Prediction of gas transport properties through fibrous carbon preform microstructures using Direct Simulation Monte Carlo

Revathi Jambunathan, Deborah A. Levin, Arnaud Borner, Joseph C. Ferguson, Francesco Panerai

Research output: Contribution to journalArticle

Abstract

We use the Cuda-based Hybrid Approach for Octree Simulations (CHAOS) DSMC solver to predict gas transport coefficients of Morgan felt and FiberForm TPS materials with sample size of (1×1×1) mm3. The detailed velocity flow-field of the pressure-driven flow through these materials is studied to compare the effect of material microstructures on gas transport. It is found that the effective flow path traversed by the gas is more circuitous and longer for FiberForm compared to the more porous felt. The obstruction offered by the material and the circuitous flow path is quantified by the Klinkenberg-derived permeability and hydraulic tortuosity factor, which are key material properties that govern the momentum transport through porous media. We also compute the hydraulic pore diameter of these materials and find that the through-thickness and in-plane pore diameter is equal to 86.94 and 98.7 μm for felt and 36.25 and 60.9 μm for Fiberform, which is within 5–6% of the average pore-size obtained from the tomography images.

Original languageEnglish (US)
Pages (from-to)923-937
Number of pages15
JournalInternational Journal of Heat and Mass Transfer
Volume130
DOIs
StatePublished - Mar 2019

Keywords

  • DSMC
  • Hydraulic tortuosity
  • Klinkenberg permeability
  • Porous fibrous microstructures
  • Transport properties

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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