def test_BVirial_Pitzer_Curl_calculus():
from sympy import symbols, Rational, diff, lambdify, integrate
# Derivatives check
# Uses SymPy
T, Tc, Pc, omega, R = symbols('T, Tc, Pc, omega, R')
Tr = T / Tc
B0 = Rational(1445, 10000) - Rational(33, 100) / Tr - Rational(
1385, 10000) / Tr**2 - Rational(121, 10000) / Tr**3
B1 = Rational(
73, 1000) + Rational(46, 100) / Tr - Rational(1, 2) / Tr**2 - Rational(
97, 1000) / Tr**3 - Rational(73, 10000) / Tr**8
# Note: scipy.misc.derivative was attempted, but found to given too
# incorrect of derivatives for higher orders, so there is no reasons to
# implement it. Plus, no uses have yet been found for the higher
# derivatives/integrals. For integrals, there is no way to get the
# indefinite integral.
# Test points in vector form for order 1, 2, and 3
# Use lambdify for fast evaluation
pts = 3 # points total = pts^4
_Ts = linspace(5, 500, pts)
_Tcs = linspace(501, 900, pts)
_Pcs = linspace(2E5, 1E7, pts)
_omegas = linspace(-1, 10, pts)
_Ts, _Tcs, _Pcs, _omegas = np.meshgrid(_Ts, _Tcs, _Pcs, _omegas)
_Ts, _Tcs, _Pcs, _omegas = _Ts.ravel(), _Tcs.ravel(), _Pcs.ravel(
), _omegas.ravel()
for order in range(1, 4):
B0c = diff(B0, T, order)
B1c = diff(B1, T, order)
Br = B0c + omega * B1c
BVirial = (Br * R * Tc / Pc).subs(R, _R)
f = lambdify((T, Tc, Pc, omega), BVirial, "numpy")
Bcalcs = f(_Ts, _Tcs, _Pcs, _omegas)
Bcalc2 = BVirial_Pitzer_Curl(_Ts, _Tcs, _Pcs, _omegas, order)
assert_close1d(Bcalcs, Bcalc2)
# Check integrals using SymPy:
for order in range(-2, 0):
B0c = B0
B1c = B1
for i in range(abs(order)):
B0c = integrate(B0c, T)
B1c = integrate(B1c, T)
Br = B0c + omega * B1c
BVirial = (Br * R * Tc / Pc).subs(R, _R)
f = lambdify((T, Tc, Pc, omega), BVirial, "numpy")
Bcalcs = f(_Ts, _Tcs, _Pcs, _omegas)
Bcalc2 = [
BVirial_Pitzer_Curl(T2, Tc2, Pc2, omega2, order)
for T2, Tc2, Pc2, omega2 in zip(_Ts, _Tcs, _Pcs, _omegas)
]
assert_close1d(Bcalcs, Bcalc2)
def test_sincos():
N = 10**1
for v in linspace(0.0, 2.0 * pi, N):
a, b = sincos(v)
assert_close(a, sin(v), rtol=1e-14)
assert_close(b, cos(v), rtol=1e-14)
for v in linspace(-100.0, 100.0, N):
a, b = sincos(v)
assert_close(a, sin(v), rtol=1e-14)
assert_close(b, cos(v), rtol=1e-14)
def test_Smith():
assert_close(Smith(.4, 800, 2.5), 0.959981235534199)
# Quick test function, to ensure results are the same regardless of
# the form of the expression
def Smith2(x, rhol, rhog):
K = 0.4
first = 1 + rhog/rhol*K*(1/x-1)
second = rhog/rhol*(1-K)*(1/x-1)
third = ((rhol/rhog + K*(1/x-1))/(1 + K*(1/x -1)))**0.5
return (first + second*third)**-1
alpha_1 = [Smith(i, 800, 2.5) for i in linspace(1E-9,.99)]
alpha_2 = [Smith2(i, 800, 2.5) for i in linspace(1E-9, .99)]
assert_close1d(alpha_1, alpha_2)
def test_NRTL_chemsep():
from thermo.interaction_parameters import IPDB
tausB = IPDB.get_ip_asymmetric_matrix('ChemSep NRTL',
['64-17-5', '7732-18-5'], 'bij')
alphaC = IPDB.get_ip_asymmetric_matrix('ChemSep NRTL',
['64-17-5', '7732-18-5'], 'alphaij')
N = 2
T = 343.15
xs = [0.252, 0.748]
tausA = tausE = tausF = tausG = tausH = alphaD = [[0.0] * N
for i in range(N)]
ABEFGHCD = (tausA, tausB, tausE, tausF, tausG, tausH, alphaC, alphaD)
GE = NRTL(T=T, xs=xs, ABEFGHCD=ABEFGHCD)
gammas = GE.gammas()
assert_close1d(gammas, [1.985383485664009, 1.146380779201308], rtol=1e-7)
# Table of values right from ChemSep
gammas_ethanol = [
5.66232, 4.283, 3.3749, 2.75365, 2.31475, 1.99622, 1.75984, 1.58121,
