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Numerical investigation of flow through a triangular duct: the coexistence of laminar and turbulent flow

Daschiel, Gertraud; Frohnapfel, Bettina; Jovanovic, Jovan

Abstract:
Experimental studies of turbulent flow through a triangular duct with small apex angle of 11.5° performed by Eckert and Irvine (1956) show flow laminarisation in the corner region of the duct. This effect is re-investigated using direct numerical simulation (DNS). In order to analyze the impact of duct corners on the flow behavior, results for the friction factor and the mean velocity profiles arising from different non-circular duct geometries, namely a square duct, an equilateral triangular duct and isosceles triangular ducts with an apex angle of 11.5° and 4° are compared with the results for circular pipe flow. Within the cross-sections of the ducts with the small apex angles, regions of essentially laminar and turbulent properties are found to exist simultaneously. From analysis of the turbulent quantities performed exemplary for the 11.5°-triangle we gain further insights into the mechanisms responsible for flow laminarization which are supported by analytical considerations for statistically axisymmetric turbulence.



Originalveröffentlichung
DOI: 10.1016/j.ijheatfluidflow.2013.03.016
Scopus
Zitationen: 15
Web of Science
Zitationen: 13
Zugehörige Institution(en) am KIT Institut für Strömungsmechanik (ISTM)
Publikationstyp Zeitschriftenaufsatz
Jahr 2013
Sprache Englisch
Identifikator ISSN: 0142-727X
KITopen-ID: 1000038404
Erschienen in International Journal of Heat and Fluid Flow
Band 41
Seiten 27-33
Nachgewiesen in Web of Science
Scopus
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