Calculate fanno akışı, mach sayısı and boğulma length using engineering units and the defined formula.
Fanno Flow, Mach Number and Choking Length Calculator
Calculate fanno flow, mach number and choking length calculator using engineering units and the defined formula.
Result chart
Formula and calculation steps
Note: Results are for preliminary engineering evaluation. Verify assumptions, material data, safety factors, applicable standards, and manufacturer limits before final design. Tool version 2.7.1
How to use this calculator
- Enter the measurements and operating values.
- Select the correct engineering unit for each value.
- Press Calculate to view the result and intermediate values.
- Review the equation steps and download a PDF report if needed.
Equation used
4fL*/D=F(M1); F(M)=(1−M²)/(γM²)+(γ+1)/(2γ)ln[(γ+1)M²/(2+(γ−1)M²)]
How to evaluate the result
Results are for preliminary engineering evaluation. Verify assumptions, material data, safety factors, applicable standards, and manufacturer limits before final design.
Technical references
Input guide for Fanno Flow, Mach Number and Choking Length Calculator
Calculate fanno flow, mach number and choking length calculator using engineering units and the defined formula. The table below summarises the inputs and example starting values.
| Parameter | Example value | Units and description |
|---|---|---|
| Input Mach sayısı | 0.3 | Dimensionless or selection value |
| Specific ısı oranı | 1.4 | Dimensionless or selection value |
| Darcy sürtünme katsayısı | 0.02 | Dimensionless or selection value |
| Channel çapı | 50 | mm |
| Channel boyu | 20 | m |
| Input basıncı | 5 | bar(a) |
| Input sıcaklığı | 25 | °C |
Example calculation scenario
For an initial check, enter the example values from the table, select the required units, and choose Calculate. Review the main result and equation, then replace the examples with measured or design data from your system.
Common mistakes when using Fanno Flow, Mach Number and Choking Length Calculator
- Ignoring transmission efficiency, service factor, or transient operating conditions.
- Mixing unit systems without checking the selected units.
- Using example values instead of measured or design data from the actual system.
- Accepting the result without checking safety factors, duty cycle, and manufacturer limits.
Fundamental equation: 4fL*/D=F(M1); F(M)=(1−M²)/(γM²)+(γ+1)/(2γ)ln[(γ+1)M²/(2+(γ−1)M²)]
Frequently asked questions
What is Fanno Flow, Mach Number and Choking Length Calculator used for?
Calculate fanno flow, mach number and choking length calculator using engineering units and the defined formula. Use it for preliminary engineering sizing and independent result checks.
Which equation does this calculator use?
The calculation is based on 4fL*/D=F(M1); F(M)=(1−M²)/(γM²)+(γ+1)/(2γ)ln[(γ+1)M²/(2+(γ−1)M²)]. Inputs are converted according to the selected units.
Can the result be used as a final design value?
Results are for preliminary engineering evaluation. Verify assumptions, material data, safety factors, applicable standards, and manufacturer limits before final design. Confirm the result against the current standard, project specification, and manufacturer data.
