Droplet de-entrainment by inertial impaction on vertical rods in an air-droplet mixture flow

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We experimentally investigate the de-entrainment of droplets by inertial impaction on an array of vertical rods in an air-droplet mixture flow. The de-entrainment efficiencies are measured for a single rod, for a single row of rods, and for a multi-row of rods. We investigate the effects of the droplet mass flux (0.5-5.4kg/m(2) s), the droplet Weber number (3000-8000), the air velocity (0-6 m/s), the rod geometry, and the surface roughness on the de-entrainment, and the rod diameter-to-pitch ratio effect on the de-entrainment. The results for a single rod show that the de-entrainment efficiency decreases slightly as the droplet mass flux increases; however, in our experimental ranges, there is negligible dependence on the droplet Weber number, the air velocity, and the surface roughness. The rod geometry affects the de-entrainment efficiency. The results for a single row of rods show that the existence of neighboring rods promotes de-entrainment due to droplet splashing, and we develop a correlation to show the effect of diameter-to-pitch ratio on the de-entrainment. Using information on the de-entrainment efficiencies of a single rod and those of a single row of rods, we propose a correlation that predicts the de-entrainment efficiency for a multirow of rods with a staggered array. The RMS errors of the correlation from the de-entrainment efficiencies experimentally obtained are within 13.5%. (c) 2005 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2006-05
Language
English
Article Type
Article
Citation

NUCLEAR ENGINEERING AND DESIGN, v.236, no.9, pp.1003 - 1012

ISSN
0029-5493
DOI
10.1016/j.nucengdes.2005.10.001
URI
http://hdl.handle.net/10203/92565
Appears in Collection
NE-Journal Papers(저널논문)
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