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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Comparison of Turbulence Models in Simulating a Cruciform Impinging Jet on a Flat Wall

Florin Bode
Technical University of Cluj-Napoca

Kodjovi Sodjavi
LaSIE, University of La Rochelle, Pole Sciences et Technologie, Avenue Michel Crépeau, 17042 La Rochelle, France

Amina Meslem
University of La Rochelle

Ilinca Nastase
CAMBI Research Center, Technical University of Civil Engineering in Bucharest, Building Services Faculty, Avenue Pache Protopescu 66, Bucharest, Romania

DOI: 10.1615/IHTC15.nsm.009371
pages 5911-5923


KEY WORDS: Computational methods, Numerical simulation, Heat transfer enhancement, Electrodiffusion, PIV, Impinging jet

Abstract

A Computational Fluid Dynamics (CFD) investigation of impinging lobed jet issuing from a cruciform orifice nozzle was conducted at a Reynolds number of 5290. Our experimental data [1] were used to evaluate the capability of eight turbulence models, in the prediction of the radial distribution of the wall shear rate (?, s-1 ). The electrodiffusion method was used for ?-measurements. The flow fields in two longitudinal planes (the major plane MP passing by two orifice lobes, and the minor plane mP passing by two orifice troughs) were captured using Particle Image Velocimetry (PIV). The CFD investigation is conducted using steady RANS numerical simulations in combination with a range of turbulence models to provide closure. The turbulence models evaluated are: SST k-?, k-? standard, trans SST, k-? realizable, RNG k-?, k-? standard, kkl-?, and RSM. The study reveals that none of the turbulence models is able to predict well all jet characteristics in the same time. For example, the maximum wall shear rate was underestimated by all the models, except by k-kl-?. The best results for normalized wall shear rate distributions were obtained by SST k-?. The inflection point in wall shear rate distribution found experimentally on the minor plane at 1.4De was present only for this turbulence model. None of the turbulence model could predict the streamwise centerline velocity decay in the free wall effect region, but all of them, except k-? standard, were close to the experimental data in the region affected by the presence of the impinging wall.

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