Interrelationship among viscosity, temperature and age of lubricant

Singh, Amit; Mukherjee, Poulami; Mishra, N.M.

doi:10.1108/00368790610640109

Cited by 10 publications

(5 citation statements)

References 4 publications

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“…Viscosity (Figure 4) of the thermally degraded oil in this study increased linearly with ageing hours, due to the build‐up of insolubles and evaporative loss of more volatile components. This linear variation of viscosity with ageing agrees with the results of Singh et al (2006). However, a decrease in the viscosity of a lubricant with respect to degradation is due to loss of shear stability of the polymeric components, like polymers used as VI improvers.…”

Section: Resultssupporting

confidence: 88%

Utilization of color change in the condition monitoring of synthetic hydraulic oils

Ossia

Hosung

Маркова

2010

Industrial Lubrication and Tribology

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PurposeThe purpose of this paper is to present an optical technique for the condition monitoring of synthetic hydraulic oil; a deviation from the current techniques based on electrical principles which could be masked by wear particles and polar contaminants in oil.Design/methodology/approachColor‐change detecting device was developed using light‐emitting diodes, optic fibers and photodiodes of three‐color‐sensing elements. Color ratio (CR) and total contamination parameters based on transmitted light intensity in red, green, and blue wavelengths were used for oil chemical and particulate contamination assessment.FindingsCR criterion was found independent of the particulate contamination of oil; but depended on chemical degradation. Total contamination index of the device depended on both the chemical degradation and particulate contamination of the oil, being most sensitive in blue wavelength, and least in the red. Test results for synthetic hydraulic oils monitored corroborated with results of viscosity, total acid number, RDE emission spectrometry, particulate counts and UV‐Vis photospectrometry. CR showed a clearer indication of oil degradation, compared to key monitoring parameters such as total acid number, viscosity, RDE emission spectrometry and particle counts.Originality/valueThis paper demonstrates how oil chemical degradation and total contamination could be detected through the device, before incipient wear occurs at tribological interfaces. The results showed that the color‐change parameters are effective criteria for the condition monitoring of synthetic hydraulic oils.

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Section: Resultssupporting

confidence: 88%

Utilization of color change in the condition monitoring of synthetic hydraulic oils

Ossia

Hosung

Маркова

2010

Industrial Lubrication and Tribology

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“…Kinematic viscosity ν (Figure 10) of the thermally degraded oil in this study varied linearly with ageing time, due to the buildup of insolubles and evaporative loss of more volatile components observed by Kaleli and Yavslioli [24]. This variation pattern of viscosity with ageing agrees with the results of Singh et al [25]. These higher molecular weight insoluble components increase the oil viscosity in the course of oil degradation.…”

Section: Viscosity and Total Acid Number (Tan)supporting

confidence: 89%

Novel Chromatic Technique Based on Optical Absorbance in Characterizing Mineral Hydraulic Oil Degradation

Ossia

Kong

2012

Advances in Tribology

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A low cost, compact, real-time, and quick measurement optical device based on the absorbance of white light, which comprised of photodiodes in a 3-element color-sensor, feedback diodes, water and temperature sensing element, and so on, was developed and tested in low absorption mineral oil. The device, a deviation from conventional electrical, mechanical, and electrochemical techniques, uses color ratio (CR) and total contamination index (TCI) parameters based on transmitted light intensity in RGB wavelengths for oil condition monitoring. Test results showed that CR corroborated CIE chromaticity (- Coordinates) and increased with oil degradation unlike Saturation and Hue . CR was found to be independent of the particulate contaminants of oil, but dependent on chemical degradation. TCI depended on both chemical degradation and particulate contaminants in oil, being most sensitive in the blue wavelength range and least in the green. Furthermore, results agreed with those of viscometry, total acid number (TAN), and UV-VIS photospectrometry. CR and TCI gave clearer indication of oil degradation than key monitoring parameters like TAN and were found to be effective criteria for characterizing the degradation of hydraulic mineral oils.

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“…Generally, after the cleaning agent is selected, the viscosity of the cleaning agent can be adjusted by changing the temperature according to the viscosity-temperature characteristic curve of the cleaning agent. For example, the cleaning agent used in the washing equipment of a certain enterprise is an isoparaffinic organic cleaning agent-Isopar L. According to the liquid viscosity-temperature characteristic equation: Vogel equation 2: [12] 𝜗 𝜗 𝑒 ⁄…”

Section: Viscosity-temperature Characteristicsmentioning

confidence: 99%

An adaptive intelligent turbulent flushing system based on Reynolds number

Song

Lu²,

Wang³

2022

International Conference on Advanced Sensing and Smart Manufacturing (ASSM 2022)

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Cleanliness is an important indicator to ensure hydraulic system effective operation. Hydraulic components flushing is a significant process to improve the cleanliness of hydraulic system. This paper studies the required conditions to keep the flushing solvent in a turbulent state and develops an adaptive intelligent flushing system and equipment based on Reynolds number and viscosity-temperature characteristic of flushing solvent. Experimental results show that the system and equipment can stably control the cleanliness of hydraulic components by adjusting the turbulent flow state of flushing solvent adaptively.

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Interrelationship among viscosity, temperature and age of lubricant

Cited by 10 publications

References 4 publications

Utilization of color change in the condition monitoring of synthetic hydraulic oils

Utilization of color change in the condition monitoring of synthetic hydraulic oils

Novel Chromatic Technique Based on Optical Absorbance in Characterizing Mineral Hydraulic Oil Degradation

An adaptive intelligent turbulent flushing system based on Reynolds number

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