1.44425, 1.33807, 1.25512, 1.19003, 1.13894, 1.09896, 1.06796, 1.0443,
1.02671, 1.0142, 1.00598, 1.00142, 1
]
gammas_water = [
1, 1.00705, 1.02657, 1.05673, 1.09626, 1.14429, 1.20021, 1.26357,
1.33405, 1.41139, 1.49541, 1.58593, 1.68281, 1.78591, 1.89509, 2.0102,
2.1311, 2.25761, 2.38956, 2.52675, 2.66895
]
pts = 21
xs_ethanol = linspace(0, 1, 21)
for i in range(pts):
GE2 = GE.to_T_xs(T=T, xs=[xs_ethanol[i], 1 - xs_ethanol[i]])
gammas = GE2.gammas()
assert_close(gammas[0], gammas_ethanol[i], rtol=1e-5)
assert_close(gammas[1], gammas_water[i], rtol=1e-5)
def test_polylog2():
x = polylog2(0.5)
assert_close(x, 0.5822405264516294)
xs = linspace(0, 0.99999, 50)
# ys_act = [float(polylog(2, x)) for x in xs]
# from sympy import polylog
ys_act = [
0.0, 0.020513035768572635, 0.0412401364927588, 0.06218738124039796,
0.08336114665629184, 0.10476812813791354, 0.12641536301777412,
0.1483102559926201, 0.1704606070746889, 0.19287464238138674,
0.21556104812821067, 0.23852900824703252, 0.261788246119884,
0.2853490709994786, 0.309222429784819, 0.33341996493707843,
0.3579540794622072, 0.38283801005840257, 0.4080859097363812,
0.43371294147827794, 0.45973538481992837, 0.4861707576383267,
0.5130379559237574, 0.540357414944675, 0.5681512960135646,
0.596443704089335, 0.6252609427828415, 0.6546318150738004,
0.6845879803506546, 0.7151643814663312, 0.7463997596771124,
0.7783372810645774, 0.811025306032588, 0.8445183447984893,
0.878878258148156, 0.9141757868110273, 0.9504925291123206,
0.9879235426949309, 1.026580835488432, 1.0665981582977615,
1.108137763432647, 1.1514002456979586, 1.1966394380910048,
1.244186068718536, 1.2944877067946645, 1.3481819162579485,
1.4062463083287482, 1.4703641942000052, 1.5441353484206717,
1.644808936992927
]
ys = [polylog2(x) for x in xs]
assert_close1d(ys, ys_act, rtol=1E-7, atol=1E-10)
def func_vs_naive_tester(func,
func_naive,
T_min=1.0,
T_max=5000.0,
rho_min=1e-5,
rho_max=50000.0,
N=400,
Tc=132.6312,
rhoc=10447.7):
errs = []
rerr = 0
Ts = linspace(T_min, T_max, N)
rhoc_inv = 1.0 / rhoc
for i, T in enumerate(Ts):
tau = Tc / T
rhos = logspace(log10(rho_min), log10(rho_max), N)
for rho in rhos:
delta = rho * rhoc_inv
val = func(tau, delta)
val_naive = func_naive(tau, delta)
rerri = abs(1.0 - val / val_naive)
rerr += rerri
errs.append(rerri)
AARD, std, max_err = rerr / N**2, np.std(errs), np.max(errs)
return AARD, std, max_err
def test_turbulent_complicated():
Nu1 = turbulent_Dittus_Boelter(1E5, 1.2, True, False)
Nu2 = turbulent_Dittus_Boelter(Re=1E5,
Pr=1.2,
heating=False,
revised=False)
Nu3 = turbulent_Dittus_Boelter(Re=1E5, Pr=1.2, heating=False)
Nu4 = turbulent_Dittus_Boelter(Re=1E5, Pr=1.2)
Nu_values = [
261.3838629346147, 279.89829163640354, 242.9305927410295,
247.40036409449127
]
assert_close1d([Nu1, Nu2, Nu3, Nu4], Nu_values)
Nu1 = turbulent_Sieder_Tate(Re=1E5, Pr=1.2)
Nu2 = turbulent_Sieder_Tate(1E5, 1.2, 0.01, 0.067)
assert_close1d([Nu1, Nu2], [286.9178136793052, 219.84016455766044])
Nus = [
turbulent_entry_Hausen(1E5, 1.2, 0.154, i)
for i in linspace(1e-3, 1, 11)
]
Nus_values = [
6464.503822124652, 505.67127136455525, 399.6147653094695,
356.6182206114823, 332.39191624636305, 316.53483318707475,
305.21220965431286, 296.6521831991236, 289.91358493027764,
284.4463173972796, 279.90553997822707
]
assert_close1d(Nus, Nus_values)
def test_liquid_jet_pump_ancillary_d_mixing():
rhop=998.
rhos=1098.
