A maximum entropy production model for Teflon ablation by arc radiation

In the framework of the maximum entropy production rate principle, a simple model for Teflon material ablation by arc radiation is introduced. The model predicts a vapour temperature T and an effective ablation enthalpy Δ h eff of about 3200 K and 11 MJ kg −1 , respectively. These values are constant for radiation fluxes Q rad ≪ p Δ h eff / c (≈10 10 W m −2 at pressure p ≈ 10 bar and sound velocity c ≈ 10 3 m s −1 ). For larger Q rad the model is not self-consistent and must be generalized. In the range of self-consistency, the results are in accordance with observations reported in the relevant literature on nozzle ablation in gas circuit breakers or model tubes.