BOILING FLOW SIMULATIONS FOR DEBORA EXPERIMENT USING EULERIAN CFD APPROACH

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F22%3A00359677" target="_blank" >RIV/68407700:21340/22:00359677 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1615/TFEC2022.mph-ii.041182" target="_blank" >https://doi.org/10.1615/TFEC2022.mph-ii.041182</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1615/TFEC2022.mph-ii.041182" target="_blank" >10.1615/TFEC2022.mph-ii.041182</a>

Jazyk výsledku

angličtina

Název v původním jazyce

BOILING FLOW SIMULATIONS FOR DEBORA EXPERIMENT USING EULERIAN CFD APPROACH

Popis výsledku v původním jazyce

To find an appropriate closure and boiling model for subcooled convective boiling flow, CFD simulations based on an Eulerian approach have been performed for the DEBORA experiment, in which upward flow in a vertical heated pipe with the inner diameter of 19.2 mm and the length of 3.5 m was investigated. We developed a modified zero-closure model, which was implemented into Ansys Fluent® code via user defined functions. The main difference between the original and our zero-closure modified model lies in the modeling of the lift-force coefficient. We focused on four selected experimental cases representing different tendency in void fraction profile at the elevation of the outlet, i. e., higher/lower void at the pipe center than that near the wall region. A grid dependency study was first undertaken, followed by a sensitivity analysis of the liftforce coefficient. The modified model could correctly capture the tendency of the void profile, which was not predicted by the original zero-closure model. This result implies the feasibility of the zero-closure model to accurately estimate the subcooled boiling flow through further improvement of its coefficients.

Název v anglickém jazyce

BOILING FLOW SIMULATIONS FOR DEBORA EXPERIMENT USING EULERIAN CFD APPROACH

Popis výsledku anglicky

To find an appropriate closure and boiling model for subcooled convective boiling flow, CFD simulations based on an Eulerian approach have been performed for the DEBORA experiment, in which upward flow in a vertical heated pipe with the inner diameter of 19.2 mm and the length of 3.5 m was investigated. We developed a modified zero-closure model, which was implemented into Ansys Fluent® code via user defined functions. The main difference between the original and our zero-closure modified model lies in the modeling of the lift-force coefficient. We focused on four selected experimental cases representing different tendency in void fraction profile at the elevation of the outlet, i. e., higher/lower void at the pipe center than that near the wall region. A grid dependency study was first undertaken, followed by a sensitivity analysis of the liftforce coefficient. The modified model could correctly capture the tendency of the void profile, which was not predicted by the original zero-closure model. This result implies the feasibility of the zero-closure model to accurately estimate the subcooled boiling flow through further improvement of its coefficients.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

10700 - Other natural sciences

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of the 7th Thermal and Fluids Engineering Conference (TFEC)

ISBN

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ISSN

2379-1748

e-ISSN

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Počet stran výsledku

10

Strana od-do

1539-1548

Název nakladatele

American Society of Thermal and Fluids Engineers

Místo vydání

Danbury

Místo konání akce

Las Vegas, NV

Datum konání akce

15. 5. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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