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Title:
Prevajanje toplote skozi vpojne plasti
Authors:
ID
Fras, Maja
(Author)
ID
Slavinec, Mitja
(Mentor)
More about this mentor...
ID
Zavec Pavlinić, Daniela
(Comentor)
Files:
MAG_Fras_Maja_2014.pdf
(2,04 MB)
MD5: CFCA6663CBE36E1704AAC812BFA6A65A
Language:
Slovenian
Work type:
Master's thesis/paper
Typology:
2.09 - Master's Thesis
Organization:
FNM - Faculty of Natural Sciences and Mathematics
Abstract:
V magistrskem delu je predstavljen samostojno narejen fizikalni model in numerična simulacija za opis prevajanja toplote skozi več zaporednih različnih vpojnih plasti, ki so lahko vlažne. Model je enodimenzionalen in temelji na difuzijski enačbi za toplotno prevajanje. Robni pogoj je na eni strani konstantna gostota toplotnega toka. Osnovna predpostavka pri tem je, da prevajanje toplote poteka skozi planparalelne plasti v polneskončni limiti. Model podaja časovno odvisnost temperaturnega polja v smeri prečno na plasti. Ker model upošteva stopnjo vlažnosti, je primeren za opis prevajanja toplote skozi vpojne plasti, med katere lahko uvrščamo tudi tekstilne materiale. Simulacija je testirana na analitično rešljivem primeru in s primerjavo rezultatov eksperimentalnih meritev prevajanja toplote skozi različne konfiguracije zaščitnih oblačilnih sistemov (zaščitna obleka in pod njo suho oziroma mokro spodnje perilo). Eksperimentalne meritve so bile opravljene s posebno požarno lutko, opremljeno s temperaturnimi senzorji, ki je namenjena simulaciji eksplozivnega ognja in se uporablja za testiranje osebne zaščitne opreme. Glede na ujemanje rezultatov simulacije s tistimi, ki so bili eksperimentalno izmerjeni, lahko s prepričanjem trdimo, da z uporabljenim modelom dobro opišemo dinamično temperaturno polje več plasti oblačil za različne časovne periode in jakosti izpostavljenosti plamenu. Numerične simulacije omogočajo razširitev za poljubno mnogo različnih plasti oblačil, kar omogoča analizo meritev toplotnega prevajanja skozi različna oblačila, analizo destruktivnih sprememb zaščitne obleke in uporabo pri vzpostavljanju standardov zaščitnih oblačil.
Keywords:
toplota
,
toplotno prevajanje
,
izparevanje
,
temperatura
,
metoda končnih diferenc
,
požarna lutka
,
zaščitna oblačila
Place of publishing:
Maribor
Publisher:
[M. Fras]
Year of publishing:
2014
PID:
20.500.12556/DKUM-44745
UDC:
536.2:612(043.2)
COBISS.SI-ID:
20734216
NUK URN:
URN:SI:UM:DK:NX8TZBRO
Publication date in DKUM:
24.07.2014
Views:
2525
Downloads:
185
Metadata:
Categories:
FNM
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:
FRAS, Maja, 2014,
Prevajanje toplote skozi vpojne plasti
[online]. Master’s thesis. Maribor : M. Fras. [Accessed 4 April 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=44745
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Secondary language
Language:
English
Title:
Heat conducting through damp layers
Abstract:
This thesis presents a physical model and a numerical simulation of heat transfer through successive layers of different absorbent, which may be damp. The model is one-dimensional and is based on the heat diffusion equation for the heat transfer. Boundary condition on the outside surface is a constant heat flow density. The main assumption in the model is that the heat transfers through plan-parallel semi-infinite layers. The model gives the time dependence of the temperature field in the direction perpendicular to the layers. It takes into account the level of humidity, so it is suitable for the absorbent layers such as textiles. The simulation is tested for a simple analytically solvable case. Also, we compared simulation results with experimental measurements of heat transfer through different configurations of clothing (protective clothing and dry or wet underwear). The experimental measurements were performed using s system based on flame mannequin equipped with temperature sensors. According to the matching of simulation results with experimental measured results, it can be asserted that the used model displays good results of the dynamical temperature field in the clothing layers for fire exposures of different duration and intensity. Numerical simulations allow for the extension of any number of different layers, thereby allowing measurements of heat conduction through different clothing, the analysis of destructive modifications of protective clothing and application to new protective clothing standards.
Keywords:
heat
,
heat transfer
,
vaporization
,
temperature
,
finite element method
,
fire doll
,
protective clothing
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