rmgpy.kinetics.Arrhenius¶
- class rmgpy.kinetics.Arrhenius(A=None, n=0.0, Ea=None, T0=(1.0, 'K'), Tmin=None, Tmax=None, Pmin=None, Pmax=None, uncertainty=None, comment='')¶
A kinetics model based on the (modified) Arrhenius equation. The attributes are:
Attribute
Description
A
The preexponential factor
T0
The reference temperature
n
The temperature exponent
Ea
The activation energy
Tmin
The minimum temperature at which the model is valid, or zero if unknown or undefined
Tmax
The maximum temperature at which the model is valid, or zero if unknown or undefined
Pmin
The minimum pressure at which the model is valid, or zero if unknown or undefined
Pmax
The maximum pressure at which the model is valid, or zero if unknown or undefined
comment
Information about the model (e.g. its source)
The Arrhenius equation, given below, accurately reproduces the kinetics of many reaction families:
\[k(T) = A \left( \frac{T}{T_0} \right)^n \exp \left( -\frac{E_\mathrm{a}}{RT} \right)\]Above, \(A\) is the preexponential factor, \(T_0\) is the reference temperature, \(n\) is the temperature exponent, and \(E_\mathrm{a}\) is the activation energy.
- A¶
The preexponential factor.
- Ea¶
The activation energy.
- Pmax¶
The maximum pressure at which the model is valid, or
None
if not defined.
- Pmin¶
The minimum pressure at which the model is valid, or
None
if not defined.
- T0¶
The reference temperature.
- Tmax¶
The maximum temperature at which the model is valid, or
None
if not defined.
- Tmin¶
The minimum temperature at which the model is valid, or
None
if not defined.
- change_rate(self, double factor)¶
Changes A factor in Arrhenius expression by multiplying it by a
factor
.
- change_t0(self, double T0)¶
Changes the reference temperature used in the exponent to T0 in K, and adjusts the preexponential factor accordingly.
- comment¶
unicode
- Type:
comment
- discrepancy(self, KineticsModel other_kinetics) double ¶
Returns some measure of the discrepancy based on two different reaction models.
- fit_to_data(self, ndarray Tlist, ndarray klist, unicode kunits, double T0=1, ndarray weights=None, bool three_params=True)¶
Fit the Arrhenius parameters to a set of rate coefficient data klist in units of kunits corresponding to a set of temperatures Tlist in K. A linear least-squares fit is used, which guarantees that the resulting parameters provide the best possible approximation to the data.
- get_rate_coefficient(self, double T, double P=0.0) double ¶
Return the rate coefficient in the appropriate combination of m^3, mol, and s at temperature T in K.
- is_identical_to(self, KineticsModel other_kinetics) bool ¶
Returns
True
if kinetics matches that of another kinetics model. Must match temperature and pressure range of kinetics model, as well as parameters: A, n, Ea, T0. (Shouldn’t have pressure range if it’s Arrhenius.) Otherwise returnsFalse
.
- is_pressure_dependent(self) bool ¶
Return
False
since, by default, all objects derived from KineticsModel represent pressure-independent kinetics.
- is_similar_to(self, KineticsModel other_kinetics) bool ¶
Returns
True
if rates of reaction at temperatures 500,1000,1500,2000 K and 1 and 10 bar are within +/ .5 for log(k), in other words, within a factor of 3.
- is_temperature_valid(self, double T) bool ¶
Return
True
if the temperature T in K is within the valid temperature range of the kinetic data, orFalse
if not. If the minimum and maximum temperature are not defined,True
is returned.
- n¶
The temperature exponent.
- set_cantera_kinetics(self, ct_reaction, species_list)¶
Passes in a cantera ElementaryReaction() object and sets its rate to a Cantera Arrhenius() object.
- to_arrhenius_ep(self, double alpha=0.0, double dHrxn=0.0) ArrheniusEP ¶
Converts an Arrhenius object to ArrheniusEP
If setting alpha, you need to also input dHrxn, which must be given in J/mol (and vise versa).
- to_cantera_kinetics(self)¶
Converts the Arrhenius object to a cantera Arrhenius object
Arrhenius(A,b,E) where A is in units of m^3/kmol/s, b is dimensionless, and E is in J/kmol
- to_html(self)¶
Return an HTML rendering.
- uncertainty¶
rmgpy.kinetics.uncertainties.RateUncertainty
- Type:
uncertainty