Model Pore Network & Ion Transport

Develop a `PoreNetworkSimulator` class that takes idealized pore network parameters (e.g., porosity, average pore diameter, a tortuosity factor) and electrolyte properties (e.g., ionic conductivity, viscosity). Implement a simplified model (e.g., based on Bruggeman's correlation or a similar effective medium theory) to calculate the effective ion diffusion coefficient and estimate a proxy for charging time. Document the assumptions and limitations of your simulation model.