Contents - Index

K_Rounded_Pipe_Inlet



The K_Rounded_Pipe_Inlet(r,D) function returns the resistance coefficient for a rounded inlet.  Note that the velocity that should be used with this resistance coefficient is the velocity well beyond the inlet where the diameter is D.

The parameters, r and D, are expected to be entered in m or ft, depending on the unit system setting in EES. 

Note that the dimensional version of this function is DuctRoundedInlet_CL in the Duct Systems section of the Component Library.

Example:
$UnitSystem SI K Pa J 
$VarInfo DELTAP units=Pa
$VarInfo h_L units=m
r=0.01 [m]
D=0.10 [m]
K=k_rounded_pipe_inlet(r, D)
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=4104 [kg/m-s^2]
h_L=0.4185 [m]
K=0.08208  
}



Notes:
This function will return a value of 0.5 for a sharp-edged pipe inlet for which the curvature radius is 0.

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

Minor Losses Index