Laboratory for Thermal Engineering and Energy

The purpose of this work is to improve and apply one and establish and develop another pulse method for the measurements of thermal diffusivity and thermal contact resistance of thin layers deposited on substrate. To carry out this mission, the work is directed toward three following axes:

• I) Theoretical studies, which include analytical and numerical considerations of partial differential equations of heat conduction for corresponding initial and boundary conditions.
• II) Theoretical studies, which consist of methods and procedures of parameter estimation, appropriate for general and particular problem.
• III) Experimental studies, which imply use and development of the experimental setup, as well as the performance of different experiments.

During the first phase, one established several models that corresponded to one- and two-dimensional heat conduction through a two-layered system, implying general and particular initial and boundary conditions. In the second phase, for a study of the estimation possibilities of unknown parameters, as it has been the thermal diffusivity of thin layer, one applied and developed two different estimation procedures: first, a direct procedure, which implied the treatment of original parameters, and second, an optimal procedure that dealt with modified parameters. Both of procedures took into the account the finite uncertainties of known parameters. Finally, in the last phase, one studied experimental problems appropriate to existing experimental setup and to measurement itself, then established another setup for two-dimensional measurements, and, finally, applied devices, procedures, and theoretical models obtained from the first two phases, to real different samples with thin layers.

PHD Thesis (in Serbian - full version)(pdf, 4.46 MB)