| Journal: | Journal of the Brazilian Society of Mechanical Sciences and Engineering |
| Database: | PERIÓDICA |
| System number: | 000312181 |
| ISSN: | 1678-5878 |
| Authors: | Silva, S.M.M. de Lima e1 Ong, T.H Guimaraes, G1 |
| Institutions: | 1Universidade Federal de Uberlandia, Escola de Engenharia Mecanica, Uberlandia, Minas Gerais. Brasil |
| Year: | 2003 |
| Season: | Ene-Mar |
| Volumen: | 25 |
| Number: | 1 |
| Pages: | 9-14 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental |
| English abstract | This work describes an experimental technique for obtaining, simultaneously, the thermal diffusivity and thermal conductivity of polymer materials. This technique uses experimental data from only one of the sample surfaces. It means functions using experimental and calculated temperature are defined. An objective function representing the eigenvalue phase angle is used to determine thermal diffusivity, while a least square error function is used for the thermal conductivity estimation. The sequential unconstrained optimization technique BFGS is used to calculate the search direction. In each case the golden section method is used in a one-dimensional search, followed by a polynomial approximation. A comparison with the flash method and the guarded hot plate method gives a deviation of 2.97 % and 0.63 % for thermal diffusivity and thermal conductivity, respectively, for a Polychloroethylene (PVC) sample. An uncertainty analysis is also presented |
| Disciplines: | Ingeniería, Física y astronomía |
| Keyword: | Ingeniería de materiales, Termodinámica y física estadística, Polímeros, Propiedades térmicas, Medición, Parámetros, Conducción de calor, Problema inverso |
| Keyword: | Engineering, Physics and astronomy, Materials engineering, Thermodynamics and statistical physics, Polymers, Thermal properties, Measurement, Parameters, Heat conduction, Inverse problems |
| Full text: | Texto completo (Ver HTML) |