Ks=0.11
Kp=.04
for rhos in [1098., 1100, 1200, 1600, 4000, 100]:
for Ks in [1E-9, 1E-3, 0.11, .5, 1, 5, 10, 100, 1000]:
for D_mult in linspace(0.1, 10, 100):
solution_vars = {'P1': 426256.1597041593,
'P2': 133600,
'Qp': 0.01,
'd_mixing': 0.045,
'd_nozzle': 0.022382858811037732}
solution_vars['d_mixing'] *= D_mult
if solution_vars['d_mixing'] < solution_vars['d_nozzle']*1.43:
continue
# Finish calculating good known values
solution_vars['Qs'] = liquid_jet_pump_ancillary(rhop=rhop, rhos=rhos, Ks=Ks, Kp=Kp, **solution_vars)
if solution_vars['Qs'].imag:
# Do not keep testing if obtained an imaginary flow rate
continue
# Try each variable with the solver
for key, value in solution_vars.items():
kwargs = dict(solution_vars)
del kwargs[key]
# print(solution_vars, key)
new_value = liquid_jet_pump_ancillary(rhop=rhop, rhos=rhos, Ks=Ks, Kp=Kp, **kwargs)
assert_close(new_value, value)
def test_VaporPressure_fitting2_dippr():
pts = 10
fit_issue_CASs = [
'75-07-0',
'107-02-8',
'108-38-3',
'7732-18-5',
'85-44-9',
'67-64-1',
'78-87-5',
'624-72-6',
'118-96-7',
'124-18-5',
# '526-73-8'
]
for CAS in fit_issue_CASs:
obj = VaporPressure(CASRN=CAS)
Ts = linspace(obj.Perrys2_8_Tmin, obj.Perrys2_8_Tmax, pts)
props_calc = [obj.calculate(T, DIPPR_PERRY_8E) for T in Ts]
res, stats = obj.fit_data_to_model(Ts=Ts,
data=props_calc,
model='DIPPR101',
do_statistics=True,
use_numba=False,
multiple_tries=True,
fit_method='lm')
assert stats['MAE'] < 1e-5
def test_VaporPressure_fitting0():
obj = VaporPressure(CASRN='13838-16-9')
Tmin, Tmax = obj.WAGNER_POLING_Tmin, obj.WAGNER_POLING_Tmax
Ts = linspace(Tmin, Tmax, 10)
Ps = [obj(T) for T in Ts]
Tc, Pc = obj.WAGNER_POLING_Tc, obj.WAGNER_POLING_Pc
fitted = obj.fit_data_to_model(Ts=Ts,
data=Ps,
model='Wagner',
use_numba=False,
model_kwargs={
'Tc': obj.WAGNER_POLING_Tc,
'Pc': obj.WAGNER_POLING_Pc
})
res = fitted
assert 'Tc' in res
assert 'Pc' in res
assert_close(res['a'], obj.WAGNER_POLING_coefs[0])
assert_close(res['b'], obj.WAGNER_POLING_coefs[1])
assert_close(res['c'], obj.WAGNER_POLING_coefs[2])
assert_close(res['d'], obj.WAGNER_POLING_coefs[3])
# Heavy compound fit
Ts = linspace(179.15, 237.15, 5)
props_calc = [Antoine(T, A=138., B=520200.0, C=3670.0) for T in Ts]
res, stats = TDependentProperty.fit_data_to_model(
Ts=Ts,
data=props_calc,
model='Antoine',
do_statistics=True,
use_numba=False,
model_kwargs={'base': 10.0},
fit_method='lm')
assert stats['MAE'] < 1e-5
# Fit with very low range and no C
Ts = linspace(374, 377.0, 5)
props_calc = [Antoine(T, A=12.852103, B=2942.98, C=0.0) for T in Ts]
res, stats = TDependentProperty.fit_data_to_model(
Ts=Ts,
data=props_calc,
model='Antoine',
do_statistics=True,
use_numba=False,
model_kwargs={'base': 10.0},
fit_method='lm')
assert stats['MAE'] < 1e-5
def test_Lastovka_Shaw_T_for_Hm_fuzz():
T_ref = 298.15
factor = 1.0
# Originally tested with 50 points in everything
similarity_variables = linspace(.05, .5, 8)
MWs = linspace(12, 1200, 8)
Hms = [-i for i in logspace(log10(1e4), log10(1), 15)] + logspace(log10(1), log10(1e7), 15)
