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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN Print: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2015014345
pages 489-507

NUMERICAL INVESTIGATION OF ROUND TURBULENT SWIRLING JET IMPINGEMENT HEAT TRANSFER FROM A HOT SURFACE

Muhammad Ali Rob Sharif
Aerospace Engineering and Mechanics Department, The University of Alabama, Tuscaloosa, Alabama, USA

ABSTRACT

Numerical investigation of heat transfer from a heated plane circular surface due to round turbulent submerged swirling jet impingement is conducted in this study. A round swirling turbulent jet is impinging normally on a concentric circular hot plane surface. The axisymmetric flow domain is bounded by the hot impingement surface and the jet exit plane. The flow is characterized by the jet exit Reynolds number (Re), the jet exit swirl number (Sw) representing the swirl strength of the inlet flow, and the nondimensional distance of separation from the jet exit to the impingement plate (H). The commercial CFD code ANSYS Fluent along with the transition SST k-ω turbulence model is used for the computations. In order to select a suitable turbulence model for the computations, the performance of a few turbulence models in the computation of round impinging jet heat transfer were validated against experimental data, and the transition SST k-ω model was selected. Computations are performed for many arrangements of the above-mentioned parameters and critical analysis of the heat transfer process is performed. The results indicate negative effect on heat transfer when swirl is present. For low- to mid-range swirl strength when Sw ≤ 0.77, the average Nusselt number drops mildly as Sw is increased from 0 (nonswirling case). When Sw ≥ 1, the average Nusselt number increases mildly with increasing Sw but remains less than that for the nonswirling case. Also when Sw ≤ 0.77, the average Nusselt number increases mildly with increasing jet-to-target separation distance (2 ≤ H ≤ 10). On the other hand, when Sw ≥ 1.00, the average Nusselt number moderately drops as H increases.


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