THERMAL SCIENCE

International Scientific Journal

Ivana D. Nikolić

,

Nenad D. Milošević

,

Slobodan J. Petričević

TEMPERATURE NON-UNIFORMITY DUE TO HEAT CONDUCTION AND RADIATION IN THE PULSE CALORIMETRY TECHNIQUE

ABSTRACT
The paper presents an assessment of the unwanted temperature non-uniformity found in high temperature applications of the pulse calorimetry technique. Specimens in the form of a solid cylinder undergoes fast electrical heating and an intense heat radiation at high temperatures, coupled with the heat conduction the specimens’ cold ends, make them having a highly non-uniform temperature distribution, both in their radial and axial directions. By using finite element method simulations of a typical pulse calorimetry experiment, the temperature non-uniformity across the specimen diameter and along the specimen effective length has been estimated for different specimen dimensions and materials, as well as for different heating rates. The obtained results suggest that an optimization of experimental parameters, such as the specimen diameter, specimen total and effective length and heating rate, is needed for minimization of the temperature non-uniformity effect.
KEYWORDS
heat conduction, heat radiation, high temperatures, pulse calorimetry, thermophysical properties
PAPER SUBMITTED: 2022-01-15
PAPER REVISED: 2022-02-20
PAPER ACCEPTED: 2022-03-15
PUBLISHED ONLINE: 2022-04-09
DOI REFERENCE: https://doi.org/10.2298/TSCI220115037N
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 4, PAGES [3619 - 3626]
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Temperature non-uniformity due to heat conduction and radiation in the pulse calorimetry technique

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