for sv in similarity_variables:
for MW in MWs:
for Hm in Hms:
try:
Lastovka_Shaw_T_for_Hm(Hm=Hm, MW=MW, similarity_variable=sv, T_ref=T_ref)
except Exception as e:
if 'negative temperature' in str(e):
continue
def test_UNIQUAC_fitting_gamma_1_success_cases():
pts = 10
rs = [3.8254, 4.4998]
qs = [3.316, 3.856]
xs = [[xi, 1.0 - xi] for xi in linspace(1e-7, 1 - 1e-7, pts)]
gammas = [[1, 1] for i in range(pts)]
coeffs, stats = UNIQUAC.regress_binary_parameters(gammas, xs, rs, qs)
assert stats['MAE'] < 1e-5
def test_fit_cheb_poly():
eos = PR(Tc=507.6, Pc=3025000.0, omega=0.2975, T=400., P=1E6)
coeffs_linear_short = fit_cheb_poly(eos.Psat, 350, 370, 10)
for T in linspace(350, 370, 30):
assert_close(eos.Psat(T), horner(coeffs_linear_short, T), rtol=1e-9)
# Test transformation of the output only
coeffs_log_wide = fit_cheb_poly(eos.Psat, 200, 400, 15, interpolation_property=lambda x: log(x),
interpolation_property_inv=lambda x: exp(x))
for T in linspace(200, 400, 30):
assert_close(eos.Psat(T), exp(horner(coeffs_log_wide, T)), rtol=1e-9)
# Test ability to have other arguments depend on it
coeffs_linear_short_under_P = fit_cheb_poly(lambda T, P: eos.to(T=T, P=P).V_l, 350, 370, 7,
arg_func=lambda T: (eos.Psat(T)*1.1,))
for T in linspace(350, 370, 30):
P = eos.Psat(T)*1.1
assert_close(eos.to(T=T, P=P).V_l, horner(coeffs_linear_short_under_P, T), rtol=1e-9)
# Test ability to have other arguments depend on it
coeffs_log_short_above_P = fit_cheb_poly(lambda T, P: eos.to(T=T, P=P).V_g, 350, 370, 7,
arg_func=lambda T: (eos.Psat(T)*.7,),
interpolation_property=lambda x: log(x),
interpolation_property_inv=lambda x: exp(x))
for T in linspace(350, 370, 30):
P = eos.Psat(T)*0.7
assert_close(eos.to(T=T, P=P).V_g, exp(horner(coeffs_log_short_above_P, T)), rtol=1e-9)
# test interpolation_x
Tc = 750.0
coeffs_linear_short_SMK_x_trans = fit_cheb_poly(lambda T: SMK(T, Tc=Tc, omega=0.04), 200, 748, 20,
interpolation_x=lambda T: log(1. - T/Tc),
interpolation_x_inv=lambda x: -(exp(x)-1.0)*Tc)
for T in linspace(200, 748, 30):
x = log(1. - T/Tc)
assert_close(SMK(T, Tc=Tc, omega=0.04), horner(coeffs_linear_short_SMK_x_trans, x), rtol=1e-7)
# Case with one coefficient and no T bounds
assert_close1d(fit_cheb_poly(func=lambda T: 102.5, low=298.15, high=298.15, n=1), [102.5])
def test_Laliberte_heat_capacity_w():
from scipy.interpolate import interp1d
_T_array = [-15, -10, -5, 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140]
_Cp_array = [4294.03, 4256.88, 4233.58, 4219.44, 4204.95, 4195.45, 4189.1, 4184.8, 4181.9, 4180.02, 4178.95, 4178.86, 4178.77, 4179.56, 4180.89, 4182.77, 4185.17, 4188.1, 4191.55, 4195.52, 4200.01, 4205.02, 4210.57, 4216.64, 4223.23, 4230.36, 4238.07, 4246.37, 4255.28, 4264.84, 4275.08, 4286.04]
Laliberte_heat_capacity_w_interp = interp1d(_T_array, _Cp_array, kind='cubic')
for T in linspace(_T_array[0], 92.0, 1000):
assert_close(Laliberte_heat_capacity_w_interp(T),
Laliberte_heat_capacity_w(T+273.15),
rtol=1e-5)
