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K_miterbend
The K_miterbend(alpha, RelRough) function returns the resistance coefficient for a miter bend of angle alpha (in degrees) as shown in the figure. The relative roughness must also be supplied as a parameter, ranging between 0 for smooth surfaces to 0.05 for very rough surfaces.
Example:
$UnitSystem SI K Pa J deg
$VarInfo DELTAP units=Pa
$VarInfo h_L units=m
RelRough=0.001
K=k_miterbend(90 [deg], RelRough)
V_tilde=10 [m/s]
rho=1000 [kg/m^3]
g=g#
h_L=K*V_tilde^2/(2*g)
DELTAP=h_L*rho*g
{Solution:
DELTAP=58081 [Pa]
h_L=5.922 [m]
K=1.162
}
Reference:
Pipe Friction Manual, Hydraulic Institute, New York, 1962
Minor Losses Index