A THEORETICAL AND EXPERIMENTAL STUDY OF GAS FLOW THROUGH CLOTH OVER A RANGE OF PRESSURES AND TEMPERATURES
UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES ENGINEER WATERWAYS EXPERIMENT STATION
Pagination or Media Count:
Measurements were made of the permeability of five fabrics at downstream pressures from sea level to 150,000 ft, pressure drops across the samples of 1 mm Hg to 900 mm Hg, and stagnation temperatures from 300 to 930 K. In addition to this basic information, the investigation sought to provide a means of predicting high altitude results from those at sea level. It was found that a the geometry of the test apparatus can have a marked influence on the results, b the major elastic effects on permeability arise from the change in fabric pore inclination with load rather than through simple extension of the yarn itself, c viscous effects are present for all except the very highest pressures, d rarefaction effects appear at altitudes above about 60,000 ft, e the most satisfactory model for explaining the results appears to be one likening the flow to that between two noninteracting cylinders, and f as long as the fabric retains its elasticity and does not take a permanent set, temperature changes affect the permeability only insofar as the air density is changed.
- Fluidics and Fluerics