def test_VaporPressure_linear_extrapolation_non_negative():
ethanol_psat = VaporPressure(Tb=351.39,
Tc=514.0,
Pc=6137000.0,
omega=0.635,
CASRN='64-17-5')
# Make sure the constants are set to guard against future changes to defaults
ethanol_psat.method = WAGNER_MCGARRY
ethanol_psat.interpolation_T = (lambda T: 1 / T)
ethanol_psat.interpolation_property = (lambda P: log(P))
ethanol_psat.interpolation_property_inv = (lambda P: exp(P))
ethanol_psat.extrapolation = 'linear'
assert_close(ethanol_psat(700), 59005875.32878946, rtol=1e-4)
assert_close(ethanol_psat(100), 1.0475828451230242e-11, rtol=1e-4)
assert ethanol_psat.T_limits['WAGNER_MCGARRY'][
0] == ethanol_psat.WAGNER_MCGARRY_Tmin
assert ethanol_psat.T_limits['WAGNER_MCGARRY'][
1] == ethanol_psat.WAGNER_MCGARRY_Tc
assert_close(
ethanol_psat.T_dependent_property(ethanol_psat.WAGNER_MCGARRY_Tc),
ethanol_psat.T_dependent_property(ethanol_psat.WAGNER_MCGARRY_Tc -
1e-6))
assert_close(
ethanol_psat.T_dependent_property(ethanol_psat.WAGNER_MCGARRY_Tc),
ethanol_psat.T_dependent_property(ethanol_psat.WAGNER_MCGARRY_Tc +
1e-6))
assert_close(
ethanol_psat.T_dependent_property(ethanol_psat.WAGNER_MCGARRY_Tmin),
ethanol_psat.T_dependent_property(ethanol_psat.WAGNER_MCGARRY_Tmin -
1e-6))
assert_close(
ethanol_psat.T_dependent_property(ethanol_psat.WAGNER_MCGARRY_Tmin),
ethanol_psat.T_dependent_property(ethanol_psat.WAGNER_MCGARRY_Tmin +
1e-6))
Tmin = ethanol_psat.T_limits[ethanol_psat.method][0]
Ts = linspace(0.7 * Tmin, Tmin * (1 - 1e-10), 10)
Ps = [ethanol_psat(T) for T in Ts]
# Confirms it's linear
# plt.plot(1/np.array(Ts), np.log(Ps))
# plt.show()
# def rsquared(x, y):
# import scipy.stats
# _, _, r_value, _, _ = scipy.stats.linregress(x, y)
# return r_value*r_value
# assert_close(rsquared(1/np.array(Ts), np.log(Ps)), 1, atol=1e-5)
assert abs(np.polyfit(1 / np.array(Ts), np.log(Ps), 1,
full=True)[1][0]) < 1e-13
def test_VaporPressure_fitting9_Yaws_Psat():
A, B, C, D, E, Tmin, Tmax = 53.93890302013294, -788.24, -22.734, 0.051225, 6.1896e-11, 68.15, 132.92
Ts = linspace(Tmin, Tmax, 10)
props_calc = [Yaws_Psat(T, A, B, C, D, E) for T in Ts]
res, stats = VaporPressure.fit_data_to_model(Ts=Ts,
data=props_calc,
model='Yaws_Psat',
do_statistics=True,
use_numba=False,
fit_method='lm')
assert stats['MAE'] < 1e-5
def test_ViscosityLiquid_fitting2():
# yaws points
A, B, C, D = -25.532, 3747.2, 0.0466, 0.0
Ts = linspace(489.2, 619.65)
props = [mu_Yaws(T, A, B, C, D) for T in Ts]
res, stats = ViscosityLiquid.fit_data_to_model(Ts=Ts,
data=props,
model='mu_Yaws',
do_statistics=True,
use_numba=False,
fit_method='lm')
assert stats['MAE'] < 1e-5
def test_SurfaceTension_fitting0_yaws():
A, Tc, n = 117.684, 7326.47, 1.2222
Ts = linspace(378.4, 7326.47, 10)
props_calc = [EQ106(T, Tc, A, n, 0.0, 0.0, 0.0, 0) for T in Ts]
res, stats = SurfaceTension.fit_data_to_model(Ts=Ts,
data=props_calc,
model='YawsSigma',
do_statistics=True,
use_numba=False,
model_kwargs={'Tc': Tc},
fit_method='lm')
assert stats['MAE'] < 1e-5
def test_one_phase_dP_dz_acceleration_example():
