A mixed-percolation model of capillary hysteresis and entrapment in mercury porosimetry

Journal Article · Wed Dec 01 04:00:00 EST 1993 · Journal of Colloid and Interface Science; (United States)

DOI:https://doi.org/10.1006/jcis.1993.1468· OSTI ID:5577325

Ioannidis, M A; Chatzis, I ^[1]

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1. Univ. of Waterloo, Ontario (Canada). Dept. of Chemical Engineering

A wealth of information about the structure of porous materials is contained in the experimental data of mercury intrusion and retraction obtained from mercury porosimetry. Proper interpretation of such data requires the use of a model capable of describing the phenomena of capillary pressure hysteresis and mercury entrapment. This work advances the concept of mixed-percolation on cubic lattices representing pore bodies, connected through pore throats, as a general model for the study of hysteresis and entrapment observed in the course of mercury retraction in porosimetry. The dominant phenomena of local capillary instability (snap-off of mercury threads, piston-type intrusion and retraction), affecting the movement of mercury-air interfaces in pore throats and pore bodies, are accounted for and related to the macroscopic capillary pressure-saturation behavior by means of computer simulation. Local correlations among pore throat and pore body sizes, as well as microscopic heterogeneities due to spatial correlations among the pore bodies are also accounted for in the model. The simulator is used to study the dependence of mercury porosimetry curves on pore throat and pore body size distributions and spatial correlations, as well as on contact angle. It is shown that mercury retraction can be successfully modeled as the deterministic outcome of the competition between two simultaneously occurring percolation processes, snap-off in pore throats (bond-percolation) and piston-type retraction from pore bodies (site-percolation).

• OSTI ID: 5577325
• Journal Information: Journal of Colloid and Interface Science; (United States), Journal Name: Journal of Colloid and Interface Science; (United States) Vol. 161:2; ISSN 0021-9797; ISSN JCISA5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
CAPILLARY FLOW
COMPUTERIZED SIMULATION
DATA ANALYSIS
ELEMENTS
FLUID FLOW
HYSTERESIS
MATERIALS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MERCURY
METALS
MICROSTRUCTURE
MORPHOLOGY
PORE STRUCTURE
POROSIMETERS
POROUS MATERIALS
SIMULATION