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Open AccessArticle

Improved Atomization via a Mechanical Atomizer with Optimal Geometric Parameters and an Air-Assisted Component

by Inna Levitsky 1,* and Dorith Tavor 1,2,*
1
Department of Chemical Engineering, Shamoon College of Engineering, PO Box 950, Beer-Sheva 84100, Israel
2
Green Processes Center, Shamoon College of Engineering, PO Box 950, Beer-Sheva 84100, Israel
*
Authors to whom correspondence should be addressed.
Micromachines 2020, 11(6), 584; https://doi.org/10.3390/mi11060584
Received: 11 May 2020 / Revised: 7 June 2020 / Accepted: 8 June 2020 / Published: 11 June 2020
(This article belongs to the Special Issue Miniaturized Generators)
Atomization of liquid media is a key aim in various technological disciplines, and solutions that improve spray performance, while decreasing energy consumption, are in great demand. That concept is very important in the development of liquid fuel spray atomizers in high-efficiency microturbines and other generator systems with low inlet pressure and a wide range of power supply. Here we present a study of the liquid atomization characteristics for a new mechanical atomizer that has optimal geometric parameters and a preliminary swirl stage. In our air-assisted atomizer, air is introduced through a swirl chamber positioned at the exit of the mechanical atomizer. The optimized mechanical atomizer alone can achieve D32 drop diameters in the range of 80 to 40 µm at water supply pressures of 2 to 5 bar, respectively. The addition of an air swirl chamber substantially decreases drop sizes. At an air–liquid ratio (ALR) equal to 1, water pressures of 2.5 to 3 bar and air supply pressures 0.35 to 1 bar, D32 drops with diameters of 20–30 µm were obtained. In an air-assisted atomizer the parameters of the mechanical atomizer have a much stronger influence on drop diameters than do characteristics of the air-swirl chamber. Using a mechanical atomizer with optimal geometrical dimensions allows limiting the liquid supply pressure to 5 bar; but when an air-assisted component is introduced we can recommend an ALR ≈ 1 and an air supply pressure of up to 1 bar. View Full-Text
Keywords: mechanical atomizer; air-assisted atomizer; swirl chamber; drop diameters; air/liquid mass flow ratio mechanical atomizer; air-assisted atomizer; swirl chamber; drop diameters; air/liquid mass flow ratio
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Levitsky, I.; Tavor, D. Improved Atomization via a Mechanical Atomizer with Optimal Geometric Parameters and an Air-Assisted Component. Micromachines 2020, 11, 584.

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