roughness height

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• Roughness — is a measure of the texture of a surface. It is quantified by the vertical deviations of a real surface from its ideal form. If these deviations are large, the surface is rough; if they are small the surface is smooth. Roughness is typically… …   Wikipedia

• Roughness Length — (z 0) is a parameter which is a measure of terrain roughness as seen by surface wind. It is formally the height (in meters) at which the wind speed becomes zero when the logarithmic wind profile above the roughness sub layer is extrapolated to… …   Wikipedia

• Darcy friction factor formulae — In fluid dynamics, the Darcy friction factor formulae are equations based on experimental data and theory for the Darcy friction factor. The Darcy friction factor is a dimensionless quantity used in the Darcy–Weisbach equation, for the… …   Wikipedia

• Pipe Networks — generally refers to a common problem in Hydraulic Design. In order to direct water to many individuals in a municipal water supply, many times the water is routed through a Water supply network. A major part of this network may consist of… …   Wikipedia

• Gloss (material appearance) — Gloss is an optical property, which is based on the interaction of light with physical characteristics of a surface. It is actually the ability of a surface to reflect light into the specular direction. The factors that affect gloss are the… …   Wikipedia

• Darcy-Weisbach equation — The Darcy Weisbach equation is an important and widely used phenomenological equation in hydraulics. It relates the head loss or pressure loss due to friction along a given length of pipe to the average velocity of the fluid flow. Head loss form… …   Wikipedia

• Darcy–Weisbach equation — In fluid dynamics, the Darcy–Weisbach equation is a phenomenological equation, which relates the head loss or pressure loss due to friction along a given length of pipe to the average velocity of the fluid flow. The equation is named after Henry… …   Wikipedia

• Von Kármán constant — A unitless constant describing the logarithmic velocity profile of a turbulent fluid near a no slip boundary. The equation for such boundary layer flow profiles is:u=frac{u {star{k}lnfrac{z}{z 0}where u is the velocity at height z above the… …   Wikipedia

• FRANK A — GERMANY (see also List of Individuals) 3.2.1852 Bayreuth/D 15.10.1928 Augsburg/D Albert Frank graduated as a civil engineer from Munich Royal Technical University. He was from 1881 to 1909 there a Private Lecturer, until 1893 in hydraulic… …   Hydraulicians in Europe 1800-2000

• climate — /kluy mit/, n. 1. the composite or generally prevailing weather conditions of a region, as temperature, air pressure, humidity, precipitation, sunshine, cloudiness, and winds, throughout the year, averaged over a series of years. 2. a region or… …   Universalium

• Lapping — is a machining operation, in which two surfaces are rubbed together with an abrasive between them, by hand movement or by way of a machine.This can take two forms. The first type of lapping (traditionally called grinding), typically involves… …   Wikipedia