### Abstract

A two phase model has been developed to study aluminum (Al) particle preheating through selective radiation absorption in composite solid propellants. The two phases considered are one strongly absorbing particle (Al) phase and another weakly absorbing matrix (Ammonium Perchlorate (AP) and binder) phase surrounding the particle phase. Separate energy balance equations for the particle and matrix phases are developed. Both the matrix and the particle phase are assumed to be non-emitting, anisotropically scattering, absorbing media. The parameters identified which strongly influence Al pre-heating and melting are Al size, mass fraction, burn rate and level of incident radiant flux. It was found that large Al mass fractions promote lower Al temperatures. It was also found that for a given Al mass fraction an optimal particle diameter exists which minimizes the Al temperature at the propellant surface.

Original language | English (US) |
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Pages (from-to) | 213-220 |

Number of pages | 8 |

Journal | American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD |

Volume | 45 |

State | Published - Jan 1 1985 |

Externally published | Yes |

### ASJC Scopus subject areas

- Mechanical Engineering
- Fluid Flow and Transfer Processes