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K_Rounded_Pipe_Exit
The K_Rounded_Pipe_Exit(S$) function returns the resistance coefficient for a rounded exit for laminar or turbulent flow. S$ should either be 'Laminar' or 'Turbulent'.
Example:
$UnitSystem SI K Pa J
$VarInfo DELTAP units=Pa
$VarInfo h_L units=m
K=K_Rounded_Pipe_Exit('Laminar')
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=100000 [Pa]
h_L=10.2 [m]
K=2
}
Notes:
The resistance coefficient is nearly independent of the radius of curvature and so it has the same value as the sharp-edged exit.
Reference:
Cengel and Cimbala, Fluid Mechanics, Fundamentals and Applications,McGraw-Hill, 2006
Page A-29 of Crane, "Flow of Fluids through Valves, Fittings and pipe", Technical Paper No. 410M, Crane Co, NY, 1979
Minor Losses Index