Abstract
The study of unsteady heat transfer of a package consisting of the equal-size balls was performed at boundary conditions of the first kind. The package was located on a horizontal surface and was limited by the walls of a cylindrical thermostat 129 mm in diameter. The experiments were carried out using glass balls with a diameter of 8.85 mm, 16.0 mm, as well as polyoxymethylene balls with a diameter of 9.0 mm. The package was filled with water. The height of the water layer was equal to the diameter of the balls. In the experiments, the time was determined during which the ball package was heated or cooled to the temperature of the thermostat. It is shown that the time of temperature equalization between the package and the thermostat depends not only on the material and size of the balls but also on the direction of the heat flux. It is shown that the heating time of one layer of equal-size balls is much shorter than the cooling time.
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