Analysis of lubricity and cavitation problem of oil and refrigerant mixture for hermetic compressors

Dagilis, Vytautas; Vaitkus, Liutauras

doi:10.1016/j.ijrefrig.2017.07.006

Cited by 8 publications

(4 citation statements)

References 19 publications

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“…Processes 2021, 9, x FOR PEER REVIEW 2 of 14 have already dealt with the flow of oil through constrictions in the literature [5] and now this issue is enriched with modeling. Investigation of the development of cavitation in oil flow is described in the literature mainly concerning flow through narrow gaps such as the oil film seal with spiral grooves [6], cavitation in bearings [7] and lubricating film [8]. The literature [7] describes the detection of vapor cavitation in bearings using vibrational and acoustic methods.…”

Section: Physical Properties Of Fluidsmentioning

confidence: 99%

“…The molecular viscosity is then replaced by the so-called turbulent viscosity. The continuity Equation ( 3), the equation of motion (6) and others in the mixture model (8) will be defined for time-averaged quantities.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Investigation of the development of cavitation in oil flow is described in the literature mainly concerning flow through narrow gaps such as the oil film seal with spiral grooves [6], cavitation in bearings [7] and lubricating film [8]. The literature [7] describes the detection of vapor cavitation in bearings using vibrational and acoustic methods.…”

Section: Introductionmentioning

confidence: 99%

“…The literature [7] describes the detection of vapor cavitation in bearings using vibrational and acoustic methods. The dependence of the height of the lubricating film on the formation of cavitation is described in the literature [8]. Oil cavitation, in practice, is important in production and the literature [9] describes the production of biodiesel from used oil using hydrodynamic cavitation, and equipment using hydrodynamic cavitation to produce a highly stable oil-in-water emulsion [10].…”

Section: Introductionmentioning

confidence: 99%

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Flow of Oil and Water through the Nozzle and Cavitation

2021

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Today, the correct understanding of the issue of oil and water cavitation is important due to the growing demands on working conditions in hydraulic systems (pressure and flow rate). This article deals with the measurement and subsequent mathematical modeling of cavitation in a convergent-divergent nozzle of circular cross-section. Cavitation depends on the physical properties of the flowing medium as a function of temperature. Usually, cavitation in water is defined by a two-phase flow of water and vapor, but the air contained in the water significantly affects cavitation. There is usually no vapor cavitation in the oil. Far more often, cavitation in oil is caused by the air it contains. For comparison, cavitation in water and oil was generated in experiments with an identical nozzle. The measurement was used to define boundary conditions in mathematical models and to verify simulations. The problem of cavitation was solved by three variants of multiphase flow, single-phase flow (water, oil), two-phase flow (water–vapor, oil–air) and three-phase flow (water–vapor–air, oil–vapor–air). A turbulent model with cavitation was used for all variants. The verification of simulations shows that for water cavitation it is necessary to use a three-phase model (water, vapor, air) and for oil cavitation a two-phase model (oil, air) is sufficient. The measurement results confirm the importance of the air phase in modeling cavitation in both water and oil.

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