Flow Boiling Heat Transfer of R134a at Varying Heat Fluxes

Result code in 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>
Result on the web
<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>

Result language
angličtina
Original language name
Flow Boiling Heat Transfer of R134a at Varying Heat Fluxes
Original language description
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.
Czech name
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Czech description
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Type
J<sub>SC</sub> - Article in a specialist periodical, which is included in the SCOPUS database
CEP classification
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OECD FORD branch
20301 - Mechanical engineering

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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