THE DIFFUSION OF SULFUR DIOXIDE IN AIR THROUGH STACKED LAYERS OF PAPER
Michael A. Dimitroff, & James W. Lacksonen
ABSTRACT—Sulfur dioxide (0.5% to 1.0%) in air at 73�F and 57% relative humidity was used to measure the effective diffusivity of sulfur dioxide through paper. A 3.8cm thick block of stacked layers of 100% cotton bond Crane's Kid Finish in Pearl White color was mounted in a diffusion cell. Diffusion studies were made in directions both normal (perpendicular) and parallel to stacked sheets of paper. An average effective diffusivity of 0.0072 cm2/s and a tortuosity of 4.7 were calculated for the diffusion of sulfur dioxide normal to the paper. An average effective diffusivity of 0.036 cm2/s and a tortuosity of 1.0 were calculated for diffusion parallel to the paper.