izpis_h1_title_alt

Impact of neglecting the variations in the relative surface roughnesses of capillary tubes on the accuracy of a capillary tube model
ID Lorbek, Luka (Avtor), ID Katrašnik, Tomaž (Avtor), ID Kitanovski, Andrej (Avtor)

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Izvleček
Capillary tube models frequently rely on friction factor correlations, which are functions of the Reynolds number, and the tube's relative surface roughness. However, this study shows that explicitly correlating the friction factor with the relative surface roughness is unnecessary, at least when the latter is lower than 0.0025. To test this a correlation was fitted directly onto friction factor measurements obtained in an adiabatic flow of R600a, through nine capillary tubes from three manufacturers. The friction factor was correlated exclusively as a function of the Reynolds number, meaning that the impacts of the relative surface roughnesses on the friction factor were averaged, and included only implicitly. This correlation, and an existing correlation, which allows the specification of the relative surface roughness, were then implemented in a capillary tube model. The accuracy of the capillary tube model, using either the developed or existing correlation was then evaluated by comparing the results to experimental data. No significant decrease in the accuracy of the model was observed when the relative surface roughnesses, ranging from 0.0012 to 0.0025, were not individually specified for each capillary tube. To further verify this, the procedure was repeated on a larger database of friction factor and mass flow rate measurements, which also consisted of data from independent studies. Similar conclusions were drawn, as the average accuracy of the model differed only by 1 to 3% among different studies, and not always in favor of the correlation where the relative surface roughnesses could be specified.

Jezik:Angleški jezik
Ključne besede:vapor-compression system, refrigerant flow, capillary tubes, relative surface roughness, friction factor correlation
Vrsta gradiva:Članek v reviji
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Status publikacije:Objavljeno
Različica publikacije:Recenzirani rokopis
Leto izida:2021
Št. strani:Str. 194-203
Številčenje:Vol. 129
PID:20.500.12556/RUL-128036 Povezava se odpre v novem oknu
UDK:621.56:519.8(045)
ISSN pri članku:0140-7007
DOI:10.1016/j.ijrefrig.2021.04.022 Povezava se odpre v novem oknu
COBISS.SI-ID:61519619 Povezava se odpre v novem oknu
Datum objave v RUL:01.07.2021
Število ogledov:888
Število prenosov:61
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Gradivo je del revije

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

Licence

Licenca:CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
Opis:Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.
Začetek licenciranja:19.04.2021

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:parno-kompresijski sistemi, tok hladiva, kapilarne cevi, relativna hrapavost, faktor trenja

Projekti

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Program financ.:Mladi raziskovalci

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