def test_PSDInterpolated_discrete_range_pts():
import numpy as np
ds = [
360, 450, 562.5, 703, 878, 1097, 1371, 1713, 2141, 2676, 3345, 4181,
5226, 6532
]
ds = [i * 1e-6 for i in ds]
numbers = [
65, 119, 232, 410, 629, 849, 990, 981, 825, 579, 297, 111, 21, 1
]
psd = ParticleSizeDistribution(ds=ds, fractions=numbers, order=0)
# test fractions_discrete vs input
assert_close1d(psd.fractions_discrete(ds), psd.fractions)
# test cdf_discrete
assert_close1d(psd.cdf_discrete(ds), psd.interpolated.fraction_cdf[1:])
# test that dn solves backwards for exactly the right value
cumulative_fractions = np.cumsum(psd.fractions)
ds_for_fractions = np.array([psd.dn(f) for f in cumulative_fractions])
assert_close1d(ds, ds_for_fractions)
# test _pdf
test_pdf = psd.pdf(1e-3)
assert_close(test_pdf, 106.28284463095554)
# test _cdf
test_cdf = psd.cdf(1e-3)
assert_close(test_cdf, 0.02278897476363087)
# test _pdf_basis_integral
test_int = psd._pdf_basis_integral(1e-3, 2)
assert_close(test_int, 1.509707233427664e-08)
assert not isclose(psd.mean_size(3, 2), psd.interpolated.mean_size(3, 2))
def test_C_eccentric_orifice_ISO_15377_1998():
C = C_eccentric_orifice_ISO_15377_1998(.2, .075)
assert_close(C, 0.6351923828125)
# Does not perfectly match - like error in ISO.
D = 1.0
betas = [1e-2*i for i in range(46, 85, 1)]
Cs_expect = [0.627, 0.627, 0.627, 0.627, 0.627, 0.627, 0.627, 0.627, 0.627, 0.628, 0.628, 0.628, 0.628, 0.629, 0.629, 0.629, 0.629, 0.629, 0.629, 0.629, 0.629, 0.629, 0.628, 0.628, 0.627, 0.626, 0.625, 0.624, 0.623, 0.621, 0.620, 0.618, 0.616, 0.613, 0.611, 0.608, 0.605, 0.601, 0.597]
Cs_calc = [C_eccentric_orifice_ISO_15377_1998(D=D, Do=beta_i) for beta_i in betas]
for Ci, Cj in zip(Cs_expect, Cs_calc):
assert isclose(Ci, Cj, rel_tol=1.02e-3)
def test_control_valve_size_g():
# From [1]_, matching example 3 for non-choked gas flow with attached
# fittings and a rotary, eccentric plug, flow-to-open control valve:
Kv = size_control_valve_g(T=433.,
MW=44.01,
mu=1.4665E-4,
gamma=1.30,
Z=0.988,
P1=680E3,
P2=310E3,
Q=38 / 36.,
D1=0.08,
D2=0.1,
d=0.05,
FL=0.85,
Fd=0.42,
xT=0.60)
assert_close(Kv, 72.58664545391052)
