Browsing by Author "Georgiev G.E."

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    INVESTIGATION OF THE POSSIBILITY OF DETERMINING THE THERMAL CONDUCTIVITY COEFFICIENT OF A356 FOAM BY MATHEMATICAL MODELING AND IDENTIFICATION PROCEDURE
    (2022-01-01) Georgiev G.E.; Velikov A.; Krastev B.; Popov S.; Stanev S.; Yordanova R.; Manolov V.
    A method for determining the thermal conductivity coefficient of a foam material of A356 aluminum alloy has been proposed. The foam material has been produced by decomposition of titanium hydride introduced into the melt and subsequent cooling and crystallization. During the process, the measurement of temperature dependences on time has been performed at two selected points of the foam casting. The problem of heat transfer and crystallization of the casting and mold is solved by means of mathematical model proposed. The experimental data and the corresponding solutions of the mathematical model have been used for the realization of an identification procedure for determining the coefficient of thermal conductivity of the foam material and the coefficient of heat transfer at the casting-mold boundary. Through the represented methodology new data for important thermophysical characteristic are obtained.