1) Dimensionless number
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In fluid mechanics and heat transfer, the Reynolds number is a dimensionless number that gives a measure of the ratio of inertial forces () to viscous forces () and, consequently, it quantifies the relative importance of these two types of forces for given flow conditions.
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For calculations involving flow in non-circular ducts, the hydraulic diameter can be substituted for the diameter of a circular duct, with reasonable accuracy. ===Flow in a wide duct=== For a fluid moving between two plane parallel surfaces—where the width is much greater than the space between the plates—then the characteristic dimension is t...
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http://en.wikipedia.org/wiki/Reynolds_number
in fluid mechanics, a criterion of whether fluid (liquid or gas) flow is absolutely steady (streamlined, or laminar) or on the average steady with ... [4 related articles]
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http://www.britannica.com/eb/a-z/r/42
The most important dimensionless number in fluid dynamics. Reynolds number (Re) is the ratio of inertial forces to viscous forces and is given by the formula: Re = ?VD/µ where ? = density of the fluid, V = velocity, D = pipe diameter, and µ = fluid viscosity. Reynolds number is...
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Dimensionless number relating the ratio of inertial to viscous forces. Explicitly, the Reynolds number is Re=UL/\nu in which U and L are characteristic velocity and length scales, respectively, and \nu is the kinematic viscosity.
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A dimensionless number that describes the tendency for a flowing fluid, such as blood, to change from laminar flow to turbulent flow or vice versa. ... (05 Mar 2000) ...
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a dimensionless number describing the aerodynamic state of an operating aerofoil. The number is used along with the angle of attack to describe the limits of a particular aerofoil`s lift-to-drag ratio and the conditions at which stall occurs. Small wind turbine aerofoils typically operate in a low Reynolds number range, from 0.150 to 0.5 mi...
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Type: Term Pronunciation: ren′ŏldz Definitions: 1. a dimensionless number that describes the tendency for a flowing fluid, such as blood, to change from laminar flow to turbulent flow or vice versa.
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A number that represents the relative importance of viscous forces and inertial forces in a fluid as Re increases, inertial forces become more important. n sea water, Re increaseswith increasing water velocity and with the size of the object in the water
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This is a non-dimensional number (consistent units) which describes whether fluid flow is laminar, turbulent, or transitional between the two. It is significant in the design of a model of any system in which the effect of viscosity is important in controlling the velocities or the flow pattern of a fluid.whereR
e = Reynolds Number? = den...
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A non-dimensional ratio expressing conditions for similar motions in viscous fluids such as air. Comparisons of Reynolds Numbers permits comparison of wind tunnel results for small models with full-scale practice. The Reynolds Number is obtained by multiplying the density of the air by the speed and length of the model and dividing by the viscosity...
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The ratio of inertial and viscous forces in a fluid defined by the formula Re = rVD/µ, where: r = Density of fluid, µ = Viscosity in centipoise (CP), V = Velocity, and D = Inside diameter of pipe.
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In fluid mechanics, a number that indicates whether the flow of a fluid (liquid or gas) is absolutely steady (in streamlined, or laminar flow) or on the average steady with small, unsteady changes (in turbulent flow; see turbulence). The Reynolds number, abbreviated NRe or Re, has no dimensions (see dimensional analysis) and is defined as the size ...
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