An Irreversible Thermodynamics Model for Graphite Sublimation in Intense Radiation Environments.

Abstract

A model for the phase change behavior of graphite when exposed to a high external radiation heat flux has been developed in order to examine solid-gas nonequilibrium effects. The usual Knudsen-Langmuir type model is extended to one which allows both pressure and temperature discontinuities at the ablating surface. Calculated results indicate a relatively constant effective heat of ablation. However, major uncertainties are shown to remain regarding individual carbon species concentrations and the input energy required for melting. A unique feature of the irreversible thermodynamics model is the prediction of gas phase supersaturation when JANNAF thermochemical data is utilized. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Sep 15, 1980
Accession Number
ADA089405

Entities

People

  • R. L. Baker

Organizations

  • The Aerospace Corporation

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Chemical Reactions
  • Chemistry
  • Data Sets
  • Equations
  • Experimental Data
  • Graphitic Materials
  • Heat Energy
  • Heat Flux
  • Materials
  • Models
  • Partial Pressure
  • Radiation
  • Space Systems
  • Supersaturation
  • Thermodynamics
  • Vapor Pressure

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Thermal Physics or Thermal Science.