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TECHNICAL PAPERS

A Functional Correlation for the Primary Breakup Processes of Liquid Sheets Emerging From Air-Assist Atomizers

[+] Author and Article Information
V. Sivadas1

Laboratory of Thermofluids, Combustion and Energy Systems, Center for Innovation, Technology and Policy Research, IN+ , Instituto Superior Técnico, Technical University of Lisbon, Avenue Rovisco Pais, 1049-001 Lisbon, Portugalvsdas@ntu.edu.sg

M. V. Heitor, Rui Fernandes

Laboratory of Thermofluids, Combustion and Energy Systems, Center for Innovation, Technology and Policy Research, IN+ , Instituto Superior Técnico, Technical University of Lisbon, Avenue Rovisco Pais, 1049-001 Lisbon, Portugal

1

Current address: Research Staff, Singapore Stanford Partnership, School of Civil & Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore.

J. Fluids Eng 129(2), 188-193 (Aug 29, 2006) (6 pages) doi:10.1115/1.2429701 History: Received September 21, 2004; Revised August 29, 2006

The study aims to highlight a general relationship between the characteristic variables of liquid sheet breakup and the principal forces of the flow domain. To accomplish this objective, an experimental investigation on air-assisted liquid sheets was carried out for a range of liquid-to-air velocities. The associated spray angle, breakup frequency, and breakup length were measured by exploiting high-speed imaging techniques. The results demonstrate that, when the stability variables are related to the liquid–air momentum flux ratio, a high correlation was attained for a range of flow conditions where capillary instability is insignificant.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 10

Nondimensional breakup length as a function of the ratio of inertial to aerodynamic forces

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Figure 9

Breakup length as a function of liquid and air velocities

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Figure 8

Comparison of measured breakup frequency with theory (Ua=20m∕s)

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Figure 7

Nondimensional breakup frequency as a function of the ratio of inertial to aerodynamic forces

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Figure 6

Breakup frequency as a function of liquid and air velocities

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Figure 5

Spray angle as a function of the ratio of inertial to aerodynamic forces

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Figure 4

Spray angle as a function of liquid and air velocities

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Figure 3

Side-view images of liquid sheet disintegration for different impingement angles (Qa=3g∕s)

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Figure 2

Front-view images of liquid sheet for different impingement angles (Ql=9.1g∕s)

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Figure 1

Schematic diagram of liquid sheet generator

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