DuctGradualContraction_CL
Returns the pressure drop associated with a gradual contraction given the fluid, its flow rate and state, the upstream and downstream diameters, and the half angle. Valid for circular duct cross-sections. This function calls the K_gradual_contraction function from the minor loss library.
DELTAP = DuctGradualContraction_CL(F$, m_dot, T, P, D_1, D_2, theta)
Inputs:
F$: fluid string identifier
m_dot: mass flow rate (kg/s, lbm/hr)
T: inlet temperature (K, C, F, or R)
P: inlet pressure (bar, atm, Pa, kPa, or MPa)
D_1: upstream duct diameter (m or ft)
D_2: downstream duct diameter (m or ft)
theta: half angle (radian or degree)
Output:
DELTAP: pressure drop (bar, atm, Pa kPa, or MPa)
Example:
$UnitSystem SI Mass J K Pa Degree
$Load Component Library
$VarInfo DP units=Pa
m_dot = 0.2 [kg/s]
T = 300 [K]
P = 100e3 [Pa]
D_1 = 0.15 [m]
D_2 = 0.1 [m]
theta = 20 [degree]
F$ = 'Air'
DP = DuctGradualContraction_CL(F$, m_dot, T, P, D_1, D_2, theta)
{Solution:
DP = 21.55 [Pa]}