The ratio between two phase velocities.
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FILTRATION (BETA) RATIO
The ratio of the number of particles greater than a given size in the influent fluid to the number of particles greater than the same size in the effluent fluid.
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ADIABATIC EFFICIENCY
The ratio of actual work output of a heat engine to the ideal output.
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BETA-RATIO (ß-RATIO)
The ratio of the number of particles greater than a given size in the influent fluid to the number of particles greater than the same size in the effluent fluid, under specified test conditions (see 'Multi-Pass Test').
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BULK MODULUS (OF ELASTICITY)
A ratio of normal stress to a change in volume. A term used in determining the compressibility of a fluid. Data for petroleum products can be found in the International Critical Tables.
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AIR-FUEL RATIO
The ratio weight, or volume, of air to fuel.
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SENSIBLE HEAT FACTOR
The ratio of sensible heat to total heat.
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POISE
A measure of viscosity (absolute viscosity) numerically equal to the force required to move a plane surface of one square centimeter per second when the surfaces are separated by a layer of fluid one centimeter in thickness. It is the ratio of the shearing stress to the shear rate of a fluid and is expressed in dyne seconds per square centimeter (DYNE SEC/CM2); 1 centipoise equals .01 poise.
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POROSITY
The ratio of pore volume to total volume of a filter medium expressed as a percent.
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MULTIPHASE FRACTION METER
A device for measuring the phase area fractions of oil, gas and water of a multiphase flow through a cross-section of a conduit.
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PHASE FLOW RATE
The amount of one phase of a multiphase flow flowing through the cross-section of a conduit in unit time. The phase flow rate may be specified as phase volume flow rate or as phase mass flow rate.
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