A THEORETICAL AND EXPERIMENTAL STUDY OF GAS FLOW THROUGH CLOTH OVER A RANGE OF PRESSURES AND TEMPERATURES
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1961
- Accession Number
- AD0270595
Entities
People
- Frederick O. Smetana
Organizations
- University of Southern California