- Author
-
Quenard, D. A.
|
Bentz, D. P.
- Title
- Capillary Condensation, Hysteresis, and Image Analysis.
- Coporate
- CSTM, St. Martin d'Heres, France
National Bureau of Standards, Gaithersburg, MD
- Book or Conf
- Drying Symposium, 8th International. Drying '92 Proceedings. August 2-5, 1992,
Elsevier Science Publishers B.V.,
Montreal, Canada,
Mujumdar, A. S., Editors,
253-262 p.,
1992
- Keywords
-
digital imaging
|
capillary flow
|
condensation reactions
- Abstract
- Capillary condensation in a random porous medium is modelled using a two-dimensional digital-image-based approach. Starting with a digital image of a real or model material, adsorption sites are determined based on the Kelvin-Laplace equation while desorption sites are based on this equation and a connectivity criterion. Two approaches are presented for detemrining the adsorption and desorption isotherms of an image: one based on mathematical morphology and the other a more direct approach first developed for modelling mercury intrusion. The two techniques are shown to give similar results for the same image. the techniques are applied to determining the sorption isotherms for model materials where the solid phase consists of overlapping and nonoverlapping circles, each at two porosities. The model systems exhibit hysteresis behavior similar to that commonly observed in real materials. Adsorption-desorption behavior is shown to depend critically on the structure of the pore space and not simply on the total porosity.