Hexadecane

Cited by 5 publications

References 6 publications

Analysis of the operation of marine diesel engines when using engine oils with different structural characteristics

Analysis of the operation of marine diesel engines when using engine oils with different structural characteristics

Ensuring Reliable and Safe Operation of Trunk Diesel Engines of Marine Transport Vessels

The structure of overlapped epitropic LC

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