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Two-phase flow patterns in adiabatic refrigerant flow through capillary tubes
Lorbek, Luka (Avtor), Kuhelj, Anja (Avtor), Dular, Matevž (Avtor), Kitanovski, Andrej (Avtor)

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Izvleček
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.

Jezik:Angleški jezik
Ključne besede:refrigeration, vapor-compression system, refrigerant flow, capillary tube, evaporation, flow visualization
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Leto izida:2020
Št. strani:Str. 107-116
Številčenje:Vol. 115
UDK:621.56(045)
ISSN pri članku:0140-7007
DOI:10.1016/j.ijrefrig.2020.02.030 Povezava se odpre v novem oknu
COBISS.SI-ID:17060891 Povezava se odpre v novem oknu
Število ogledov:109
Število prenosov:57
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
 
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Gradivo je del revije

Naslov:International journal of refrigeration
Skrajšan naslov:Int. j. refrig.
Založnik:Elsevier
ISSN:0140-7007
COBISS.SI-ID:9140997 Povezava se odpre v novem oknu

Gradivo je financirano iz projekta

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Program financ.:Mladi raziskovalci
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Sekundarni jezik

Jezik:Francoski jezik
Naslov:Configurations d’écoulement diphasique pour un écoulement de frigorigène adiabatique à travers des tubes capillaires
Ključne besede:système à compression de vapeur, écoulement de frigorigène, tube capillaire, évaporation instantanée, visualisation de l’écoulement

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