permcoef {transmem} | R Documentation |
Calculates permeability coefficients
Description
Permeability coefficients across a membrane as derived from integrated Fick's law can be obtained from transport data according to the equation
\ln{\Bigg(\frac{C}{C^0}\Bigg)}=
-\frac{P~a}{V}t
where P
is the permeability coefficient, a
is
the membrane exposed area, C
and C^0
are
the species concentrations at any time and at initial time in the feed phase,
respectively, and V
is solution volume.
Usage
permcoef(trans, vol, area, units = c("cm^3", "cm^2", "h"), conc0 = NULL,
plot = FALSE)
Arguments
trans |
Data frame with the complete transport information of
interest species. Must be generated using
|
vol |
Volume of the feed solution. |
area |
Membrane exposed area to the feed solution. |
units |
Units in which volume, area and time are provided. Volume
and area are function's parameters while the time is
extracted from the |
conc0 |
Initial concentration of the species in the feed solution. The
value may be extracted from transport information if the data
frame provided in |
plot |
logical default to |
Details
Species concentration units may be arbitrary as long as the permeability coefficient is calculated using the change in concentration ratio which is, as most ratios, adimensional
Value
A numeric vector with the permeability coefficient and it's standard uncertainty from the regression. Units are meters per second.
Author(s)
Cristhian Paredes, craparedesca@unal.edu.co
Eduardo Rodriguez de San Miguel, erdsmg@unam.mx