Improved atomization via a mechanical atomizer with optimal geometric parameters and an air-assisted component

Inna Levitsky, Dorith Tavor

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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-effciency 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.

Original languageEnglish
Article number584
Pages (from-to)1-15
Number of pages15
JournalMicromachines
Volume11
Issue number6
DOIs
StatePublished - 1 Jun 2020
Externally publishedYes

Keywords

  • Air-assisted atomizer
  • Air/Liquid mass flow ratio
  • Drop diameters
  • Mechanical atomizer
  • Swirl chamber

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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