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

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          Abstract

          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 D 32 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, D 32 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.

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                Author and article information

                Journal
                Micromachines (Basel)
                Micromachines (Basel)
                micromachines
                Micromachines
                MDPI
                2072-666X
                11 June 2020
                June 2020
                : 11
                : 6
                Affiliations
                [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
                Author notes
                [* ]Correspondence: levii2@ 123456sce.ac.il (I.L.); dtavor@ 123456sce.ac.il (D.T.)
                Article
                micromachines-11-00584
                10.3390/mi11060584
                7345477
                32545273
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

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