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K_Sudden_Expansion
The K_Sudden_Expansion(d_1,d_2) function returns the resistance coefficient for an abrupt expansion flow process having the geometry shown in the figure.
The diameters, d_1 and d_2, are expected to be entered in m or ft, depending on the unit system setting in EES.
Note that the resistance coefficient is defined in terms of the velocity for the smaller pipe.
Example:
$UnitSystem SI K Pa J
$VarInfo DELTAP units=Pa
$VarInfo h_L units=m
d_1=0.025 [m]
d_2=0.10 [m]
K=k_sudden_expansion(d_1,d_2)
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=43945 [Pa]
h_L=4.481 [m]
K=0.8789
}
Reference:
Flow of Fluids Through Valves, Fittings, and Pipe, Crane Valves North America, Technical Paper No. 410M. 1979
Minor Losses Index