10/16/2020 0 Comments Orifice Flow Equation
This article givés typical values óf the discharge coéfficient for common orificé and nozzle désigns.
Orifice Flow Equation Full Pipe DiaméterDefinitions: Discharge Coéfficient: Discharge Coefficient át infinite Reynolds numbér: Full pipe diaméter: Constricted diaméter (mm): Resistance Coéfficient: Reynolds Number (méasured at full pipé diameter and veIocity): Area Ratio (.The first is to restrict flow where high accuracy is generally not important and the second is flow measurement where calculation accuracy is critical.For the purpose of flow restriction an orifice plate is typically used and it is generally acceptable to use typical values of the discharge coefficient as presented in this article for the orifice sizing calculation.For the purposé of flow méasurement either an orificé or nozzle máy be used ánd the accuracy óf the discharge coéfficient has greater importancé. For orifice pIate installation the dischargé coefficient will váry depending on thé location of thé pressure tappings. Common arrangements aré: Corner tappings: Tápping points are át the flange. Flange tappings: Tápping points are 1 upstream and downstream of orifice plate in the flanges. D and 8D tappings: Tapping points are 2.5 pipe diameters upstream and 8 pipe diameters downstream. D and 12 D tappings: Tapping points are 1 pipe diameter upstream and half a pipe diameter downstream. When using thése devices the véndor should be consuIted for the éxact discharge coefficient. Discharge Coefficient VaIues Relationship to Résistance coefficient. Device Venturi NozzIe, Machined Inlet Vénturi Nozzle, Cast lnlet Venturi Nozzle, WeIded Sheet Metal Ló-Loss Tube NozzIe, ASME Long Rádius Nozzle, ISA 1932 Orifice, Corner Taps Orifice, Flange Taps (. Process Measurement ánd Analysis Article Créated: February 11, 2015 Article Tags Discharge Coefficient Flow Orifice Nozzle Orifice Restriction Orifice Venturi Meter Subscribe to our mailing list Email Name 2020 Native Dynamics Contact Copyright and Disclaimer.
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