Effective Permeability of Carbon Composites Under Reentry Conditions

Savio J. Poovathingal, Brendan M. Soto, Cameron Brewer

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Effective permeability of a porous carbon composite used as thermal protection system on space capsules is computed using the direct simulation Monte Carlo technique. The microstructure of the carbon composite is synthetically generated using an in-house code. Permeabilities obtained using synthetic microstructures of the precursor (carbon fibers) are compared with two independent experimental dataset, and good agreement is observed. It is conclusively shown that the difference in permeability values between the two experimental datasets arose from the variations in the sample density. An approach to digitally infuse resin into the precursor is proposed. Comparison of the permeability for the full composite (carbon fibers with resin) with experimental data resulted in errors within 7.5%, indicating that representative microstructures generated digitally can be used to compute and predict effective permeability of porous carbon composites. Simulations of Ar and air permeating through the full composite are performed, and an intrinsic material permeability (Ko ) of 1.866 × 10−11 m2 and a Klinkenberg constant (b ) of 5.655 × 10−8 that is only dependent on the temperature and the molecular weight of the gaseous species are obtained. It is shown that this new generalized relation could be used for other gases such as CO and CO2 .

Original languageEnglish
Pages (from-to)1293-1302
Number of pages10
JournalAIAA Journal
Volume60
Issue number3
DOIs
StatePublished - 2022

Bibliographical note

Funding Information:
Financial support from NASA Kentucky EPSCoR under NASA grant number 80NSSC19M0052 is acknowledged. Brendan Soto would like to acknowledge support from NASA Kentucky Space Grant Fellowship under grant number 80NSSC20M0047. Cameron Brewer is a fellow with the Chellgren Center for Undergraduate Excellence. Insightful discussions with Alexandre Martin on the Klinkenberg formulation are deeply appreciated. We also thank the University of Kentucky Center for Computational Sciences and Information Technology Services Research Computing for their support and use of the Lipscomb Compute Cluster and associated research computing resources.

Publisher Copyright:
© 2022, AIAA International. All rights reserved.

ASJC Scopus subject areas

  • Aerospace Engineering

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