83.244.157.210: /* Invertibility/perfect reconstruction */

2012-12-03T15:43:32Z

Invertibility/perfect reconstruction

← Older revision		Revision as of 17:43, 3 December 2012
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	~~Hello~~. ~~Allow me introduce~~ the ~~author~~. ~~Her title~~ is ~~Refugia Shryock~~. ~~Hiring~~ is ~~her working day occupation now~~ and ~~she will not change it whenever soon~~. For a ~~whilst I've been in South Dakota~~ and ~~my mothers and fathers live nearby~~. ~~To do aerobics~~ is ~~a thing~~ that ~~I'm completely addicted~~ to.<br><br>~~Here is my webpage~~ [http://~~www~~.~~animecontent~~.~~com~~/~~blog~~/~~461505~~ www.~~animecontent~~.com]		:''In other countries, use [[Kv (flow factor)]]''

			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 [[:wikt:orifice\|orifice]], valve or other assembly and the corresponding [[volumetric flow rate\|flow rate]].

			Mathematically the flow coefficient can be expressed as:

			<math>C_v = F \sqrt{\dfrac{SG}{\Delta P}}</math>

			where:<br/>
			C<sub>v</sub> = Flow coefficient or flow capacity rating of valve.<br/>
			F = Rate of flow (US gallons per minute).<br/>
			SG = [[Specific gravity]] of fluid (Water = 1).<br/>
			ΔP = Pressure drop across valve (psi).

			In more practical terms, the ''flow coefficient'' C<sub>v</sub> is the volume (in US gallons) of water at 60°F that will flow per minute through a valve with a pressure drop of 1 psi across the valve.

			The use of the flow coefficient offers a standard method of comparing valve capacities and sizing valves for specific applications that is widely accepted by industry. The general definition of the flow coefficient can be expanded into equations modeling the flow of liquids, gases and steam as follows:

			[[Coefficient of discharge]] is the ratio of actual flow rate to theoretical discharge.

			For gas flow in a pneumatic system the C<sub>v</sub> for the same assembly can be used with a more complex equation.<ref> Swagelok C<sub>v</sub> Flow Coefficient
			[http://www.swagelok.com/downloads/webcatalogs/EN/MS-06-84.PDF "Swagelok CV Flow Coefficient"]</ref><ref>[http://generant.com/cvcalc.aspx "Generant C<sub>v</sub> Calculator"]</ref> Absolute pressures (psia) must be used for gas rather than simply differential pressure.

			For air flow at room temperature, when the outlet pressure is less than 1/2 the absolute inlet pressure, the flow becomes quite simple (although it reaches sonic velocity internally). With C<sub>v</sub> = 1.0 and 200 psia inlet pressure the flow is 100 standard cubic feet per minute (scfm). The flow is proportional to the absolute inlet pressure so that the flow in scfm would equal the C<sub>v</sub> flow coefficient if the inlet pressure were reduced to 2 psia and the outlet were connected to a vacuum with less than 1 psi absolute pressure (1.0 scfm when C<sub>v</sub> = 1.0, 2 psia input).

			==References==
			{{Reflist}}

			==External links==
			*[http://hydraulik.empass.biz/index.html#druckverlustkv_en Online-Calculation of pressure drop with flow coefficient]
			*[http://www.novanumeric.com/samples.php?CalcName=Valves Online Cv Calculator For Multiple conditions]

			{{DEFAULTSORT:Flow Coefficient}}
			[[Category:Fluid dynamics]]

en>R'n'B: Fix links to disambiguation page Matrix theory

2012-07-27T23:17:53Z

Fix links to disambiguation page Matrix theory

New page

Hello. Allow me introduce the author. Her title is Refugia Shryock. Hiring is her working day occupation now and she will not change it whenever soon. For a whilst I've been in South Dakota and my mothers and fathers live nearby. To do aerobics is a thing that I'm completely addicted to.<br><br>Here is my webpage [http://www.animecontent.com/blog/461505 www.animecontent.com]

Polyphase matrix - Revision history

83.244.157.210: /* Invertibility/perfect reconstruction */

en>R'n'B: Fix links to disambiguation page Matrix theory