Equal to the sound power level/heat release. A value used to characterize the amount of combustion noise emitted from a flame. Defined as the ratio of the acoustical power emitted from the flame to the total heat release of the flame. Approximately equal to 1 X 10-6 for premixed and turbulent flames and equal to 1 X 10-9 for diffusion and laminar flames.
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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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SLIP RATIO
The ratio between two phase velocities.
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THERMAL EFFICIENCY
Ratio of shaft work out of a system to the heat energy into the system.
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