# This requires thermo!
from thermo import Stream, Vm_to_rho
from fluids import one_phase_dP, one_phase_dP_acceleration
import numpy as np
from scipy.integrate import odeint
from fluids.numerics import assert_close
P0 = 1E5
s = Stream(['nitrogen', 'methane'], T=300, P=P0, zs=[0.5, 0.5], m=1)
rho0 = s.rho
D = 0.1
def dP_dz(P, L, acc=False):
s.flash(P=float(P), Hm=s.Hm)
dPf = one_phase_dP(m=s.m,
rho=s.rhog,
mu=s.rhog,
D=D,
roughness=0,
L=1.0)
if acc:
G = 4.0 * s.m / (pi * D * D)
der = s.VolumeGasMixture.property_derivative_P(P=s.P,
T=s.T,
zs=s.zs,
ws=s.ws)
der = 1 / Vm_to_rho(der, s.MW)
factor = G * G * der
dP = dPf / (1.0 + factor)
return -dP
return -dPf
ls = linspace(0, .01)
dP_noacc = odeint(dP_dz, s.P, ls, args=(False, ))[-1]
s.flash(P=float(P0), Hm=s.Hm) # Reset the stream object
profile = odeint(dP_dz, s.P, ls, args=(True, ))
dP_acc = profile[-1]
s.flash(P=dP_acc, Hm=s.Hm)
rho1 = s.rho
dP_acc_numerical = dP_noacc - dP_acc
dP_acc_basic = one_phase_dP_acceleration(m=s.m,
D=D,
rho_o=rho1,
rho_i=rho0)
assert_close(dP_acc_basic, dP_acc_numerical, rtol=1E-4)
def test_linspace():
from fluids.numerics import linspace
calc = linspace(-3, 10, endpoint=True, num=8)
expect = np.linspace(-3, 10, endpoint=True, num=8)
assert_allclose(calc, expect)
calc = linspace(-3, 10, endpoint=False, num=20)
expect = np.linspace(-3, 10, endpoint=False, num=20)
assert_allclose(calc, expect)
calc = linspace(0, 1e-10, endpoint=False, num=3)
expect = np.linspace(0, 1e-10, endpoint=False, num=3)
assert_allclose(calc, expect)
calc = linspace(0, 1e-10, endpoint=False, num=2)
expect = np.linspace(0, 1e-10, endpoint=False, num=2)
assert_allclose(calc, expect)
calc = linspace(0, 1e-10, endpoint=False, num=1)
expect = np.linspace(0, 1e-10, endpoint=False, num=1)
assert_allclose(calc, expect)
calc, calc_step = linspace(0, 1e-10, endpoint=False, num=2, retstep=True)
expect, expect_step = np.linspace(0,
1e-10,
endpoint=False,
num=2,
retstep=True)
assert_allclose(calc, expect)
assert_allclose(calc_step, expect_step)
calc, calc_step = linspace(0, 1e-10, endpoint=False, num=1, retstep=True)
expect, expect_step = np.linspace(0,
1e-10,
endpoint=False,
num=1,
retstep=True)
assert_allclose(calc, expect)
assert isnan(calc_step)
# Cannot compare against numpy expect_step - it did not use to give nan in older versions
calc, calc_step = linspace(100, 1000, endpoint=False, num=21, retstep=True)
expect, expect_step = np.linspace(100,
1000,
endpoint=False,
num=21,
retstep=True)
assert_allclose(calc, expect)
assert_allclose(calc_step, expect_step)
def test_ThermalConductivityLiquid_fitting1_dippr100():
for i, CAS in enumerate(
chemicals.thermal_conductivity.k_data_Perrys_8E_2_315.index):
obj = ThermalConductivityLiquid(CASRN=CAS)
Ts = linspace(obj.Perrys2_315_Tmin, obj.Perrys2_315_Tmax, 10)
props_calc = [obj.calculate(T, DIPPR_PERRY_8E) for T in Ts]
res, stats = obj.fit_data_to_model(Ts=Ts,
data=props_calc,
model='DIPPR100',
do_statistics=True,
use_numba=False,
fit_method='lm')
assert stats['MAE'] < 1e-8
def _custom_set_poly_fit(self):
try:
Tmin, Tmax = self.poly_fit_Tmin, self.poly_fit_Tmax
poly_fit_coeffs = self.poly_fit_coeffs
v_Tmin = horner(poly_fit_coeffs, Tmin)
for T_trans in linspace(Tmin, Tmax, 25):
v, d1, d2 = horner_and_der2(poly_fit_coeffs, T_trans)
Psat = exp(v)
dPsat_dT = Psat * d1
d2Psat_dT2 = Psat * (d1 * d1 + d2)
A, B, C = Antoine_ABC = Antoine_coeffs_from_point(T_trans,
Psat,
dPsat_dT,
d2Psat_dT2,
base=e)
self.poly_fit_AB = list(
