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Determination of viscosities of oil-refrigerant mixtures at equilibrium by means of film thickness measurements
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0003-4785-7098
1993 (English)In: ASHRAE Transactions, ISSN 0001-2505, Vol. 99, no 2, p. 1129-1136Article in journal (Refereed) Published
Abstract [en]

To be able to measure the actual film thickness in a bearing contact lubricated with oil-refrigerant mixtures, a test rig has been designed where the film thickness can be measured by optical interferometry. By calculating backward from the measured film thickness, it is possible to calculate the effective viscosity. The test rig was used to measure the effective viscosity of a polyol ester together with R-134a as a function of temperature and pressure. This paper includes comparisons between viscosity calculated from measured film thickness and viscosity measured with an oscillating bob viscometer. The apparatus was also used for investigating the effect of film thickness of flow rate and sudden changes in pressure.

Place, publisher, year, edition, pages
1993. Vol. 99, no 2, p. 1129-1136
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-4987Local ID: 3009fa40-c264-11db-9ea3-000ea68e967bOAI: oai:DiVA.org:ltu-4987DiVA, id: diva2:977861
Note
Godkänd; 1993; Bibliografisk uppgift: Proceedings of the 1993 Annual Meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineers; 20070205 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-03-09Bibliographically approved

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Höglund, Erik

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