Conclusions
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1.
On the basis of plant experiments and the solution of inverse problems of thermal conductivity we obtained heat-transfer coefficients during cooling of large shells in water and air.
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2.
The values obtained for the heat-transfer coefficient during cooling in air differ for the outer and inner surfaces of the shell: For the inner surface they are close to the literature data, while for the outer surface they are almost twice as high.
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3.
The values found for the heat-exchange coefficient during cooling in water to a temperature Tsur≥150–100° are close to the value given in [4]; at lower surface temperatures the values are close to those calculated by the convective heat-exchange formulas [7].
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4.
The calculations made with the M220 computer for quenching shells 3800 mm in diameter and 2500 mm high indicate good agreement between the heat-exchange coefficient and thermophysical properties of the metal (λ and c) and the experimental data both for deep layers and points near the surface.
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Literature cited
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Additional information
NPO TsKTI. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp. 9–12, September, 1979.
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Ivashchenko, M.M., Ulizko, É.P. Determining the heat-transfer coefficients during cooling of large pieces. Met Sci Heat Treat 21, 664–668 (1979). https://doi.org/10.1007/BF00708623
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DOI: https://doi.org/10.1007/BF00708623