The permeability of ablative materials under rarefied gas conditions

Craig White, Thomas Scanlon, Richard Brown

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Numerical meshes of both cork and carbon fibre ablative materials in their virgin and pyrolised states, with realistic porosity and tortuosity, have been created from micro-computed tomography (μCT) scans. The porosity of each material has been calculated from the μCT scans and used to extract smaller representative sample volumes to perform numerical simulations on. Direct simulation Monte Carlo simulations of rarefied gas flow through these materials have been performed to find the permeability of each material to argon gas and to a gas mixture. The method has been validated by comparing the measured permeability for a Berea sandstone material to previously published experimental values. For the specific pressure conditions investigated here, the cork-phenolic material becomes around ten mores permeable after being pyrolised, while the carbon-phenolic material only becomes five times more permeable than its virgin form. The permeability to the gas mixture is found to be greater than to argon for most of the samples, showing the importance of choosing the correct gas for rarefied permeability studies. The form of the pressure and Mach number profiles through the materials is indepedent of the applied pressure gradient.
LanguageEnglish
Pages134-142
Number of pages9
JournalJournal of Spacecraft and Rockets
Volume53
Issue number1
DOIs
Publication statusPublished - 24 Dec 2015

Fingerprint

ablative materials
Ablative materials
rarefied gases
permeability
Gases
gas
gas mixtures
argon
porosity
Argon
simulation
Gas mixtures
sandstones
carbon fibers
pressure gradients
gases
Mach number
gas flow
Porosity
mesh

Keywords

  • rarefied gas dynamics
  • porosity
  • tortuosity
  • pressure

Cite this

White, Craig ; Scanlon, Thomas ; Brown, Richard. / The permeability of ablative materials under rarefied gas conditions. In: Journal of Spacecraft and Rockets. 2015 ; Vol. 53, No. 1. pp. 134-142.
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The permeability of ablative materials under rarefied gas conditions. / White, Craig; Scanlon, Thomas; Brown, Richard.

In: Journal of Spacecraft and Rockets, Vol. 53, No. 1, 24.12.2015, p. 134-142.

Research output: Contribution to journalArticle

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AB - Numerical meshes of both cork and carbon fibre ablative materials in their virgin and pyrolised states, with realistic porosity and tortuosity, have been created from micro-computed tomography (μCT) scans. The porosity of each material has been calculated from the μCT scans and used to extract smaller representative sample volumes to perform numerical simulations on. Direct simulation Monte Carlo simulations of rarefied gas flow through these materials have been performed to find the permeability of each material to argon gas and to a gas mixture. The method has been validated by comparing the measured permeability for a Berea sandstone material to previously published experimental values. For the specific pressure conditions investigated here, the cork-phenolic material becomes around ten mores permeable after being pyrolised, while the carbon-phenolic material only becomes five times more permeable than its virgin form. The permeability to the gas mixture is found to be greater than to argon for most of the samples, showing the importance of choosing the correct gas for rarefied permeability studies. The form of the pressure and Mach number profiles through the materials is indepedent of the applied pressure gradient.

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