# From [1]_, roughly matching example 4 for a small flow trim sized tapered
# needle plug valve. Difference is 3% and explained by the difference in
# algorithms used.
Kv = size_control_valve_g(T=320.,
MW=39.95,
mu=5.625E-5,
gamma=1.67,
Z=1.0,
P1=2.8E5,
P2=1.3E5,
Q=0.46 / 3600.,
D1=0.015,
D2=0.015,
d=0.015,
FL=0.98,
Fd=0.07,
xT=0.8)
assert_close(Kv, 0.016498765335995726)
# Diameters removed
Kv = size_control_valve_g(T=320.,
MW=39.95,
mu=5.625E-5,
gamma=1.67,
Z=1.0,
P1=2.8E5,
P2=1.3E5,
Q=0.46 / 3600.,
xT=0.8)
assert_close(Kv, 0.012691357950765944)
ans = size_control_valve_g(T=320.,
MW=39.95,
mu=5.625E-5,
gamma=1.67,
Z=1.0,
P1=2.8E5,
P2=1.3E5,
Q=0.46 / 3600.,
xT=0.8,
full_output=True)
assert ans['laminar'] == False
assert ans['choked'] == False
assert ans['FP'] is None
assert ans['FR'] is None
assert ans['xTP'] is None
assert ans['Rev'] is None
# Choked custom example
Kv = size_control_valve_g(T=433.,
MW=44.01,
mu=1.4665E-4,
gamma=1.30,
Z=0.988,
P1=680E3,
P2=30E3,
Q=38 / 36.,
D1=0.08,
D2=0.1,
d=0.05,
FL=0.85,
Fd=0.42,
xT=0.60)
assert_close(Kv, 70.67468803987839)
# Laminar custom example
Kv = size_control_valve_g(T=320.,
MW=39.95,
mu=5.625E-5,
gamma=1.67,
Z=1.0,
P1=2.8E5,
P2=1.3E5,
Q=0.46 / 3600.,
D1=0.015,
D2=0.015,
d=0.001,
FL=0.98,
Fd=0.07,
xT=0.8)
assert_close(Kv, 0.016498765335995726)
# Laminar custom example with iteration
Kv = size_control_valve_g(T=320.,
MW=39.95,
mu=5.625E-5,
gamma=1.67,
Z=1.0,
P1=2.8E5,
P2=2.7E5,
Q=0.1 / 3600.,
D1=0.015,
D2=0.015,
d=0.001,
FL=0.98,
Fd=0.07,
xT=0.8)
assert_close(Kv, 0.989125783445497)
# test not allowing chokes
ans_choked = size_control_valve_g(T=320.,
MW=39.95,
mu=5.625E-5,
gamma=1.67,
Z=1.0,
P1=2.8E5,
P2=1e4,
Q=0.46 / 3600.,
D1=0.015,
D2=0.015,
d=0.015,
FL=0.98,
Fd=0.07,
xT=0.8,
full_output=True,
allow_choked=True)
ans = size_control_valve_g(T=320.,
MW=39.95,
mu=5.625E-5,
gamma=1.67,
Z=1.0,
P1=2.8E5,
P2=1e4,
Q=0.46 / 3600.,
D1=0.015,
D2=0.015,
d=0.015,
FL=0.98,
Fd=0.07,
xT=0.8,
full_output=True,
allow_choked=False)
assert not isclose(ans_choked['Kv'], ans['Kv'], rel_tol=1E-4)
# Test not allowing laminar
for Kv, boolean in zip((0.001179609179354541, 0.00090739167642657),
(True, False)):
ans = size_control_valve_g(T=320.,
MW=39.95,
mu=5.625E-5,
gamma=1.67,
Z=1.0,
P1=2.8E5,
P2=1e4,
Q=1e-5,
D1=0.015,
D2=0.015,
d=0.015,
FL=0.98,
Fd=0.07,
xT=0.8,
full_output=True,
allow_laminar=boolean)
assert_close(Kv, ans['Kv'])
assert ans['choked'] # Still true even though the choke is ignored
assert ans['xTP'] is None
assert ans['Y']
assert ans['FP'] is None
assert ans['FR'] is None
assert ans['Rev']
# Test a warning is issued and a solution is still returned when in an unending loop
# Ends with C ratio converged to 0.907207790871228
args = {
'P1': 680000.0,
'full_output': True,
'allow_choked': True,
'Q': 0.24873053149856303,
'T': 433.0,
'Z': 0.9908749375670418,
'FL': 0.85,
'allow_laminar': True,
'd': 0.05,
'mu': 2.119519588834806e-05,
'MW': 44.0095,
'Fd': 0.42,
'gamma': 1.2431389717945152,
'D2': 0.1,
'xT': 0.6,
'D1': 0.08
}
ans = size_control_valve_g(P2=678000., **args)
assert ans['warning']
# Test Kv does not reach infinity
kwargs = {
'P2': 310000.0028935982,
'P1': 680000.0,
'full_output': True,
'allow_choked': True,
'T': 433.0,
'Z': 0.9896087377962123,
'FL': 0.85,
'allow_laminar': True,
'd': 0.05,
'mu': 2.119519588834806e-05,
'MW': 44.0095,
'Fd': 0.42,
'gamma': 1.2431389717945152,
'D2': 0.1,
'xT': 0.6,
'D1': 0.08
}
size_control_valve_g(Q=1000000000.0, **kwargs)