A new approach for predicting the pool boiling heat transfer coefficient of refrigerant R141b and its mixtures with surfactant and nanoparticles using experimental data

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F20%3A00541370" target="_blank" >RIV/61388998:_____/20:00541370 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007%2Fs10973-020-09479-0" target="_blank" >https://link.springer.com/article/10.1007%2Fs10973-020-09479-0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10973-020-09479-0" target="_blank" >10.1007/s10973-020-09479-0</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A new approach for predicting the pool boiling heat transfer coefficient of refrigerant R141b and its mixtures with surfactant and nanoparticles using experimental data

Popis výsledku v původním jazyce

In the present study, the pool boiling process for the refrigerant R141b and its mixtures with Span 80 surfactant and TiO2 nanoparticles has been examined. The results for the heat transfer coefficient (HTC) were taken at various boiling pressures (0.2, 0.3, 0.4 MPa) in the range of the heat fluxes 5.8-56.4 kW m(-2) and for the internal boiling characteristics (IBC) such as the bubble departure diameter, frequency and velocity of bubble growth at atmospheric pressure in the range of the heat fluxes 29.6-57.0 kW m(-2). We found that the additives of Span 80 and Span 80/TiO2 nanoparticles enhance the HTC at the lower heat flux densities and pressures. However, at higher values of the heat flux and pressure the HTC was deteriorated by the additives. At the same time, no significant impact was obtained for the IBCs. An analysis of the Rensselaer Polytechnic Institute model performance for the case when experimental data on the nucleation sites density is unavailable has revealed no qualitative agreement between experimental and predicted data on the HTC. Thus, we proposed a new approach that combines limited set of the experimental data (LSED) with correlations of the IBC's versus heat flux and pressure. Finally, the LSED allowed to achieve both qualitative and quantitative agreement (within +/- 10%) between predicted and experimental data on the HTC.

Název v anglickém jazyce

A new approach for predicting the pool boiling heat transfer coefficient of refrigerant R141b and its mixtures with surfactant and nanoparticles using experimental data

Popis výsledku anglicky

In the present study, the pool boiling process for the refrigerant R141b and its mixtures with Span 80 surfactant and TiO2 nanoparticles has been examined. The results for the heat transfer coefficient (HTC) were taken at various boiling pressures (0.2, 0.3, 0.4 MPa) in the range of the heat fluxes 5.8-56.4 kW m(-2) and for the internal boiling characteristics (IBC) such as the bubble departure diameter, frequency and velocity of bubble growth at atmospheric pressure in the range of the heat fluxes 29.6-57.0 kW m(-2). We found that the additives of Span 80 and Span 80/TiO2 nanoparticles enhance the HTC at the lower heat flux densities and pressures. However, at higher values of the heat flux and pressure the HTC was deteriorated by the additives. At the same time, no significant impact was obtained for the IBCs. An analysis of the Rensselaer Polytechnic Institute model performance for the case when experimental data on the nucleation sites density is unavailable has revealed no qualitative agreement between experimental and predicted data on the HTC. Thus, we proposed a new approach that combines limited set of the experimental data (LSED) with correlations of the IBC's versus heat flux and pressure. Finally, the LSED allowed to achieve both qualitative and quantitative agreement (within +/- 10%) between predicted and experimental data on the HTC.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Journal of Thermal Analysis and Calorimetry

ISSN

1388-6150

e-ISSN

—

Svazek periodika

142

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

HU - Maďarsko

Počet stran výsledku

13

Strana od-do

2327-2339

Kód UT WoS článku

000518344400005

EID výsledku v databázi Scopus

2-s2.0-85081674150