Accession Number:

ADA250523

Title:

Experimental Investigation of Moisture Vapor Transmission through Tentage Fabrics

Descriptive Note:

Final rept. Oct 1989-Sep 1992

Corporate Author:

ARMY NATICK RESEARCH DEVELOPMENT AND ENGINEERING CENTER MA

Report Date:

1992-04-01

Pagination or Media Count:

39.0

Abstract:

In order to test the validity of a theoretical model of agent transfer through a fabric membrane and to develop a standardized method for testing infiltration through fabrics under steady wind and external conditions, an experimental apparatus and procedure have been developed using water vapor as a tracer. This experimental model is capable of measuring infiltration through a fabric membrane into a test cylinder under a variety of external wind speeds and internal overpressures. Experiments have been conducted on cotton duck, cotton oxford, and polyester duck. The data collected will be used to verify the results of the theoretical model and to compare the infiltration rates of different fabrics under a variety of conditions. A comparison of initial predictions made using the theoretical model with experimental results revealed that there was a slower rate of infiltration into the chamber in the experiments than was predicted by the theoretical model. It is thought that this difference is due to the fact that the computational code models the fabric an a membrane with constant properties, while in the experiment its properties are changing. For example, as the fabric absorbs moisture and the fibers swell, the permeability of the fabric is decreased. TENTAGE, INFILTRATION, WIND TUNNEL MODELS, FABRICS, MODELS, AGENT TRANSFER, MOISTURE VAPOR TRANSMISSION, WATER VAPOR, WIND TUNNEL TESTS.

Subject Categories:

  • Physical Chemistry
  • Textiles

Distribution Statement:

APPROVED FOR PUBLIC RELEASE