Evaluation of film-forming capability of refrigeration lubricants in pressurized refrigerant atmosphere

Akei, Masahiro; Mizuhara, Kazuyuki; Taki, Tokihiko; Yamamoto, Takashi

doi:10.1016/0043-1648(95)06917-8

Cited by 14 publications

(19 citation statements)

References 4 publications

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“…This work is planned in future studies. Previous studies by Akei et al (32,33) on similar lubricant/refrigerant mixtures indicate that the refractive indices of lubricants decrease slightly up to a maximum deviation of 1.7% with increasing refrigerant concentration of up to 40% by weight. Therefore, it was assumed in this study that the refractive index change due to refrigerants was negligible.…”

Section: Test Procedures and Conditionsmentioning

confidence: 99%

Elastohydrodynamic Lubrication with Polyolester Lubricants and HFC Refrigerants, Final Report, Volume 2

Günsel¹,

Pozebanchuk²

1999

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Section: Test Procedures and Conditionsmentioning

confidence: 99%

Elastohydrodynamic Lubrication with Polyolester Lubricants and HFC Refrigerants, Final Report, Volume 2

Günsel¹,

Pozebanchuk²

1999

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“…The miscibility of water-soluble PAGs and water seems highly promising as the PAGs solutions may be used as base stock of waterbased lubricants. There are several publications concerning the lubrication properties of PAGs [1,2,4,[11][12][13][14][15] but all of them are concerning the lubricating properties of pure PAGs. So far there are no publications in open literature concerning the lubricating properties of PAGs aqueous solution, and in particular their EHL behavior.…”

Section: Introductionmentioning

confidence: 99%

EHL Properties of Polyalkylene Glycols and Their Aqueous Solutions

et al. 2011

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Polyalkylene glycols (PAGs) are a type of synthetic lubricants widely used as compressor lubricants, gear oils, hydraulic fluids, and metal working fluids. The PAGs with typical molecular structure can dissolve in water, which makes it a candidate for the base stock of water-based lubricants. Till now, most of the investigations on the water-based lubrication have focussed on the additives. In this work, the potential of PAGs aqueous solutions to replace water as base stocks has been investigated. Four types of PAGs with different molecular weight and their aqueous solutions with different concentrations were studied to reveal their elastohydrodynamic lubrication (EHL) behavior. It has been found that the PAGs solutions can form EHL film like traditional oils. The film-forming capability depends on the viscosity, the pressure-viscosity coefficient, and the molecular weight of PAGs. The results indicate that the PAGs aqueous solution can be employed as base stocks of water-based lubricant.

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“…The values of the parameters (reported in Table 2) were obtained after regression of the experimental results with equation (1). The predicted viscosities using this correlation are plotted in Figure 3 together with the measured data.…”

Section: Hcfc-r123 Refrigerant Properties and Characterizationmentioning

confidence: 99%

An experimental and modeling assessment of the HCFC-R123 refrigerant capabilities for lubricating rolling EHD circular contacts

Vergne

Fillot

Bouscharain

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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This work aims at investigating the capabilities of the hydrochlorofluorocarbon (HCFC)-R123 refrigerant for lubricating rolling elastohydrodynamic circular contacts. The viscosity pressure and temperature dependence of this fluid, used in oil-free compressors, are first studied in its liquid phase. Complementary data like density variations are taken from the thermo-physics literature. Besides, film thickness measurements using a ball-on-disk tribometer equipped with an interferometry facility have been performed under pure rolling conditions. For the same operating conditions, film thickness is then predicted from a numerical elastohydrodynamic model in which the viscosity and density dependencies with pressure and temperature are described using physics-based relationships, allowing a quantitative approach. The results obtained from the full numerical model, from the analytical elastohydrodynamic film-thickness expressions, and from the experiments show an acceptable agreement. They clearly reveal that indeed refrigerants can build up a reasonable film thickness for lubricating elastohydrodynamic rolling point contacts.

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Evaluation of film-forming capability of refrigeration lubricants in pressurized refrigerant atmosphere

Cited by 14 publications

References 4 publications

Elastohydrodynamic Lubrication with Polyolester Lubricants and HFC Refrigerants, Final Report, Volume 2

Elastohydrodynamic Lubrication with Polyolester Lubricants and HFC Refrigerants, Final Report, Volume 2

EHL Properties of Polyalkylene Glycols and Their Aqueous Solutions

An experimental and modeling assessment of the HCFC-R123 refrigerant capabilities for lubricating rolling EHD circular contacts

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