Examples
Examples
Try the starting example
- Reynolds number
- 100000
- Relative roughness ε/D
- 0.001
- Colebrook Darcy friction factor
- 0.022175
- Equation residual
- 0
Try another scenario
- Reynolds number
- 110000.00000000001
- Relative roughness ε/D
- 0.001
- Colebrook Darcy friction factor
- 0.021981
- Equation residual
- 0
Calculation method
Calculation method
Colebrook Darcy friction factor
Bisection on x=1/sqrt(f), x+2log10(relativeRoughness/3.7+2.51x/Re)=0.
Equation residual
Bisection on x=1/sqrt(f), x+2log10(relativeRoughness/3.7+2.51x/Re)=0.
Symbols and units
- a
- Reynolds number
- b
- Relative roughness ε/D
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Fully turbulent Colebrook model; transition/laminar regimes excluded. Supported limits: All required fields must be finite values of the exact declared type and within displayed bounds. Lists contain1–1000 finite numbers. JSON tables are numeric rectangular rows, at most100 rows and30 columns; individual tools have stricter shape/domain constraints. Fully turbulent Colebrook model; transition/laminar regimes excluded.
Are these inputs private?
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Further reading
Background reading; this does not imply endorsement or independent review of SumFizz.