K_Rounded_Pipe

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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 diameters, d_1 and d_2, are expected to be entered in m or ft, depending on the unit system setting in EES.

Example:

$UnitSystem SI K Pa J
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=6289 [kg/m-s^2]
h_L=0.6413 [m]
K=0.1258
}

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, Tecnical Paper No. 410M. 1979, page A-29

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