Publication

The effect of real gas on the properties of Herringbone Grooved Journal Bearings

Daniel Favrat, Jürg Alexander Schiffmann
2010
Journal Articles

Abstract

Driven by applications using herringbone grooved bearings lubricated with a gas operating under conditions where the perfect gas assumption is not valid, the real gas effect has been introduced into the existing narrow groove theory. The enhanced model has been linked to a rotordynamic code and to a multi-objective optimizer resulting in optimum bearing geometries that differ from the ones under the perfect gas assumption. It is suggested that rotors on bearings that have been optimized under the perfect gas assumption may get unstable if they are submitted to a lubricant that operates close to the saturation line. (C) 2010 Elsevier Ltd. All rights reserved.

Official source

https://infoscience.epfl.ch/entities/publication/1fa1fc24-67c7-4217-ab47-b8bcd6120700

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Daniel Favrat, Jürg Alexander Schiffmann
2010
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/1fa1fc24-67c7-4217-ab47-b8bcd6120700

About this result

Related concepts (17)

Ideal gas law

The ideal gas law, also called the general gas equation, is the equation of state of a hypothetical ideal gas. It is a good approximation of the behavior of many gases under many conditions, although it has several limitations. It was first stated by Benoît Paul Émile Clapeyron in 1834 as a combination of the empirical Boyle's law, Charles's law, Avogadro's law, and Gay-Lussac's law. The ideal gas law is often written in an empirical form: where , and are the pressure, volume and temperature respectively; is the amount of substance; and is the ideal gas constant.

Gas

Gas is one of the four fundamental states of matter. The others are solid, liquid, and plasma. A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g. oxygen), or compound molecules made from a variety of atoms (e.g. carbon dioxide). A gas mixture, such as air, contains a variety of pure gases. What distinguishes a gas from liquids and solids is the vast separation of the individual gas particles.

Ideal gas

An ideal gas is a theoretical gas composed of many randomly moving point particles that are not subject to interparticle interactions. The ideal gas concept is useful because it obeys the ideal gas law, a simplified equation of state, and is amenable to analysis under statistical mechanics. The requirement of zero interaction can often be relaxed if, for example, the interaction is perfectly elastic or regarded as point-like collisions.

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