In Plane, Gas and Liquid Permeability Microflow Test

In-Plane Liquid Permeability

Definition: The ability of a material to allow liquids to flow through it along its surface.

Measurement: Can be measured using methods like PMI in-plane permeability test apparatus, which uses radial flow, or by measuring pressure drop across a material with known flow rates.

Importance: Important in applications like wicking in thin films and pressure-driven flow in porous materials.

Example: In the context of fuel cells, in-plane liquid permeability is relevant to the movement of water or other liquids within the GDLs.

In-Plane Microflow Test:

Definition: A technique used to measure the flow of fluids (liquids or gases) within the micro channels of a material.

Application: Useful for characterizing the permeability of porous thin films and materials with microstructures, where traditional permeability tests may not be suitable.

Example: A method using a manifold pressed to the top surface of a thin film has been developed to measure in-plane permeability of porous thin films.

In-Plane Gas Permeability:

Definition: The ability of a material to allow gases to flow through it along its surface.

Measurement: Can be measured using methods like differential pressure measurements, where the pressure drop across a material is measured as gas flows through it at a known flow rate.

Importance: Crucial in fuel cells and other applications where gas transport across the GDLs is important.

Example: In fuel cells, in-plane gas permeability is important for
efficient gas transport from the gas channels to the electrode.