The cross-sectional area locally occupied by one of the phases of a multiphase flow, relative to the cross-sectional area of the conduit at the same local position.
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GRID TRACK
The direction of the track relative to grid north
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HELIOCENTRIC
Relative to the sun as a center
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FRICTION
The resisting force encountered at the common boundary between two bodies when, under the action of an external force, one body, moves or tends to move relative to the surface of the other.
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FRETTING
Wear phenomena taking place between two surfaces having oscillatory relative motion of small amplitude.
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INTERFACIAL TENSION (IFT)
The energy per unit area present at the boundary of two immiscible liquids. It is usually expressed in dynes/cm (ASTM Designation D 971.)
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HIGH
An area of high pressure. Since a high is, on a synoptic chart, always associated with anticyclonic circulation, the term is used interchangeably with ANTICYCLONE
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HORN ANTENNA
An antenna consisting of a waveguide the cross-sectional area of which increases toward the open end. Often shortened to HORN.
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PERMEABILITY
The relationship of flow per unit area to differential pressure across a filter medium.
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TRIBOLOGY
The science and technology of interacting surfaces in relative motion, including the study of lubrication, friction and wear. Tribological wear is wear that occurs as a result of relative motion at the surface.
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GAS-OIL-RATIO (GOR)
The gas volume flow rate, relative to the oil volume flow rate, both converted to volumes at standard pressure and temperature.
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