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Comparison between theoretical CFV flow models and NIST’s primary flow data in the laminar, turbulent, and transition flow regimes / Aaron Johnson in Transactions of the ASME . Journal of fluids engineering, Vol. 130 N° 7 (Juillet 2008) 

Public ISBD [article]  in Transactions of the ASME . Journal of fluids engineering > Vol. 130 N° 7 (Juillet 2008) . - 11 p. Titre : Comparison between theoretical CFV flow models and NIST’s primary flow data in the laminar, turbulent, and transition flow regimes Type de document : texte imprimé Auteurs : Aaron Johnson, Auteur ; John Wright, Auteur Année de publication : 2014 Article en page(s) : 11 p. Note générale : Fluids engineering Langues : Anglais (eng) Mots-clés : CFV  flow  model;  NIST's  primary  flow  data;  Reynolds  number;  laminar  regime;  transition;  turbulent  flow  regimes Résumé : State-of-the art dimensional metrology was used to measure the throat diameter and throat curvature of nine critical flow venturis (CFVs) with nominal throat diameters ranging from 5mmto25mm. The throat curvature was used in calculating the theoretical discharge coefficients, while the throat diameter was used in computing the experimental discharge coefficients. The nine CFVs were calibrated in dry air using two NIST primary flow standards with expanded uncertainties of 0.05% and 0.09%, respectively. The calibration data span a Reynolds number range from 7.2×104 to 2.5×106, including laminar, transition, and turbulent flow regimes. By correcting for both the throat diameter and curvature, the agreement between predicted and measured discharge coefficients was less than 0.17% in the turbulent regime and less than 0.07% in the laminar regime. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...] [article] Comparison between theoretical CFV flow models and NIST’s primary flow data in the laminar, turbulent, and transition flow regimes [texte imprimé] / Aaron Johnson, Auteur ; John Wright, Auteur . - 2014 . - 11 p. Fluids engineering Langues : Anglais (eng) in Transactions of the ASME . Journal of fluids engineering > Vol. 130 N° 7 (Juillet 2008) . - 11 p. Mots-clés : CFV  flow  model;  NIST's  primary  flow  data;  Reynolds  number;  laminar  regime;  transition;  turbulent  flow  regimes Résumé : State-of-the art dimensional metrology was used to measure the throat diameter and throat curvature of nine critical flow venturis (CFVs) with nominal throat diameters ranging from 5mmto25mm. The throat curvature was used in calculating the theoretical discharge coefficients, while the throat diameter was used in computing the experimental discharge coefficients. The nine CFVs were calibrated in dry air using two NIST primary flow standards with expanded uncertainties of 0.05% and 0.09%, respectively. The calibration data span a Reynolds number range from 7.2×104 to 2.5×106, including laminar, transition, and turbulent flow regimes. By correcting for both the throat diameter and curvature, the agreement between predicted and measured discharge coefficients was less than 0.17% in the turbulent regime and less than 0.07% in the laminar regime. En ligne : http://fluidsengineering.asmedigitalcollection.asme.org/issue.aspx?journalid=122 [...]