Modified Pressure-Decay Technique For Evaluating The Permeability Of Highly Dense Refractories

The experimental evaluation of permeability parameters encounters different difficulties, depending on the features of the materials. Traditional steady-state techniques for refractory castables and other highly dense ceramics demand arduous work and require reliable measurements at high pressure and for extremely low flow rates. In this paper, a recent and promising technique known as vacuum-decay permeametry is modified to consider the effect of gas compressibility and fluid inertia. Darcy's law is replaced by Forscheimer's equation, which has been proved to better represent the interactions between fluid and a castable porous medium.