Micro-scale thermal response modeling of an Avcoat-like TPS

Saurabh S. Sawant, Pooja Rao, Abhilash Harpale, Huck Beng Chew, Deborah Levin Fliflet

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The present work describes the efforts to model a complex microstructure of an Avcoat-like material using direct simulation Monte Carlo (DSMC) method with correct boundary conditions, where a cross flow of boundary layer and pyrolysis species through the material can be simulated. To aid in choosing the gas pressures at the boundary, the development and verification of a continuum scale, finite volume solver is presented that models the gas phase in conjunction with the solid phase. To understand the thermal response of the microstructure, a hybrid random walk model is described, which has a capability to include convection, conduction, and radiation. With the help of these tools, the relative importance of heat transfer mechanisms is analyzed on a micron scale morphology. Using DSMC, the continuum permeability of 15.7×10−12 m2 is obtained for our microstructure model with 0.71 porosity. Furthermore, the flow through the microstructure during the process of pyrolysis is analyzed and the detailed collision statistics are reported as a function of depth. An estimate of collision statistics along an assumed trajectory is given to show the relative importance of gas-gas and gas-surface collisions. In addition, a way to scale the DSMC results on a small scale sample to larger depths is described. Finally, molecular dynamics (MD) simulations based on reactive-force-field (ReaxFF) potential are performed to elucidate the pyrolysis kinetics of a highly crosslinked phenolic formaldehyde resin.

Original languageEnglish (US)
Title of host publicationAIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Edition210059
ISBN (Print)9781624105241
DOIs
StatePublished - Jan 1 2018
EventAIAA Aerospace Sciences Meeting, 2018 - Kissimmee, United States
Duration: Jan 8 2018Jan 12 2018

Publication series

NameAIAA Aerospace Sciences Meeting, 2018
Number210059

Other

OtherAIAA Aerospace Sciences Meeting, 2018
CountryUnited States
CityKissimmee
Period1/8/181/12/18

Fingerprint

Gases
Microstructure
Pyrolysis
Statistics
Formaldehyde
Molecular dynamics
Boundary layers
Monte Carlo methods
Resins
Porosity
Trajectories
Hot Temperature
Boundary conditions
Heat transfer
Radiation
Kinetics
Computer simulation
Monte Carlo simulation
Convection

ASJC Scopus subject areas

  • Aerospace Engineering

Cite this

Sawant, S. S., Rao, P., Harpale, A., Chew, H. B., & Levin Fliflet, D. (2018). Micro-scale thermal response modeling of an Avcoat-like TPS. In AIAA Aerospace Sciences Meeting (210059 ed.). (AIAA Aerospace Sciences Meeting, 2018; No. 210059). American Institute of Aeronautics and Astronautics Inc, AIAA. https://doi.org/10.2514/6.2018-0495

Micro-scale thermal response modeling of an Avcoat-like TPS. / Sawant, Saurabh S.; Rao, Pooja; Harpale, Abhilash; Chew, Huck Beng; Levin Fliflet, Deborah.

AIAA Aerospace Sciences Meeting. 210059. ed. American Institute of Aeronautics and Astronautics Inc, AIAA, 2018. (AIAA Aerospace Sciences Meeting, 2018; No. 210059).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Sawant, SS, Rao, P, Harpale, A, Chew, HB & Levin Fliflet, D 2018, Micro-scale thermal response modeling of an Avcoat-like TPS. in AIAA Aerospace Sciences Meeting. 210059 edn, AIAA Aerospace Sciences Meeting, 2018, no. 210059, American Institute of Aeronautics and Astronautics Inc, AIAA, AIAA Aerospace Sciences Meeting, 2018, Kissimmee, United States, 1/8/18. https://doi.org/10.2514/6.2018-0495
Sawant SS, Rao P, Harpale A, Chew HB, Levin Fliflet D. Micro-scale thermal response modeling of an Avcoat-like TPS. In AIAA Aerospace Sciences Meeting. 210059 ed. American Institute of Aeronautics and Astronautics Inc, AIAA. 2018. (AIAA Aerospace Sciences Meeting, 2018; 210059). https://doi.org/10.2514/6.2018-0495
Sawant, Saurabh S. ; Rao, Pooja ; Harpale, Abhilash ; Chew, Huck Beng ; Levin Fliflet, Deborah. / Micro-scale thermal response modeling of an Avcoat-like TPS. AIAA Aerospace Sciences Meeting. 210059. ed. American Institute of Aeronautics and Astronautics Inc, AIAA, 2018. (AIAA Aerospace Sciences Meeting, 2018; 210059).
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