Estimate Darcy friction factor explicitly with extremely accurate Romeo-Royo-Monzón approximation of Colebrook equation.
Arguments
- reynolds
Reynolds number, []. Type:
assert_double
.- roughness
relative roughness, []. Type:
assert_double
.- strict
calculate only inside the precision region. Type:
assert_flag
.
Value
Pipe friction factor, []. Type: assert_double
.
Details
Romeo's formula is reported to be extremely accurate in the region:
3.0e3 <= reynolds <= 1.5e8
0.0 <= roughness <= 0.05
In strict = TRUE
mode argument values outside this precision region
are not allowed, whereas in strict = FALSE
either NAs are
generated in that case or calculation for laminar flow is performed when
reynolds < 2100.0
.
References
Offor, U. and Alabi, S. (2016) An Accurate and Computationally Efficient Explicit Friction Factor Model. Advances in Chemical Engineering and Science, 6, pp. 237-245. doi:10.4236/aces.2016.63024 .
Eva Romeo, Carlos Royo, Antonio Monzón, Improved explicit equations for estimation of friction factor in rough and smooth pipes, Chemical Engineering Journal, Volume 86, Issue 3, 2002, Pages 369-374, ISSN 1385-8947. doi:10.1016/S1385-8947(01)00254-6 .
See also
Other Fluid properties:
fric_buzzelli()
,
fric_vatankhan()
,
re_u()