The Vapor Class#
The Vapor class links the Environment class with the Particle class by defining condensing vapor that are precursors to particles. The Vapor class is defined in particula/vapor.py. It inherits everything from the Environment class, including attributes and methods. It can be imported as,
from particula.vapor import Vapor
and then it can be initiated with (some of) the Environment attributes as well as the following additional attributes:
Vapor attributes#
attribute |
unit |
default |
|---|---|---|
|
m |
|
|
kg / m^3 |
|
|
kg / m^3 |
|
|
|
|
|
kg / mol |
|
For example, Vapor(vapor_radius=1e-9) initiates the class with vapor radius of 1 nm with all other default attributes. Additionally, Vapor(vapor_radius=1e-9, temperature=290) will initiate the class with 290 K and 1 nm, in addition to all other attributes. Above, vapor_radius and vapor_density refer to the radius of the condensing vapor and its density, respectively. The vapor_concentration attribute defines the driving force of condensation (defined below). The vapor_attachment coefficient is the sticking coefficient between a vapor and a particle and it is dimensionless; vapor_molec_wt is the molecular weight of the condensing vapor.
It is possible to provide multiple vapors with multiple properties.
from particula import u
from particula.vapor import Vapor
VapOne = Vapor(temperature=300)
print("temperature is ", VapOne.temperature) # will print 300 K
print("pressure is ", VapOne.pressure) # will print 101325 Pa (kg/m/s^2)
print("vapor radius is ", VapOne.vapor_radius) # will print 1.6 nm
temperature is 300 kelvin
pressure is 101325 kilogram / meter / second ** 2
vapor radius is 1.6e-09 meter
Vapor methods#
We currently only have one method in the Vapor class.
Vapor.driving_force()#
For now, Vapor.driving_force() is equal to Vapor.vapor_concentration. In reality, the relationship is more complicated, but since we likely do not measure the gas concentration directly, we can estimate it as such and correct it later.