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K_45deg_elbow



The K_45deg_elbow(RelRough) function returns the resistance coefficient for a 45 degree elbow.  The relative roughness must also be supplied as a parameter.  This parameter can range between 0 (for smooth tubes) to 0.05 (for very rough tubes.)  The dependence of relative roughness indicates that the resistance factor is applicable to turbulent flow.

Example:
$UnitSystem SI K Pa J 
$VarInfo DELTAP units=Pa
$VarInfo h_L units=m
RelRough=0
K=k_45deg_elbow(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=4822 [kg/m-s^2]
h_L=0.4917 [m]
K=0.09644 
}

Reference:
Flow of Fluids Through Valves, Fittings, and Pipe, Crane Valves North America, Technical Paper No. 410M. 1979, p A-29


Minor Losses Index