Title and Link to Calc:

Compressible Fluid Flow : Flow in Orifices : CFF-CRFOF-0006

Description:

Calculates Flow in a orifice similar to Example 2 in Flow of Fluids Through Valves, Fittings, and Pipe, 1988 (reprinted 12/01), Crane Co.

Alternative Descriptors:

Adiabatic flow in orifices, Discharge from orificies

Calc Number:

CFF-CRFOF-0006

Calc Status:

Beta

Reference:

(1) Flow of Fluids Through Valves, Fittings, and Pipe, 1988 (reprinted 12/01), Crane Co.

Reference Example(s) Modeled/Generalized:

Example 2 of the above reference

Calc Origination Date:

02/22/2006

Calc Originator:

RBC

Calc Revision History:

Calc Guidelines:

See the above reference

Access:

Activating this calc requires entry of the correct access code. Contact eng-calc@eng-calcs.com

Variables:

Variable Description - Description of the variable
Variable Label Description - The description of the variable as it appears in the calc.
Variable Calc Name - The calc internal variable name
Variable Units - The units for the variable
Variable Calc Upper Limit - The highest allowed value in the calc.
Variable Calc Lower Limit - The lowest allowed value in the calc.
Variable Type - Either "Output" or "Input"
Variable Format - Real Number, Text, or Integer
Variable Notes - Other comments about the variable

Variable Description: Mass flow rate from the orifice
Variable Label Description: Orifice Discharge Rate
Variable Calc Name: WRLM
Variable Units: LB/SEC
Variable Calc Upper Limit: 10000
Variable Calc Lower Limit: 0
Variable Type: Output
Variable Format: REAL
Variable Notes:

Variable Description: Orifice Downstream Pressure, measured one half pipe diameters from orifice inlet face
Variable Label Description: Orifice Downstream Pressure
Variable Calc Name: DPRE
Variable Units: PSIA
Variable Calc Upper Limit: 10000
Variable Calc Lower Limit: 0
Variable Type: Output
Variable Format: REAL
Variable Notes:

Variable Description: Net Expansion Factor
Variable Label Description: Net Expansion Factor
Variable Calc Name: NEF
Variable Units:
Variable Calc Upper Limit: 1
Variable Calc Lower Limit: 0
Variable Type: Output
Variable Format: REAL
Variable Notes:

Variable Description: Orifice Flow Coefficient
Variable Label Description: Orifice Flow Coefficient
Variable Calc Name: CV
Variable Units:
Variable Calc Upper Limit: 1.3
Variable Calc Lower Limit: 0.5
Variable Type: Output
Variable Format: REAL
Variable Notes:

Variable Description: Reynolds Number upstream of orifice (large diameter Reynolds number)
Variable Label Description: Reynolds Number at Inlet
Variable Calc Name: REY
Variable Units:
Variable Calc Upper Limit: 100000000
Variable Calc Lower Limit: 20000
Variable Type: Output
Variable Format: REAL
Variable Notes:

Variable Description: Comments
Variable Label Description: Comments
Variable Calc Name: COM
Variable Units:
Variable Calc Upper Limit:
Variable Calc Lower Limit:
Variable Type: Output
Variable Format: TEXT
Variable Notes: Displays "Input(s) out of range." if an entered input variable(s) are out of range. Displays "Output(s) out of range." if an output variable exceeds its range. The "out of range" variable(s) are displayed in yellow. The limited range values are used in the calculation, not the "out of range" value(s).

Variable Description: Upstream (Large) Pipe (inside) Diameter at Entrance of Orifice
Variable Label Description: Pipe Upstream Inside Diameter
Variable Calc Name: PID
Variable Units: IN
Variable Calc Upper Limit: 24
Variable Calc Lower Limit: 0.01
Variable Type: Input
Variable Format: REAL
Variable Notes:

Variable Description: Temperature of Fluid at Entrance of Orifice
Variable Label Description: Upstream Temperature
Variable Calc Name: UTEM
Variable Units: R
Variable Calc Upper Limit: 10000
Variable Calc Lower Limit: 1
Variable Type: Input
Variable Format: REAL
Variable Notes:

Variable Description: Viscosity of Fluid at Entrance of orifice (centipoise)
Variable Label Description: Upstream Viscosity
Variable Calc Name: VISC
Variable Units: CP
Variable Calc Upper Limit: 0.042
Variable Calc Lower Limit: 0.001
Variable Type: Input
Variable Format: REAL
Variable Notes:

Variable Description: Beta (Ratio of small to large inside diameters) of orifice to pipe (inside) diameter
Variable Label Description: Orifice Beta
Variable Calc Name: BVAL
Variable Units:
Variable Calc Upper Limit: 0.9
Variable Calc Lower Limit: 0.05
Variable Type: Input
Variable Format: REAL
Variable Notes:

Variable Description: Fluid Specific Gravity Relative to Air
Variable Label Description: Fluid Specific Gravity
Variable Calc Name: FSG
Variable Units:
Variable Calc Upper Limit: 100
Variable Calc Lower Limit: 0.01
Variable Type: Input
Variable Format: REAL
Variable Notes:

Variable Description: Orifice Upstream Pressure, measured one pipe diameter upstream of orifice inlet face
Variable Label Description: Upstream Pressure
Variable Calc Name: UPA
Variable Units: PSIA
Variable Calc Upper Limit: 10000
Variable Calc Lower Limit: 0.001
Variable Type: Input
Variable Format: REAL
Variable Notes:

Variable Description: Pressure Ratio = (UPA-DPRE)/(UPA) , Difference of Upstream Pressure & Downstream Pressure divided by the Upstream Pressure
Variable Label Description: Pressure Ratio
Variable Calc Name: DPA
Variable Units:
Variable Calc Upper Limit: 0.6
Variable Calc Lower Limit: 0
Variable Type: Input
Variable Format: REAL
Variable Notes: Cannot be greater than 0.6

Variable Description: Isentropic K
Variable Label Description: Isentropic K
Variable Calc Name: ISK
Variable Units:
Variable Calc Upper Limit: 3
Variable Calc Lower Limit: 1
Variable Type: Input
Variable Format: REAL
Variable Notes: Ratio of heat capacities (Cp to Cv)

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