RANS simulations of turbulent and thermal mixing in a T-junction/Suoliu modeliavimas T jungtyse turbulentinio ir silumos maisymo sistemose

The turbulent and thermal mixing in a horizontally oriented T-junction is investigated numerically. The objective of the present study is to determine the mixing length in a T-junction where homogeneous temperature distribution is established in the cross section. A steady state three-dimensional tu...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Mechanika (Kaunas, Lithuania : 1995) Lithuania : 1995), 2013-05, Vol.19 (3), p.277
Hauptverfasser: Aounallah, M, Belkadi, M, Adjlout, L, Imine, O
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The turbulent and thermal mixing in a horizontally oriented T-junction is investigated numerically. The objective of the present study is to determine the mixing length in a T-junction where homogeneous temperature distribution is established in the cross section. A steady state three-dimensional turbulent flow is considered with a Reynolds number of 0.7 x [10.sup.5] at the inlet of the main cold pipe. Grid is generated in a stretched manner so that strong gradients near the wall regions are accounted for as required. Four turbulence models are tested to provide closure for the Reynolds stress tensor: the k-ζ standard, the k-ω standard, the k-ω SST and the RSM models. For all simulated cases, good qualitative agreement is obtained. Quantitative comparisons show that the standard k-e and the RSM models give too low or high predictions, whereas both k-ω models are reasonably close between them. It is found that a length of 80 inch is enough to get homogenous temperature if a tolerance of 1°C is considered. Further simulations on a longer pipe are strongly encouraged to assist in elucidating the length mixing determination.
ISSN:1392-1207
DOI:10.5755/j01.mech.19.3.4663