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1.
Measurements of material heat transfer properties : master study programme
Miha Donša, 2022, magistrsko delo

Opis: An experimental setup was created to observe temperature change at two points inside the experimental body. Such an experimental setup created data that was used as an anchor point of optimization that was coupled with numerical models to find unknown variables of heat conductivity and specific heat of the materials. Two numerical models were created. A 1D numerical model was created for possibilities of fast optimization ignoring the insulation and heat transfer through it. Such a model did not manage to describe the experimental setup accurately. Therefore, a 3D numerical model was created simulating the whole experimental setup and yielded much more promising results. Problems with the model were soon seen when experimental data was compared to the numerical solution where variables that were initially not taken into the account showed a much greater effect than first anticipated. Therefore, the 3D numerical model was adjusted to describe the experimental setup as accurately as possible. The experiment was done with two different materials. The materials were picked based on their heat conductivity (high and low). High heat conductivity material was easy to understand and to find a solution to it. With low conductivity material, some problems were quickly observed and as such created a lot of questions as to why and how to find the unknown variables of the material. It was then shown that the masses of the materials in the experiment and the length of the experiment played the most important role in the experiment and quickly explained why and how the experimental setup should be modified to obtain better results.
Ključne besede: heat transfer, material heat transfer properties, specific heat, heat conductivity, optimization, numerical simulation of heat transfer
Objavljeno v DKUM: 07.07.2022; Ogledov: 765; Prenosov: 45
.pdf Celotno besedilo (6,54 MB)

2.
Določevanje emisivnosti biološkemu tkivu
Miha Donša, 2017, diplomsko delo

Opis: V diplomskem delu se ugotavlja, kako bi lahko na enostaven in vsem dostopen način izmerili emisivnost biološkega tkiva. Uporabili smo kupolo, ki smo jo izdelali sami in termalno kamero (FLIR IR 655sc, FLIR Systems, USA). Emisivnost biološkega tkiva smo tako določevali v kontroliranem območju v katerem smo zadrževali konstantno temperaturo, ter opazovali okoliške parametre pomembne za tak način merjenja emisivnosti. Dobljene rezultate smo nato primerjali z izračunom po algoritmu, ki se uporablja za merjenje temperature.
Ključne besede: toplotno sevanje, emisivnost, merjenje, biološko tkivo
Objavljeno v DKUM: 04.09.2017; Ogledov: 1415; Prenosov: 252
.pdf Celotno besedilo (3,02 MB)

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