Evaporation of refrigerant R134a, R404A and R407C with low mass flux in smooth vertical tube
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F21%3APU141627" target="_blank" >RIV/00216305:26110/21:PU141627 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0017931021009509" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0017931021009509</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.ijheatmasstransfer.2021.121845" target="_blank" >10.1016/j.ijheatmasstransfer.2021.121845</a>
Alternative languages
Result language
angličtina
Original language name
Evaporation of refrigerant R134a, R404A and R407C with low mass flux in smooth vertical tube
Original language description
This experimental study analysis the low mass flux of refrigerant R134a, R404A, and R407C in the smooth vertical evaporator tube with an inner diameter of 32 mm. This downward-flow refrigerant with a mass flux of about 9 kg m −2 s −1 in the parallel/counter flow of heating water shows suppressed heat trans- fer by convective boiling and dominant heat transfer by nucleate boiling. This dominant heat transfer by nucleate boiling is dependent on the superheated wall of evaporator tube. The experimentally obtained Nusselt number correlates 92.2 % for R134a, 92.4 % for R404A, and 83.2 % for R407C with the predicted Nusselt number for mass flux over 10 kg m −2 s −1 . In summary, the untypically low mass flux of refrig- erant about 9 kg m −2 s −1 is comparable with the current state of knowledge for low mass flux over 10 kg m −2 s −1 .
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20101 - Civil engineering
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
International journal of heat and mass transfer
ISSN
0017-9310
e-ISSN
1879-2189
Volume of the periodical
181
Issue of the periodical within the volume
1
Country of publishing house
GB - UNITED KINGDOM
Number of pages
8
Pages from-to
1-8
UT code for WoS article
000709735900001
EID of the result in the Scopus database
2-s2.0-85115222915