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Effect of Aero-Therm insulation layer on the overall heat transfer coefficient
 Kordík, Jozef
The aim of this work was to test the properties of Aero-Therm insulation layer by determining overall heat transfer coefficients for selected cases of flow past a sphere. The material of the sphere was copper to minimize uncertainties due to internal temperature gradients. Three variants were examined, which differed in sphere surface thermal insulation. In the first variant, the sphere with a diameter of 40 mm had no insulation; only a thin layer of a copper oxide was present on the surface only. In the second variant, the sphere was coated with Aero-Therm insulating layer with a thickness of about 1.5 mm. The third variant differed from the second one in the thickness of the insulating layer, which was 2.9 mm in this case. The overall heat transfer coefficients were determined for cooling the sphere by a forced convection by air at various flow velocities.
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