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Atomization and Sprays
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ISSN Print: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2013007728
pages 799-817

A PARAMETRIC STUDY OF A FLASH ATOMIZED WATER JET USING A PHASE DOPPLER PARTICLE ANALYZER

Kevin Breton
Department of Mechanical Engineering, University of Alberta, Alberta, T6G-2R3, Canada
Brian A. Fleck
Mechanical Engineering Department, University of Alberta, 4-9 Mechanical Engineering Building, Edmonton, AB, T6G 2G8, Canada
David S. Nobes
University of Alberta, Department of Mechanical Engineering, Edmonton, T6G 2G8, Alberta, Canada

ABSTRACT

This study used non-intrusive, optical-based measurement techniques in a parametric study of a flash atomized jet. The bench scale water spray was operated at pressure ratios ranging from 6.80 to 17.0 and degrees of superheat of 20-80° C. The nozzle used was an axisymmetric, converging-diverging design with a throat diameter of 0.8 mm. This broad range of parameters allowed for the evaluation of the influence of the operating conditions on the spray characteristics. Long exposure images were used in order to measure the spreading angle of the flashing jet which varied from 10 to 50°, while phase Doppler Particle analyzer measurements were used in order to measure the radial profiles of the droplet velocities and diameters. The spray produced consistent droplet mean diameters of approximately 3µm and centerline velocities from 25 to 35 m/s. The results indicate that the characteristics of a flashing spray operating at high degrees of superheat are robust with respect to changes in the operating pressure ratio.


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