Antoine_AB_coeffs_from_point(T_trans,
Psat,
dPsat_dT,
base=e))
self.DIPPR101_ABC = list(
DIPPR101_ABC_coeffs_from_point(T_trans, Psat, dPsat_dT,
d2Psat_dT2))
B_OK = B > 0.0 # B is negated in this implementation, so the requirement is reversed
C_OK = -T_trans < C < 0.0
if B_OK and C_OK:
self.poly_fit_Antoine = Antoine_ABC
break
else:
continue
# Calculate the extrapolation values
v_Tmax = horner(poly_fit_coeffs, Tmax)
v, d1, d2 = horner_and_der2(poly_fit_coeffs, Tmax)
Psat = exp(v)
dPsat_dT = Psat * d1
d2Psat_dT2 = Psat * (d1 * d1 + d2)
# A, B, C = Antoine_ABC = Antoine_coeffs_from_point(T_trans, Psat, dPsat_dT, d2Psat_dT2, base=e)
self.poly_fit_AB_high = list(
Antoine_AB_coeffs_from_point(Tmax, Psat, dPsat_dT, base=e))
self.poly_fit_AB_high_ABC_compat = [
self.poly_fit_AB_high[0], -self.poly_fit_AB_high[1]
]
self.DIPPR101_ABC_high = list(
DIPPR101_ABC_coeffs_from_point(Tmax, Psat, dPsat_dT,
d2Psat_dT2))
except:
pass
def test_linspace():
from fluids.numerics import linspace
calc = linspace(-3, 10, endpoint=True, num=8)
expect = np.linspace(-3, 10, endpoint=True, num=8)
assert_allclose(calc, expect)
calc = linspace(-3, 10, endpoint=False, num=20)
expect = np.linspace(-3, 10, endpoint=False, num=20)
assert_allclose(calc, expect)
calc = linspace(0, 1e-10, endpoint=False, num=3)
expect = np.linspace(0, 1e-10, endpoint=False, num=3)
assert_allclose(calc, expect)
calc = linspace(0, 1e-10, endpoint=False, num=2)
expect = np.linspace(0, 1e-10, endpoint=False, num=2)
assert_allclose(calc, expect)
calc = linspace(0, 1e-10, endpoint=False, num=1)
expect = np.linspace(0, 1e-10, endpoint=False, num=1)
assert_allclose(calc, expect)
calc, calc_step = linspace(0, 1e-10, endpoint=False, num=2, retstep=True)
expect, expect_step = np.linspace(0,
1e-10,
endpoint=False,
num=2,
retstep=True)
assert_allclose(calc, expect)
assert_allclose(calc_step, expect_step)
calc, calc_step = linspace(0, 1e-10, endpoint=False, num=1, retstep=True)
expect, expect_step = np.linspace(0,
1e-10,
endpoint=False,
num=1,
retstep=True)
assert_allclose(calc, expect)
assert_allclose(calc_step, expect_step)
calc, calc_step = linspace(100, 1000, endpoint=False, num=21, retstep=True)
expect, expect_step = np.linspace(100,
1000,
endpoint=False,
num=21,
retstep=True)
assert_allclose(calc, expect)
assert_allclose(calc_step, expect_step)
def test_EnthalpyVaporization_fitting3_dippr_106_full():
for CAS in chemicals.phase_change.phase_change_data_Perrys2_150.index:
obj = EnthalpyVaporization(CASRN=CAS)
Ts = linspace(obj.Perrys2_150_Tmin, obj.Perrys2_150_Tmax, 8)
props_calc = [obj.calculate(T, DIPPR_PERRY_8E) for T in Ts]
res, stats = obj.fit_data_to_model(
Ts=Ts,
data=props_calc,
model='DIPPR106',
do_statistics=True,
use_numba=False,
fit_method='lm',
model_kwargs={'Tc': obj.Perrys2_150_coeffs[0]})
assert stats['MAE'] < 1e-7
def test_Permittivity_class():
# Test some cases
water = PermittivityLiquid(CASRN='7732-18-5')
assert (False, False) == (water.test_property_validity(2000),
water.test_property_validity(-10))
with pytest.raises(Exception):
water.test_method_validity(300, 'BADMETHOD')
epsilon = water.T_dependent_property(298.15)
assert_close(epsilon, 78.35530812232503)
assert PermittivityLiquid(CASRN='7732-18-5').all_methods == set(
['CRC', 'CRC_CONSTANT'])
assert PermittivityLiquid(
CASRN='132451235-2151234-1234123').all_methods == set()
assert PermittivityLiquid(
CASRN='132451235-2151234-1234123').T_dependent_property(300) is None
assert False == PermittivityLiquid(CASRN='7732-18-5').test_method_validity(
