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Proceedings Paper

Diffusion of water into purged volumes
Author(s): Lubos Brieda; John Newcome; Therese Errigo
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Paper Abstract

In this paper, we report on an experimental and numerical effort to characterize removal and infiltration of atmospheric water vapor into a cavity purged with dry GN2. Multiple miniature sensors were used to track humidity and pressure inside a cylindrical enclosure with internal obstruction and a secondary volume. These measurements were compared against the well-known model of Scialdone. Although our data indicate a similar exponential-like decay, the t parameters differed from the predicted values. In addition, a numerical model was developed to study the purge and infiltration problem in more detail. The model utilizes an Advection-Diffusion solver for the contaminant species, and an incompressible Navier-Stokes solver for the flow velocity. Comparison of preliminary numerical results with the experimental data is presented.

Paper Details

Date Published: 18 September 2014
PDF: 19 pages
Proc. SPIE 9196, Systems Contamination: Prediction, Measurement, and Control 2014, 919606 (18 September 2014); doi: 10.1117/12.2061939
Show Author Affiliations
Lubos Brieda, Particle In Cell Consulting LLC (United States)
John Newcome, ASRC Federal (United States)
Therese Errigo, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 9196:
Systems Contamination: Prediction, Measurement, and Control 2014
Nancy Carosso; Joanne Egges, Editor(s)

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