Estimation of the thermal diffusivity in a large electroceramic body by an invere method

Loading...
Thumbnail Image

Date

Authors

Húlan, T
Ondruška, J
Kováč, J
Medved’, I
Trník, A
Vozár, L

Journal Title

Journal ISSN

Volume Title

Publisher

International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics

Abstract

Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.
We investigate the temperature dependence of the thermal diffusivity for a large ceramic body of a cylindrical shape during firing up to 900 °C. The body was made of a ceramic material used in the production of electroporcelain insulators. We describe the corresponding heat transfer by the standard heat equation and solve the inverse problem by the Levenberg-Marquardt method. The results show that the method allows one to detect the physical-chemical processes occurring in the material during firing, namely, the liberation of physically bound water in the range up to 250 °C, the phase transformation of kaolinite into metakaolinite (dehydroxyla-tion) in the range ~ 450 °C – 650 °C, and solid-state sintering starting at ~ 700 °C.

Description

Keywords

Thermal diffusivity, electroceramic body, electroporcelain insulators

Sustainable Development Goals

Citation

Húlan, T, Ondruška, J, Kováč, J, Medved’, I, Trník, A, Vozár, L 2014, 'Estimation of the thermal diffusivity in a large electroceramic body by an invere method', Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.