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Journal of Enhanced Heat Transfer
Facteur d'impact: 0.562 Facteur d'impact sur 5 ans: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2012002414
pages 135-147

NUMERICAL INVESTIGATION OF THE CO-AXIAL IMPINGING JETS WITH VARIOUS DIAMETER RATIOS

Nevin Celik
Firat university
Daniel W. Bettenhausen
University of Minnesota, Department of Mechanical Engineering, Minneapolis, Minnesota 55455, USA

RÉSUMÉ

A predictive theory is presented which is capable of providing quantitative results for the heat transfer in impinging co-axial jets for the turbulent flow regime. The numerical solution is performed by making use of the CFX software package which discretizes the solution domain into quadrilateral elements. The heat transfer is calculated with the Nusselt number. The geometric variable parameter is the diameter ratio d/D (ratio of inner diameters of the inner and outer pipes). Other dependent parameters are dimensionless jet-to-impingement plate distance (H/D), Reynolds number (Re), and dimensionless radial distance (r/D). Local, average, and stagnation-point Nusselt numbers were found as the results of heat transfer analysis. It was found that local, average, and stagnation-point heat transfer with d/D attained a maximum at d/D = 0.55. For d/D = 0.55 and 0.35, for a given Reynolds number (10,000,20,000, and 50,000), a co-axial jet yields higher heat transfer coefficients than a single jet.


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