How Does Uncertainty Of Thermal Conductivity Impact Measurements Of Pool Boiling Heat Transfer Coefficient?

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F21%3A00355241" target="_blank" >RIV/68407700:21220/21:00355241 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.icct.cz/cs/Amca-ICCT/media/content/2021/proceedings/ICCT2021-Proceedings.pdf" target="_blank" >https://www.icct.cz/cs/Amca-ICCT/media/content/2021/proceedings/ICCT2021-Proceedings.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

How Does Uncertainty Of Thermal Conductivity Impact Measurements Of Pool Boiling Heat Transfer Coefficient?

Popis výsledku v původním jazyce

This work analyzes how value of thermal conductivity of a tested sample impact pool boiling heat transfer coefficients (HTCs) measured with a common experimental apparatus. A typical measurement of pool boiling HTC is based on 1D conduction in a heated block. Temperature of the boiling surface and heat flux are both calculated from temperature distribution inside the block. Value of thermal conductivity of the block is needed for calculation of heat flux and resulting HTC. Researchers seldom measure thermal conductivity of their samples. A certain value, which corresponds to the material of the investigated sample, is typically adopted from the literature and considered to be independent of temperature. This approach is sometimes criticized as it might lead to significant measurement errors. This contribution quantifies the impact of thermal conductivity and its uncertainty on resulting HTC. For our pool boiling apparatus, it was found out that uncertainty of heat transfer coefficient remains acceptable even when uncertainty of thermal conductivity is purposely overvalued. Furthermore, it was found out that neglecting temperature dependency of thermal conductivity does not lead to substantial errors of resulting HTC.

Název v anglickém jazyce

How Does Uncertainty Of Thermal Conductivity Impact Measurements Of Pool Boiling Heat Transfer Coefficient?

Popis výsledku anglicky

This work analyzes how value of thermal conductivity of a tested sample impact pool boiling heat transfer coefficients (HTCs) measured with a common experimental apparatus. A typical measurement of pool boiling HTC is based on 1D conduction in a heated block. Temperature of the boiling surface and heat flux are both calculated from temperature distribution inside the block. Value of thermal conductivity of the block is needed for calculation of heat flux and resulting HTC. Researchers seldom measure thermal conductivity of their samples. A certain value, which corresponds to the material of the investigated sample, is typically adopted from the literature and considered to be independent of temperature. This approach is sometimes criticized as it might lead to significant measurement errors. This contribution quantifies the impact of thermal conductivity and its uncertainty on resulting HTC. For our pool boiling apparatus, it was found out that uncertainty of heat transfer coefficient remains acceptable even when uncertainty of thermal conductivity is purposely overvalued. Furthermore, it was found out that neglecting temperature dependency of thermal conductivity does not lead to substantial errors of resulting HTC.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20301 - Mechanical engineering

Projekt

<a href="/cs/project/EF16_019%2F0000753" target="_blank" >EF16_019/0000753: Centrum výzkumu nízkouhlíkových energetických technologií</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the 8th International Conference on Chemical Technology

ISBN

978-80-88307-08-2

ISSN

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e-ISSN

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Počet stran výsledku

5

Strana od-do

316-320

Název nakladatele

Czech Society of Industrial Chemistry

Místo vydání

Prague

Místo konání akce

Mikulov

Datum konání akce

3. 5. 2021

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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