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Impact of neglecting the variations in the relative surface roughnesses of capillary tubes on the accuracy of a capillary tube model
ID
Lorbek, Luka
(
Author
),
ID
Katrašnik, Tomaž
(
Author
),
ID
Kitanovski, Andrej
(
Author
)
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https://www.sciencedirect.com/science/article/pii/S014070072100147X#ack0001
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Abstract
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.
Language:
English
Keywords:
vapor-compression system
,
refrigerant flow
,
capillary tubes
,
relative surface roughness
,
friction factor correlation
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FS - Faculty of Mechanical Engineering
Publication status:
Published
Publication version:
Author Accepted Manuscript
Year:
2021
Number of pages:
Str. 194-203
Numbering:
Vol. 129
PID:
20.500.12556/RUL-128036
UDC:
621.56:519.8(045)
ISSN on article:
0140-7007
DOI:
10.1016/j.ijrefrig.2021.04.022
COBISS.SI-ID:
61519619
Publication date in RUL:
01.07.2021
Views:
1029
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76
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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
Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:
19.04.2021
Secondary language
Language:
Slovenian
Keywords:
parno-kompresijski sistemi
,
tok hladiva
,
kapilarne cevi
,
relativna hrapavost
,
faktor trenja
Projects
Funder:
ARRS - Slovenian Research Agency
Funding programme:
Mladi raziskovalci
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