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Two-phase flow patterns in adiabatic refrigerant flow through capillary tubes
ID
Lorbek, Luka
(
Author
),
ID
Kuhelj, Anja
(
Author
),
ID
Dular, Matevž
(
Author
),
ID
Kitanovski, Andrej
(
Author
)
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Abstract
This paper presents the results of an experimental study of the flow visualization of the refrigerant R600a through a capillary tube with an internal diameter of 0.8 mm made from an FEP (fluorinated ethylene propylene) polymer that was installed in a small-scale vapor-compression refrigeration system. The main purpose of the study was to determine the flow patterns of the refrigerant flow in capillary tubes under different operating conditions and to verify whether the results obtained using an FEP tube are representative for the flow of a refrigerant in copper capillary tubes. The results of the study revealed that the two-phase refrigerant flow in the FEP capillary tubes consists predominantly of a heterogenous flow composed of slugs, which continuously expand downstream. It was also found that at higher inlet pressures the frequency at which the vapor inception occurs is higher than at lower pressures. In addition, an experimental study of the effect of local or global imperfections on the inner surface of the FEP tube was performed. In some cases, the imperfections increased the number of vapor bubble inception points, which caused a homogenization of the two-phase flow.
Language:
English
Keywords:
refrigeration
,
vapor-compression system
,
refrigerant flow
,
capillary tube
,
evaporation
,
flow visualization
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Version of Record
Year:
2020
Number of pages:
Str. 107-116
Numbering:
Vol. 115
PID:
20.500.12556/RUL-124219
UDC:
621.56(045)
ISSN on article:
0140-7007
DOI:
10.1016/j.ijrefrig.2020.02.030
COBISS.SI-ID:
17060891
Publication date in RUL:
08.01.2021
Views:
1126
Downloads:
364
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Record is a part of a journal
Title:
International journal of refrigeration
Shortened title:
Int. j. refrig.
Publisher:
Elsevier Science
ISSN:
0140-7007
COBISS.SI-ID:
9140997
Secondary language
Language:
French
Title:
Configurations d’écoulement diphasique pour un écoulement de frigorigène adiabatique à travers des tubes capillaires
Keywords:
système à compression de vapeur
,
écoulement de frigorigène
,
tube capillaire
,
évaporation instantanée
,
visualisation de l’écoulement
Projects
Funder:
ARRS - Slovenian Research Agency
Funding programme:
Mladi raziskovalci
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