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Influence of nonequilibrium physicochemical processes in the boundary layer on the ablation of quartz glass

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Abstract

Detailed analysis of the results of experiments on the ablation of quartz glass made by Adams et al. [1] showed (Zalogin [2]) that their study contains contradictions which cannot be eliminated in the framework of their assumptions. The good agreement between the experimental results and a theory of the ablation of quartz glass [3] is fortuitous and due both to an incorrect interpretation of the experiments as well as the assumption made in the theory that the physicochemical processes near an ablating surface take place in equilibrium. These conclusions are confirmed by exact numerical solution of the associated problem of heat and mass transfer on the surface of ablating quartz glass in a high-enthalpy flow of dissociated air [4]. It is shown that the results of such ablation experiments can be used to determine the catalytic activity of the surface of glassy materials in relation to the recombination of atoms at the ablation temperature.

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Literature cited

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    M. Adams, W. E. Powers, and S. Georgiev, “An experimental and theoretical study of quartz ablation at the stagnation point,” J. Aerosp. Sci.,27, 535 (1960).

  2. 2.

    G. N. Zalogin, “Influence of nonequilibrium physicochemical processes in the boundary layer on the ablation of quartz glass,” in: Eleventh Gagarin Lectures. Abstracts of Papers, 1981 [in Russian], Nauka, Moscow (1983), pp. 149–150.

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    Bethe and M. C. Adams, “Theory of ablation of glassy materials,” Vopr. Raket. Tekh., [Russian translations], No. 2, 63 (1960).

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    V. L. Bespalov and G. N. Zalogin, “Ablation of quartz glass in a high-enthalpy flow of dissociated air,” in: Eleventh Gagarin Lectures. Abstracts of Papers, 1981 [in Russian], Nauka, Moscow (1983), p. 149.

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    Yu. V. Polezhaev and F. B. Yurevich, Heat Shielding [in Russian], Énergiya, Moscow (1976), p. 391.

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    V. G. Voronkin and G. N. Zalogin, “On the mechanism of recombination of atomic nitrogen near a catalytic surface in a stream of dissociated air,” Izv. Akad. Nauk SSSR, Mekh. Zhidk, Gaza, No. 3, 156 (1980).

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    L. A. Anderson, “Effect of surface catalytic activity on stagnation heat-transfer rates,” AIAA J.,11, 649 (1973).

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    V. G. Voronkin, “Nonequilibrium viscous flow of a multicomponent gas in the neighborhood of the stagnation point of a blunt body,” Izv. Akad. Nauk SSSR, Mekh, Zhidk, Gaza, No. 2, 144 (1971).

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    R. Goulard, “Catalytic recombination rates in hypersonic stagnation heat transfer,” Jet Propul.,28, 737 (1958).

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Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 4, pp. 125–131, July–August, 1983.

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Bespalov, V.L., Zalogin, G.N. Influence of nonequilibrium physicochemical processes in the boundary layer on the ablation of quartz glass. Fluid Dyn 18, 601–607 (1983). https://doi.org/10.1007/BF01090628

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Keywords

  • Quartz
  • Boundary Layer
  • Mass Transfer
  • Recombination
  • Catalytic Activity