Reliability-Based Criterion for Evaluating Explicit Approximations of Colebrook Equation
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27740%2F22%3A10250396" target="_blank" >RIV/61989100:27740/22:10250396 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.3390/jmse10060803" target="_blank" >https://doi.org/10.3390/jmse10060803</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3390/jmse10060803" target="_blank" >10.3390/jmse10060803</a>
Alternative languages
Result language
angličtina
Original language name
Reliability-Based Criterion for Evaluating Explicit Approximations of Colebrook Equation
Original language description
Numerous explicit approximations of the Colebrook equation have been developed and evaluated based on two criteria: prediction accuracy and computational efficiency. This paper introduces a new evaluation criterion based on the reliability of each equation. The reliability is defined by the coefficient of variation (CV) of the explicit friction factor that is a function of the variabilities of component random variables (roughness height of the internal pipe surface and kinematic viscosity of the fluid). The coefficient of variation of the friction factor depends on its first derivative for roughness height of the inner pipe surface and kinematic viscosity of the fluid and their correlation. Seven explicit approximations were evaluated using the new reliability-based criterion. The results show that all explicit approximations are very reliable, but variations exist regarding the reliability level. The reliabilities of the seven approximations is very close for the rough-flow regime and when the CV of the viscosity is minimal. However, for the smooth-flow regime, and when the CV of the roughness is minimal, various approximations showed substantially different reliabilities. The novelty of the proposed criterion is that it addresses an evaluation dimension that complements the accuracy and efficiency criteria.
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
10300 - Physical sciences
Result continuities
Project
<a href="/en/project/TK03020027" target="_blank" >TK03020027: CEET - Center of Energy and Environmental Technologies</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Marine Science and Engineering
ISSN
2077-1312
e-ISSN
2077-1312
Volume of the periodical
10
Issue of the periodical within the volume
6
Country of publishing house
CH - SWITZERLAND
Number of pages
9
Pages from-to
nestrankovano
UT code for WoS article
000818249100001
EID of the result in the Scopus database
2-s2.0-85132134551