228.15, 'CRC_CONSTANT')
assert False == PermittivityLiquid(CASRN='7732-18-5').test_method_validity(
228.15, 'CRC')
# Tabular data
w = PermittivityLiquid(CASRN='7732-18-5')
Ts = linspace(273, 372, 10)
permittivities = [
87.75556413000001, 83.530500320000016, 79.48208925000003,
75.610330919999996, 71.915225330000013, 68.396772480000024,
65.05497237000003, 61.889825000000044, 58.901330369999997, 56.08948848
]
w.add_tabular_data(Ts=Ts, properties=permittivities)
assert_close(w.T_dependent_property(305.), 75.95500925000006)
w.extrapolation = 'interp1d'
assert_close(w.T_dependent_property(200.), 115.79462395999997)
w.extrapolation_coeffs.clear()
assert w.T_dependent_property(800.0) is not None
w.extrapolation = None
assert w.T_dependent_property(200.) is None
assert PermittivityLiquid.from_json(w.as_json()) == w
# Case where a nan was stored
obj = PermittivityLiquid(CASRN='57-10-3')
assert not isnan(obj.CRC_Tmin)
assert not isnan(obj.CRC_Tmax)
def test_VaporPressure_fitting5_AntoinePoling():
for i, CAS in enumerate(
chemicals.vapor_pressure.Psat_data_AntoinePoling.index):
obj = VaporPressure(CASRN=CAS)
Ts = linspace(obj.ANTOINE_POLING_Tmin, obj.ANTOINE_POLING_Tmax, 10)
props_calc = [obj.calculate(T, ANTOINE_POLING) for T in Ts]
res, stats = obj.fit_data_to_model(Ts=Ts,
data=props_calc,
model='Antoine',
do_statistics=True,
use_numba=False,
multiple_tries=True,
model_kwargs={'base': 10.0},
fit_method='lm')
assert stats['MAE'] < 1e-7
def test_EnthalpyVaporization_fitting2_dippr_106():
for i, CAS in enumerate(
chemicals.phase_change.phase_change_data_VDI_PPDS_4.index):
obj = EnthalpyVaporization(CASRN=CAS)
Ts = linspace(obj.T_limits[VDI_PPDS][0], obj.T_limits[VDI_PPDS][1], 8)
props_calc = [obj.calculate(T, VDI_PPDS) for T in Ts]
res, stats = obj.fit_data_to_model(
Ts=Ts,
data=props_calc,
model='PPDS12',
do_statistics=True,
use_numba=False,
fit_method='lm',
model_kwargs={'Tc': obj.VDI_PPDS_Tc})
assert stats['MAE'] < 1e-7
def test_VaporPressure_fitting6_VDI_PPDS():
for i, CAS in enumerate(
chemicals.vapor_pressure.Psat_data_VDI_PPDS_3.index):
obj = VaporPressure(CASRN=CAS)
Ts = linspace(obj.VDI_PPDS_Tm, obj.VDI_PPDS_Tc, 10)
props_calc = [obj.calculate(T, VDI_PPDS) for T in Ts]
res, stats = obj.fit_data_to_model(Ts=Ts,
data=props_calc,
model='Wagner',
do_statistics=True,
use_numba=False,
fit_method='lm',
model_kwargs={
'Tc': obj.VDI_PPDS_Tc,
'Pc': obj.VDI_PPDS_Pc
})
assert stats['MAE'] < 1e-7
def test_VaporPressure_fitting3_WagnerMcGarry():
for i, CAS in enumerate(
chemicals.vapor_pressure.Psat_data_WagnerMcGarry.index):
obj = VaporPressure(CASRN=CAS)
Ts = linspace(obj.WAGNER_MCGARRY_Tmin, obj.WAGNER_MCGARRY_Tc, 10)
props_calc = [obj.calculate(T, WAGNER_MCGARRY) for T in Ts]
res, stats = obj.fit_data_to_model(Ts=Ts,
data=props_calc,
model='Wagner_original',
do_statistics=True,
use_numba=False,
fit_method='lm',
model_kwargs={
'Tc': obj.WAGNER_MCGARRY_Tc,
'Pc': obj.WAGNER_MCGARRY_Pc
})
assert stats['MAE'] < 1e-7
def test_VolumeLiquid_fitting1_dippr():
fit_check_CASs = [
'124-38-9', '74-98-6', '1333-74-0', '630-08-0', '100-21-0', '624-92-0',
'624-72-6', '74-86-2', '115-07-1', '64-18-6'
]
for CAS in fit_check_CASs:
obj = VolumeLiquid(CASRN=CAS)
Ts = linspace(obj.DIPPR_Tmin, obj.DIPPR_Tmax, 8)
props_calc = [1.0 / obj.calculate(T, DIPPR_PERRY_8E) for T in Ts]
res, stats = obj.fit_data_to_model(Ts=Ts,
data=props_calc,
model='DIPPR105',
do_statistics=True,
use_numba=False,
fit_method='lm')
assert stats['MAE'] < 1e-5