Flow Boiling Heat Transfer of R134a at Varying Heat Fluxes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24210%2F23%3A00011437" target="_blank" >RIV/46747885:24210/23:00011437 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.11159/jffhmt.2023.007" target="_blank" >https://doi.org/10.11159/jffhmt.2023.007</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.11159/jffhmt.2023.007" target="_blank" >10.11159/jffhmt.2023.007</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Flow Boiling Heat Transfer of R134a at Varying Heat Fluxes

Popis výsledku v původním jazyce

This study presents an experimental analysis of flow boiling heat transfer of R134a refrigerant in a smooth horizontal stainless-steel tube with the goal of investigating the effect of heat flux on heat transfer coefficient and dry-out characteristics. The experiment was performed for heat fluxes ranging from 7.2 kW/m2 to 47.4 kW/m2, mass flux of 300 kg/m2s and saturation pressure of 460 kPa. The results showed that at low heat fluxes, the heat transfer is predominantly controlled by convective boiling with a higher slope of heat transfer coefficient. As heat flux increases, nucleate boiling begins to predominate the heat transfer. The predominance of nucleate boiling is strongly experienced at low vapor quality when the higher slope in convective boiling begins to disappear as nucleate boiling dominates. Dry-out vapor quality incipience is not affected appreciably by heat flux. All the dry-out vapor quality incipience correlations investigated predicted well the vapor quality for which dry-out begins and ends.

Název v anglickém jazyce

Flow Boiling Heat Transfer of R134a at Varying Heat Fluxes

Popis výsledku anglicky

This study presents an experimental analysis of flow boiling heat transfer of R134a refrigerant in a smooth horizontal stainless-steel tube with the goal of investigating the effect of heat flux on heat transfer coefficient and dry-out characteristics. The experiment was performed for heat fluxes ranging from 7.2 kW/m2 to 47.4 kW/m2, mass flux of 300 kg/m2s and saturation pressure of 460 kPa. The results showed that at low heat fluxes, the heat transfer is predominantly controlled by convective boiling with a higher slope of heat transfer coefficient. As heat flux increases, nucleate boiling begins to predominate the heat transfer. The predominance of nucleate boiling is strongly experienced at low vapor quality when the higher slope in convective boiling begins to disappear as nucleate boiling dominates. Dry-out vapor quality incipience is not affected appreciably by heat flux. All the dry-out vapor quality incipience correlations investigated predicted well the vapor quality for which dry-out begins and ends.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

20301 - Mechanical engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Journal of fluid flow, heat and mass transfer

ISSN

23686111

e-ISSN

—

Svazek periodika

10

Číslo periodika v rámci svazku

08

Stát vydavatele periodika

CA - Kanada

Počet stran výsledku

11

Strana od-do

43-50

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85168943116