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Atomization and Sprays
IF: 1.737 5-Year IF: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 2.2

ISSN Print: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v18.i7.10
pages 571-617

NUMERICAL INVESTIGATION ON THE DISINTEGRATION OF ROUND TURBULENT LIQUID JETS USING LES/VOF TECHNIQUES

Vedanth Srinivasan
Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506, USA
Abraham J. Salazar
Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506, USA
Kozo Saito
Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506, USA

ABSTRACT

Disintegration of round turbulent liquid jets issuing from a coaxial-type atomizer into a high-pressure chamber is numerically studied using a coupled large eddy simulation (LES)/volume of fluid (VOF) technique. The investigations are directed toward assessing the influence of relative velocity between the liquid and gas streams on the disintegration characteristics. For this purpose, different combinations of liquid and gas injection velocities have been discussed. With higher relative velocities, the computations reveal development of short-wave shear instabilities, leading to ligament and drop formation. However, with a decrease in relative velocity, reduced breakup events are established. Mechanisms such as interface stretching, velocity profile relaxation, and shear layer effects are captured effectively and are used to explain the ligament characteristics under different injection conditions. Prediction of jet spread angle and undisturbed jet length based on the numerical modeling show good agreement with the experimental observations. The overall capability of a coupled LES/VOF technique to simulate disintegration of round turbulent liquid jets is demonstrated.


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