Thermal properties determination of a cylindrical product during its cooling: two-dimensional numerical model and uncertainty.

Autor:	da Silva, Wilton Pereira, D. P. S. e Silva, Cleide Maria, De Souto, Leidjane Matos, Gomes, Josivanda Palmeira, J. M. Queiroz, Alexandre, De Figueiredo, Rossana M. F.
Předmět:	TWO-dimensional models HEAT transfer coefficient THERMAL properties THERMAL diffusivity COOLING COVARIANCE matrices
Zdroj:	International Journal of Food Properties; 2019, Vol. 22 Issue 1, p343-354, 12p, 3 Diagrams, 1 Chart, 3 Graphs
Abstrakt:	In this article, a two-dimensional model is proposed to determine thermal diffusivity and convective heat transfer coefficient, providing the average values, their uncertainties and the covariance matrix referring to these parameters for a product with cylindrical geometry during its cooling. The proposed model used a two-dimensional numerical solution of the diffusion equation for the direct problem; an experimental dataset referring to the cooling kinetics in the center of the product and an optimizer program based on the Levenberg-Marquardt algorithm for the inverse problem. The model was used with success to determine the thermal properties, their uncertainties and the covariance matrix of a cucumber during its cooling. The obtained results allowed establishing a confidence band that made it possible to graphically evaluate the precision of a new simulation for a cucumber with different dimensions. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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