Diffusion of gases in porous solids - simulation and measurements. Ninth quarterly report, July 16-October 15, 1984

Technical Report · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6356553

Evans, J W

The progress report for the last (eighth) quarter contained an error analysis of experimental results previously obtained in the experimental phase of this project. It was concluded that the errors were excessive and efforts this quarter have been directed at rectifying this problem. The major source of error was the viscous flow contribution to mass transport through the porous plug wherein diffusivities are measured. Pressure differentials across the plug are maintained at their lowest possible value during diffusion experiments in order that transport of gases through the porous plug be by diffusion rather than by viscous flow. For a given pressure differential, viscous flow of the gas through the plug is proportional to the fourth power of the pore size while the diffusive transport is unaffected by pore size in the ordinary diffusion regime. Prior experimental work had been carried out using a porous plug with a mean pore size of 29..mu..m; this plug has been replaced with one of a 5..mu..m mean pore size. Experimental data obtained this quarter on the diffusivity of methane and nitrogen are presented. Theoretical work concerned with Monte Carlo simulation of the diffusion of gases in porous solids has yielded interesting results. These are discussed briefly. 2 figures.

• Research Organization: California Univ., Berkeley (USA). Dept. of Materials Science and Mineral Engineering
• DOE Contract Number: FG22-82PC50796
• OSTI ID: 6356553
• Report Number(s): DOE/PC/50796-T7; ON: DE85002860
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
ALKANES
DATA
DIFFUSION
ELEMENTS
ERRORS
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROCARBONS
INFORMATION
LOW TEMPERATURE
MATERIALS
MEDIUM TEMPERATURE
METHANE
MONTE CARLO METHOD
NITROGEN
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PERMEABILITY
POROUS MATERIALS
SIMULATION
TEMPERATURE DEPENDENCE