# flow coefficient

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## flow coefficient

[¦flō ‚kō·i′fish·ənt]
(fluid mechanics)
An experimentally determined proportionality constant, relating the actual velocity of fluid flow in a pipe, duct, or open channel to the theoretical velocity expected under certain assumptions.
(mechanical engineering)
A dimensionless number used in studying the power required by fans, equal to the volumetric flow rate through the fan divided by the product of the rate of rotation of the fan and the cube of the impeller diameter.
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References in periodicals archive ?
The price of refrigeration valves varies a lot depending on the parameter, such as port size and flow coefficient etc.
Looking at the comparison between them, the procedure for the automatic flow coefficient definition seems reliable enough to get a good agreement with the 3D data.
Technical characteristics of the Dripper Flow coefficient 0.0011, 0.0016, 0.002, 0.0022 [m.sup.3] [h.sup.-1] Pressure regulation 40 - 300 kPa Pressure regulation 40 - 300 kPa, according to wall thickness Pressure regulation 13 - 25 mil, 0.33 - 0.63 mm Recommended 130 microns filtering Table 2.
 analyzed the variation law of the flow coefficient at the throttle valve with the opening degree and discussed the steady-state hydraulic power and throttling stiffness characteristics of the valve port.
To study the aerodynamic performance of air curtain during an open and closing cycle of door, Wang and Zhong (2014) applied the same concepts used by Yuill to calculate the average flow coefficient of a 2 X 2.4 m door (6.56 X 7.87 ft) (W X H)with an air-curtain unit (with no heating elements) supplying air at 15 m/s (49.29 ft/s) and 20[degrees] outward.
The parameters is these equations are: [A.sub.EZ] = drag flow coefficient of EZ type elements, [A.sub.KN] = drag flow coefficient of KN type elements, [B.sub.EZ] = pressure flow coefficient of EZ type elements, [B.sub.KN] = pressure flow coefficient of EZ type elements, K = pressure coefficient of restriction ring, [P.sub.EZ] = Pressure at the end of the section of EZ elements, [P.sub.KN] = pressure at the end of the section of KN elements before a restriction ring, L = filled length of conveying elements, [L.sub.KN] = length of the kneading zone, [eta] = melt viscosity (assumed Newtonian and isothermal).
Filippo  compared the correlations of rotordynamic characteristics with leakage formula, flow coefficient, kinetic energy carry-over coefficient, and friction factors to investigate the most accurate model for dynamic prediction.
The slope of the flow rate versus square root of the pressure differential becomes a "flow coefficient" that relates the flow rate to the square root of pressure.
The only major disadvantage of this option is that there is a limited range of valve flow coefficients ([C.sub.v] [[K.sub.v]]) available, so it is not always possible to find a valve that has the desired flow coefficient for both HW and CHW; one or the other is oversized or undersized.
Nondimensional mass parameter, flow coefficient, friction variable, and Sommerfeld number are given as
In the formula, [C.sub.q] is the flow coefficient of the orifice.

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