Simultaneous measurement of six thermal properties of a charring plastic

Pfahl, Robert C.; Mitchel, B. J.

doi:10.1016/0017-9310(70)90107-9

Cited by 12 publications

(1 citation statement)

References 5 publications

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“…When an elastomeric ablative material is exposed to a high heat flux, it begins to decompose until it reaches the pyrolysis temperature, and subsequently, char layer ablation occurs at higher temperature. 18 The elastomeric ablative material serves an important protective role in aerospace technology by a self-regulating heat and mass transfer process known as ablation. 19 Thermal design ability of ablative materials depends on the full understanding of the fundamental processes and developing the appropriate mathematical models.…”

Section: Introductionmentioning

confidence: 99%

Ablation behavior of organoclay‐NBR insulator: Modeling and experimental

2018

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Summary Nitrile‐based nanocomposite heat insulators are very attractive materials compared with their similar nonelastomeric counterparts, due to their higher deformation bearing capacity in special applications. Modeling of these ablative nanocomposites enables us to determine the exact required thickness of the insulator and temperature distribution across it at predetermined thermal conditions. The complete form of the ablation equation is a transient nonlinear second‐order differential equation with variable temperature‐dependent thermo‐physical properties, which must be determined during thermal degradation. In this work, in addition to experimental investigation of ablative elastomeric nanocomposites based on NBR, the ablation process is modeled analytically with perturbation theory in the Lagrangian coordinate system because of surface recession and moving boundaries. Kirchhoff transformation was used to get rid of the temperature dependence of k in each zonal of virgin and char. The theoretical results were confirmed by experimental data obtained from the oxyacetylene flame test. The results proposed a competitive nitrile‐based nanocomposite heat insulator with superior ablation properties: mass ablation rate 0.014 g s−1, linear ablation rate 0.012 mm s−1, and insulating index number 6800 s m−1, under a standard test with a heat flux of 2500 kW m−2 for 15 seconds.

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Section: Introductionmentioning

confidence: 99%