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Atomization and Sprays
Fator do impacto: 1.262 FI de cinco anos: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v16.i1.60
pages 83-102

CONE-JET AND MULTIJET ELECTROSPRAYS: TRANSPORT AND EVAPORATION

O. Wilhelm
Particle Technology Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, ML F25, CH- 8092 Zurich, Switzerland
L. Madler
Particle Technology Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, Sonneggstrasse 3, ML F25, CH- 8092 Zurich, Switzerland

RESUMO

A numerical model for droplet transport and evaporation of electrosprays in a capillary-plate configuration is compared to droplet size and velocity measurements. Two distinct electrospray modes are investigated: the cone-jet mode with a narrow droplet size distribution and a spraying angle smaller than 45 deg, and the intermittent multijet with a broad size distribution and a spraying angle of approximately 180 deg at the capillary exit. LiCl/isopropanol solutions are deposited on a heated plate. The temperature of the plate is adjusted between 20 and 215°C. The spray droplet transport and evaporation is examined with a phase doppler anemometer (PDA), which is able to track the velocity and size of droplets in the spray. The measurements are compared to the model predictions. For the first time, combined droplet transport and evaporation in the intermittent multijet electrosprays is calculated. Cone-jet and intermittent multijet calculations are in quantitative agreement with the measurements. The applicability of the different spraying modes to thin-film deposition and particle production is discussed with reference to electrospray transport and evaporation behavior.


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