A Method for Decoupling Solid and Radiative Thermal Conductivity in Fibrous Insulation Materials

Christopher T. Barrow, John F. Maddox, Sergiy Markutsya

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Fibrous insulation materials are used in thermal protection systems (TPS) due to their low thermal conductivity and low density. The study of the underlying conductivity physics is in active research since the conductivity is derived from multiple heat transfer modes. The primary heat transfer modes are solid conduction through fibers, gaseous conduction between fibers, and radiation exchange between the fibers. Under vacuum, the solid and radiation modes are hard to distinguish. To separate these modes, a collection of conductivity measurements under a wide range of temperatures must be conducted. This allows for radiation to be enhanced at high temperatures and minimized at lower temperatures. To ensure the validity of parameters fitted to the measurement data, a study of the fitting technique was performed on benchmark data that models the solid and radiation in other materials. This has historically been done using genetic algorithms due to the non-linear nature of the models, and this method was employed for this study. Simulated measurement data was generated using the benchmark case and techniques were trialed to determine the best approach in properly fitting the data. A technique that performed a non-negative bounding search on the genetic algorithm minimizing the residuals of the fit had the best fitting parameters and can be used in later work on untested materials.

Original languageEnglish
Title of host publicationAIAA AVIATION 2022 Forum
DOIs
StatePublished - 2022
EventAIAA AVIATION 2022 Forum - Chicago, United States
Duration: Jun 27 2022Jul 1 2022

Publication series

NameAIAA AVIATION 2022 Forum

Conference

ConferenceAIAA AVIATION 2022 Forum
Country/TerritoryUnited States
CityChicago
Period6/27/227/1/22

Bibliographical note

Funding Information:
Financial support for this work was provided by by NASA Kentucky under NASA award No: 80NSSC20M0047. Additional support was provided by NASA ACCESS STRI award No: 80NSSC21K1117.

Publisher Copyright:
© 2022, American Institute of Aeronautics and Astronautics Inc, AIAA., All rights reserved.

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Nuclear Energy and Engineering
  • Aerospace Engineering

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