Heat transfer from glass melt to cold cap: Computational fluid dynamics study of cavities beneath cold cap

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F21%3A43923510" target="_blank" >RIV/60461373:22310/21:43923510 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985891:_____/21:00541193

Výsledek na webu

<a href="https://ceramics.onlinelibrary.wiley.com/doi/10.1111/ijag.15863" target="_blank" >https://ceramics.onlinelibrary.wiley.com/doi/10.1111/ijag.15863</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/ijag.15863" target="_blank" >10.1111/ijag.15863</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Heat transfer from glass melt to cold cap: Computational fluid dynamics study of cavities beneath cold cap

Popis výsledku v původním jazyce

Efficient glass production depends on the continuous supply of heat from the glass melt to the floating layer of batch, or cold cap. Computational fluid dynamics (CFD) are employed to investigate the formation and behavior of gas cavities that form beneath the batch by gases released from the collapsing primary foam bubbles, ascending secondary bubbles, and in the case of forced bubbling, from the rising bubbling gas. The gas phase fraction, temperature, and velocity distributions below the cold cap are used to calculate local and average heat transfer rates as a function of the bubbling rate. It is shown that the thickness of the cavities is nearly independent of the cold cap shape and the amount of foam evolved during batch conversion. It is ~7 mm and up to ~15 mm for the cases without and with forced bubbling used to promote circulation within the melt, respectively. Using computed velocity and temperature profiles, the melting rate of the simulated high-level nuclear waste glass batch was estimated to increase with the bubbling rate to the power of ~0.3 to 0.9, depending on the flow pattern. The simulation results are in good agreement with experimental data from laboratory- and pilot-scale melter tests.

Název v anglickém jazyce

Heat transfer from glass melt to cold cap: Computational fluid dynamics study of cavities beneath cold cap

Popis výsledku anglicky

Efficient glass production depends on the continuous supply of heat from the glass melt to the floating layer of batch, or cold cap. Computational fluid dynamics (CFD) are employed to investigate the formation and behavior of gas cavities that form beneath the batch by gases released from the collapsing primary foam bubbles, ascending secondary bubbles, and in the case of forced bubbling, from the rising bubbling gas. The gas phase fraction, temperature, and velocity distributions below the cold cap are used to calculate local and average heat transfer rates as a function of the bubbling rate. It is shown that the thickness of the cavities is nearly independent of the cold cap shape and the amount of foam evolved during batch conversion. It is ~7 mm and up to ~15 mm for the cases without and with forced bubbling used to promote circulation within the melt, respectively. Using computed velocity and temperature profiles, the melting rate of the simulated high-level nuclear waste glass batch was estimated to increase with the bubbling rate to the power of ~0.3 to 0.9, depending on the flow pattern. The simulation results are in good agreement with experimental data from laboratory- and pilot-scale melter tests.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

<a href="/cs/project/GA19-14179S" target="_blank" >GA19-14179S: In-situ analýza chování vrstvy pěny na rozhraní kmene a taveniny za použití modelové tavicí pece</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

International Journal of Applied Glass Science

ISSN

2041-1286

e-ISSN

—

Svazek periodika

12

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

233-244

Kód UT WoS článku

000604271500001

EID výsledku v databázi Scopus

2-s2.0-85099012449