.FuelCellLib.Basics.tp_mem

Information

tp_mem-Transport Phenomena


This equation shown the flux of liquid water as a dependence on the gradient of water load and electrosmotic drag. In the library , the electrosmotic drag is a opcional modeling hypothesis, selected by the parameter "ModHyp3" in membrane layer (MEM_LAYER) located in LAYER1D package.

This equation shown the flux of steam water in membrane, this depends on gradient of gas pressure.

Protonic flux depends on the gradient of electrolyte voltage multiply by the protonic conductivity and the electrolyte volume.

The maximum water load in membrane is shown next and it depends on the density of water and the membrane and the volume of electrolyte.

Electrosmotic drag coefficient is a empirical equation, this depends on the water load of the membrane and the lectrolyte pore. This coefficient shows the water flux and protonic flux ratio.

The pore volume is the blank space that doesn't fill the electrolyte

The proton conductivity is another variable modeling hypothesis in the library, called "ModHyp4" located in "MEM_LAYER" in the Layers1D package. The user select with "ModHyp4" a constant proton conductivity or a water load dependence equation of proton conductivity.

Parameters

Name Default Description
tau   Tortuosity
Ee   Volumetric fraction of electrolyte
da   Thickness of transport phenomena [m]
T   Operation temperature of active layer [K]
D2   Constant Fick diffusion coefficient for steam water [m2/s]
Dwl   Surface diffusion coefficient of H2O, liquid phase [m2/s]
ks   Electrical conducivity of the solid [S/m]
rom   Density of the electrolyte [kg/m3]
kpo   Constant protonic conducivity of the electrolyte [S/m]
roh2ol   Density of water [kg/m3]
posat   Reference Saturation pressure [Pa]
Tosat   Reference Saturation temperature [K]
Mm   Molar mass of the electrolyte [kg/mol]
ModHyp3   Electro-Osmotic drag effect(0:Off,1:On)
ModHyp4   Electrolyte conductivity dependence(0:Off,1:On)


References


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