Optimization of Fuel Cell Stack Consistency Based on Multi-Model

Table 7

Symbols and meanings.

Symbol	Meaning	Symbol	Meaning
ρ	Density/(kg·m^−3)	i0	Exchange current density/(A·m^2)
ψ	Solving variables	C	Volume molar concentration/(mol·dm^−2)
t	Time/s	Cref	Reference molar concentration/(mol·dm^−2)
	Velocity vector/(m·s^−1)	α	Conversion rate of the electrochemical reactions
Γ	Generalized diffusion coefficient/(m^2·s^−1)	U	Activation potential/V
κ	Thermal conductivity/(W·m^−1 K^−1)	T	Temperature/K
σ	Proton conduction rate/(S·m^−1)	Di	Coefficient of diffusion
k	Electron conductivity/(S·m^−1)	nd	Proton number/electron number
μ	Viscosity coefficient/(kg·m^−1·s^−1)		The initial diffusion coefficient of the components
KGDL	The permeability of the GDL/(m^2·s)		The initial diffusion coefficient of the components
KCL	Permeation of the catalytic layer (CL)/(m^2·s)		Saturation index
Mi	Chemical expression		Pressure factor
Si	Stoichiometric coefficients of each component		Temperature exponent
n	The number of electrons		The density of water (kg·m^−3)
F	Faraday constant/96 485°C/mol		Condensation rate of water
a	Active reaction area/m^2		Phase saturation of water