Impact of the jet velocity on the turbulent liquid jet

Document Type : Original Article

Authors

1 Mechanical Power Engineering Department, Faculty of Engineering at Elmataria, Helwan University, Cario, Egypt

2 Mechanical Power Engineering Department, Faculty of Engineering at Elmataria, Helwan University, Cario, Egypt.

Abstract

This numerical study aims to investigate the impact of jet velocity and nozzle diameter on liquid 
turbulent jet. Incompressible large eddy simulations (LES) with Wall-Adapting Local EddyViscosity (WALE) sub-grid scale model in ANSYS-FLUENT were performed to capture the 
morphology of the breakup as well as the important flow field characteristics. A volume of fluid 
(VOF) approach was used to track the unsteady evolution and breakup of the liquid jet. Different 
results have been analyzed to assess this impact. These results are instantaneous and timeaveraged axial velocity, liquid volume fraction, and turbulent kinetic energy. The results are 
represented in contours and centerline- and radial-profiles. The surrounding gas density is 34.5 
kg/m3
. The nozzle exit diameter is 0.05 mm. Three jet exit-velocities of 50 m/s, 100 m/s and 150 
m/s are considered. The results showed that the predicted location, where drops and ligaments 
are first seen, moves away from the nozzle as the jet velocity increases, where this location was 
computed as 𝑥 = 3.5𝐷, 6.5𝐷 and 7.5𝐷 for Case50, Case100 and Case150, respectively. Also, 
the predicted location, where surface waves developed from Kelvin-Helmholtz instability are 
first seen, moves towards the nozzle as the jet velocity increases, where this location was 
computed as 𝑥 = 1.6𝐷, 1𝐷 𝑎𝑛𝑑 0.5𝐷 for Case50, Case100 and Case150, respectively. Regarding 
the jet dispersion angle and the liquid core length, it was found that they increase with increasing 
the jet exit velocity. 

Keywords

Engineering Research Journal
Volume 179, Issue 0
September 2023
Pages 249-273

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