The velocity of an earth satellite or other orbiting body at any given point in its orbit.
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ACCELERATION
The rate of change of velocity, as a function of time. Expressed in m/s2.
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HELIOCENTRIC PARALLAX
The difference in the apparent direction or positions of a celestial body outside the solar system, as observed from the earth and sun. Also called STELLAR PARALLAX, ANNUAL PARALLAX
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ANEMOMETER
An instrument for measuring the velocity of a fluid.
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HORIZON
The great circle of the celestial sphere midway between the zenith and nadir, or a line resembling or approximating such a circle. The line where earth and sky appear to meet, and the projection of this line upon the celestial sphere, is called the visible or apparent horizon. A line resembling the visible horizon but above or below it is called a false horizon. The circle of the celestial sphere-formed by the intersection of the celestial sphere and a plane perpendicular to the zenith-nadir line is called sensible horizon if the plane is through any point, such as the eye of an observer; geoidal horizon if through any sea-level point; and celestial or rational horizon if through the center of the earth. The geometrical horizon was originally considered identi- cal with the celestial horizon, but the expression is now more commonly used to refer to the intersection of the celestial
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TERMINAL VELOCITY
The highest sustained air stream velocity existing in the mixed air path at the end of the throw.
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PARTICLE EROSION
Occurs when fluid-entrained particles moving at high velocity pass through orifices or impinge on metering surfaces or sharp angle turns.
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CENTRIFUGAL PUMP
Pump which produces fluid velocity and converts it to pressure head.
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PARTICLE IMPINGEMENT EROSION
A particulate wear process where high velocity, fluid- entrained particles are directed at target surfaces.
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SHEAR STRESS
Frictional force overcome in sliding one layer of fluid along another, as in any fluid flow. The shear stress of a petroleum oil or other Newtonian fluid at a given temperature varies directly with shear rate (velocity). The ratio between shear stress and shear rate is constant; this ratio is termed viscosity of a Newtonian fluid, the greater the shear stress as a function of rate of shear. In a non-Newtonian fluid, such as a grease or a polymer-containing oil (e.g. multi-grade oil) - shear stress is not proportional to the rate of shear. A non-Newtonian fluid may be said to have an apparent viscosity, a viscosity that holds only for the shear rate (and temperature) at which the viscosity is determined.
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SLIP VELOCITY
The phase velocity difference between two phases.
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