Heat transfer capabilities of coatings made of mineral media


Аuthors

Genbach А. А.1, Bondartsev D. Y.2*, Piralishvili S. A.2

1. Almaty University of Power Engineering and Telecommunications named after G. Daukeev, Almaty, Kazakhstan
2. Rybinsk State Aviation Technical University named after P.A. Soloviev, RSATU, 53, Pushkin St., Rybinsk, Yaroslavl region, 152934, Russia

*e-mail: d.bondartsev@aues.kz

Abstract

Materials such as quartzites, granites, teschenites, tuffs, and marbles were studied for the development of a cooling system with high heat transfer characteristics. A comparative evaluation demonstrated the advantages of this system over alternative ones. Nonlinear fracture mechanics based on the limit state concept was used to explain the experimental results, while optical methods revealed the physical mechanisms of failure in capillary-porous coatings. The processes of spray coating mineral media using a detonation flame on a metal surface were studied with the help of a custom-designed thermal tool. An integral heat exchange between structures and coatings was achieved under the influence of mass and capillary forces. Unified thermal tools using both kerosene-oxygen and gasoline(kerosene)-air oxidizers were considered, which is essential for the application of elastic and viscous materials in coating regimes involving no melting, partial melting, or full melting. The size effect was investigated, where particle diameter could be smaller or larger than the coating thickness. Inelastic processes in the failure zone were found to occur at the powder grain level. Particle selection for spraying was carried out based on grain size and weight percentage. The research included various combinations of fuel and oxidizer, both in the jet and in the coating. The potential of finding effective thermal barrier coatings was demonstrated. A calculation of the specific heat flux in the critical section of a nozzle is presented. Industrial mesh structures and coatings made of mineral media were investigated in a combined field of capillary and gravitational forces. The thermophysical characteristics of the coatings were determined: for teshenite – (2,2÷4) MW/m²; for granite – (4÷7) MW/m²; and for quartzite – (7÷12) MW/m², with the overheating range of the coatings being (20÷75) K. The thermal protection coating is based on the integration of natural materials and industrial mesh structures. The proposed coatings made of natural mineral media, including multilayer systems – where the outer layer operates at higher temperatures and the optimized mesh structures serve as the inner cooling layer - represent an integrated and multifunctional protective system for heavily loaded components of GTUs. The selection of a natural polycrystalline medium proved efficient for numerical and physical modeling and scaling.

Keywords:

natural materials, coatings, thermal tool, heat transfer crisis, detonation flame

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