.FuelCellLib.Layer1D.act_layer

Information

act_Layer-Layer1D

This class represents the method of finite volumes to solve the one dimensional problem of the layer. Also in this class all parameter of transport phenomena and control volume of catalyst layer are defined. One of these parameters, "n" is the number of finite volumes of the layer. The simulation can become too slowed if the parameter "n" is very high. The selection of the variable modeling hypothesis is defined by the parameters:
"ModHyp1": Psuedocapacitance dependence(0:Off,1:On)
"ModHyp2":Knudsen diffusion pore size dependence(0:Off,1:On)
"ModHyp3":Electro-Osmotic drag effect(0:Off,1:On)
"ModHyp4":Electrolyte conductivity dependence(0:Off,1:On)

Parameters

Name	Default	Description
T	340	Operation temperature of active layer [K]
av	1e-9	Specific condensation surface [m2/m3]
b	0.001	Material transfer coeficient [m/s]
Es	0.7	Volumetric fraction of solid
Ee	0.2	Volumetric fraction of electrolyte
cdl	1	Electrical capacity of double layer [F]
da	1e-6	Thickness of transport phenomena [m]
tau	5	Tortuosity
Dwl	3.5e-9	Surface diffusion coefficient of H2O, liquid phase [m2/s]
ks	1e4	Electrical conducivity of the solid [S/m]
kpo	10e-2	Constant protonic conducivity of the electrolyte [S/m]
posat	3169	Reference Saturation pressure [Pa]
Tosat	298.16	Reference Saturation temperature [K]
rom	2000	Density of the electrolyte [kg/m3]
ros	4000	Density of the solid [kg/m3]
Mm	1.1	Molar mass of the electrolyte [kg/mol]
roh2ol	972	Density of water [kg/m3]
Aioref	1.28	Catalyst area and reference exchange current density [A/m3]
poa	100000	Reference pressure for the current limit [Pa]
B	0.060	Tafel slope [V]
jlim	2.40e3	Limit current [A]
D1co	0.007853e-4	Constant Knudsen diffusion coefficient for oxygen [m2/s]
D2co	0.01047e-4	Constant Knudsen diffusion coefficient for steam water [m2/s]
rp	1e-10	Pore size of porous media [m]
D12o	0.282e-4	Constant binary diffusion coefficient [m2/s]
pAref	100000	Reference pressure to measure the binary diffusion coefficient [Pa]
Tref	308.1	Reference temperature to measure the binary diffusion coefficient [K]
ModHyp1	0	Psuedocapacitance dependence(0:Off,1:On)
ModHyp2	0	Knudsen diffusion pore size dependence(0:Off,1:On)
ModHyp3	0	Electro-Osmotic drag effect(0:Off,1:On)
ModHyp4	1	Electrolyte conductivity dependence(0:Off,1:On)
n	10	Number of finite elements for active layer

References

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