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 ?
This suggests that in the PLM, the flow coefficient K has no impact on the airflow rate and can be set to any value, such as 1.
The flow coefficient ([phi]), head coefficient ([psi]), power coefficient (r) and hydraulic Efficiency ([eta]) which is defined as the ratio between the hydraulic power transferred to the working fluid and the mechanical power introduced into the system by the impeller [13].
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.
The flow coefficient, flow exponent, and air leakage area of window of Equations 1 and 2 are used as inputs in CONTAM.
it] variable represents the interaction term to capture the difference in the cash flow coefficient between listed and private companies (private D=0, and listed company D=1).
The flow coefficient ([phi]) is formed by normalizing the volume flow to a hypothetical flow rate, where the velocity is the impeller tip speed ([omega]d/2) and the cross sectional area is the impeller's exit plane area ([pi]db):
A new modular valve body design pioneered in Burkert's latest INOX range of space saving modular valve bodies has increased the flow coefficient of a conventional angle scat valve, reducing energy requirements and improving system flow characteristics.
By definition the valve flow coefficient 'Cv' is the number of US gallons per minute of water at 60 oF that will pass through a given flow restriction with a pressure drop of one psi.
2 percent of full scale, flow range up to 500 slpm, 316 stainless steel construction, and control valve with large flow coefficient for precise control at low AP.
The Series A4 is ideal for pressure, velocity, and flow applications and includes 2 SPDT relays and a simple programming menu that allows full configuration of variables such as setpoints, dead band, engineering units, flow coefficient, duct size, and many more.
The literature on investment-cash flow regressions was criticised on the grounds that cash flow merely proxies for future investment opportunities, and thus a positive investment-cash flow coefficient does not say anything about cash constraints (Kaplan and Zingales, 1997, 2000).