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Atomization and Sprays
Facteur d'impact: 1.189 Facteur d'impact sur 5 ans: 1.596 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2013008080
pages 819-840

IMPINGEMENT FLUX UNIFORMITY IN NOZZLE SPRAYING FOR INDUSTRIAL APPLICATIONS

Ampere A. Tseng
Heat Transfer and Fluid Flow Laboratory, Brno University of Technology, 616 69 Brno, Czech Republic; School for Engineering of Matter, Transport and Energy, 501 E. Tyler Mall, ECG301, Arizona State University, Tempe, Arizona 85287, USA
Miroslav Raudensky
Heat Transfer and Fluid Flow Laboratory, Brno University of Technology, Technicka 2896/2, 616 69 Brno, Czech Republic
Bo Li
School for Engineering of Matter, Transport and Energy, 501 E. Tyler Mall, ECG301, Arizona State University, Tempe, Arizona 85287, USA

RÉSUMÉ

The spray volume flux on the impingement or target surface from a nozzle is inherently not uniform even with a short impingement distance. A technique that only requires a special one-dimensional (1D) array arrangement of spray nozzles is developed to provide a uniform overall flux on a large impingement surface with the existing commercially available nozzles. Experiments and analyses were first conducted to assess how well the measured spray flux profiles can be correlated or fitted to a Gaussian function. The corresponding coefficient of determinations (R2) and standard deviations were specifically computed to quantify the deviation of the correlations or the data fitting accuracy. It was found that the measured spray flux data agreed extremely well with the Gaussian function. Based on this finding, the technique to assemble the overall flux profile from the 1D arrayed nozzles was analytically developed and experimentally illustrated. By adjusting the array pitch or nozzle spacing, the profile of the overall (overlapped) spray volume flux could be controlled and predicted. The uniformity criteria for assembling a uniform overall flux profile, including the threshold pitch, uniformity ratio, and flux peak intensity, were then analyzed and experimentally confirmed.


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