# discharge coefficient

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**Discharge coefficient**— In a nozzle or other constriction, the discharge coefficient (also known as coefficient of discharge) is the ratio of the mass flow rate at the discharge end of the nozzle to that of an ideal nozzle which expands an identical working fluid from… … Wikipedia**coefficient of discharge**— the ratio of the actual discharge to the ideal discharge, assuming unit coefficients of contraction and velocity, equal to the product of these coefficients … Useful english dictionary**coefficient of contraction**— physics : the ratio of the cross sectional area of the first vena contracta to the area of the discharge aperture … Useful english dictionary**Townsend discharge**— The Townsend discharge is a gas ionization process where an initially very small amount of free electrons, accelerated by a sufficiently strong electric field, give rise to electrical conduction through a gas by avalanche multiplication: when the … Wikipedia**Nash-Sutcliffe efficiency coefficient**— The Nash Sutcliffe model efficiency coefficient is used to assess the predictive power of hydrological models. It is defined as:E=1 frac{sum {t=1}^Tleft(Q o^t Q m^t ight)^2}{sum {t=1}^Tleft(Q o^t overline{Q o} ight)^2}where Q o is observed… … Wikipedia**Nash–Sutcliffe model efficiency coefficient**— The Nash–Sutcliffe model efficiency coefficient is used to assess the predictive power of hydrological models. It is defined as: where Qo is observed discharge, and Qm is modeled discharge. Qot is observed discharge at time t.[1] Nash–Sutcliffe… … Wikipedia**Flow coefficient**— The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. It describes the relationship between the pressure drop across an orifice, valve or other assembly and the corresponding flow rate.Coefficent of… … Wikipedia**weir coefficient**— A coefficient used in transforming water depths into discharge volumes in weir measurements [16] … Lexicon of Cave and Karst Terminology**Components of jet engines**— Diagram of a typical gas turbine jet engine. Air is compressed by the fan blades as it enters the engine, and it is mixed and burned with fuel in the combustion section. The hot exhaust gases provide forward thrust and turn the turbines which… … Wikipedia**Jet engine performance**— This article describes how jet engine performance is estimated during the design phase. Similar techniques are used once the engine has been built and is being tested, except the performance of individual components, rather than being assumed, is … Wikipedia