Accession Number : ADA259344


Title :   An Axisymmetric, Turbulent Flow Analysis of Contaminant Infiltration into a Pressurized Structure with a Fabric Endcap


Descriptive Note : Final rept. Jan-Dec 1990


Corporate Author : LOWELL UNIV RESEARCH FOUNDATION MA


Personal Author(s) : Robertson, Struan


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a259344.pdf


Report Date : Nov 1992


Pagination or Media Count : 162


Abstract : The problem of contaminant transport by turbulent flow and its infiltration into a fabric structure pressurized with uncontaminated air is studied for axisymmetric flow. A modal for turbulent pipe flow having a concentric, pressurized chamber, with a fabric endcap, placed axially within the pipe is developed. Contaminated air enters the pipe and is transported down the pipe. Some of the contaminated air is transported through the fabric and is dispersed within the pressurized chamber. The effect of forcing uncontaminated air into the chamber on the infiltration and dispersion of contaminated air is studied. The particular formulation that is used in this study is the two- equation model of turbulence. The SIMPLER algorithm and code that were used in earlier laminar flow studies have been modified to Incorporate the two-equation model. The fabric is considered to be passive. Comparisons with experimental results show that not all fabrics can be considered as passive because their properties change with the level of contamination.


Descriptors :   *TURBULENT FLOW , *INFILTRATION(FLUIDS) , *CONTAMINANTS , *AXISYMMETRIC FLOW , *FABRICS , COMPUTER PROGRAMS , ALGORITHMS , MODELS , COMPUTERS , TRANSPORT , PIPE FLOW , DISPERSIONS , CHAMBERS , LAMINAR FLOW , NAVIER STOKES EQUATIONS , CONTAMINATION , EQUATIONS , BAROMETRIC PRESSURE , FLOW , AXISYMMETRIC , AIR , PIPES , COMPARISON , FORMULATIONS , STRUCTURES , TURBULENCE


Subject Categories : Textiles
      Computer Programming and Software
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE