Wetting behaviour of AGM materials

Vertical spaces greater than lateral spaces 

Wetting characteristics can be improved by maximizing the surface area through the use of densely packed fibres of small diameter — but at a higher cost and with the likelihood of a decrease in the efficiency of oxygen recombination. The fibre blend and subsequent treatment influence the resulting pore size and associated properties such as tensile strength and compressibility. In addition, some manufacturers use 

Integration of eqn. (6.1) and invoking the limit that h = 0 at time zero gives  

If the gravity term in eqn. (6.1) is ignored, integration yields the expression  

The driving force for liquid penetration is governed by the pressure gradient, P, across the curved liquid]gas interface. The pressure drop across the interface in a uniform capillary of radius r is given by  

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