Experimental Study of Sprays from Annular Liquid Jet Breakup

1999 ◽  
Vol 15 (1) ◽  
pp. 103-110 ◽  
Author(s):  
Xianguo Li ◽  
Jihua Shen
Keyword(s):  
Experimental Study ◽  
Liquid Jet ◽  
Jet Breakup ◽  
Annular Liquid Jet

Experimental Study on Factors of Jet Breakup for Uniform Droplet Stream

2011 ◽  
Vol 101-102 ◽  
pp. 1027-1030
Author(s):  
Sheng Dong Gao ◽  
Yang Wang ◽  
Yan Wu ◽  
Zhi Wei Liu
Keyword(s):  
Experimental Study ◽  
Metal Droplet ◽  
Liquid Jet ◽  
Jet Breakup ◽  
Droplet Stream ◽  
Set Up ◽  
Uniform Droplets ◽  
Relationship Of ◽  
The Relationship ◽  
Uniform Droplet

In this study an experimental device capable of producing uniform metal droplet stream with image gathering was set up. A periodic vibration was applied to a compound liquid jet for an experimental study on its breakup. The breakup processes of the compound jet were discussed from the image taken from the experiment. The aim is to study the relationship of the factors which determine the jet breakup into a series of uniform droplets.

DETECTION OF AERODYNAMIC EFFECTS IN LIQUID JET BREAKUP AND DROPLET FORMATION

1999 ◽  
Vol 9 (4) ◽  
pp. 331-342 ◽  
Author(s):  
Michael P. Moses ◽  
Steven H. Collicott ◽  
Stephen D. Heister
Keyword(s):  
Droplet Formation ◽  
Liquid Jet ◽  
Jet Breakup

Simulation of Laminar Liquid Jets in Gaseous Crossflow Before the Onset of Primary Breakup

2011 ◽  
Author(s):  
C.-L. Ng ◽  
K. A. Sallam
Keyword(s):  
Experimental Data ◽  
Fuel Injection ◽  
Liquid Jets ◽  
Liquid Jet ◽  
Jet Breakup ◽  
Primary Breakup ◽  
Density Ratios ◽  
First Time ◽  
Two Sides ◽  
Reduced Pressures

The deformation of laminar liquid jets in gaseous crossflow before the onset of primary breakup is studied motivated by its application to fuel injection in jet afterburners and agricultural sprays, among others. Three crossflow Weber numbers that represent three different liquid jet breakup regimes; column, bag, and shear breakup regimes, were studied at large liquid/gas density ratios and small Ohnesorge numbers. In each case the liquid jet was simulated from the jet exit and ended before the location where the experimental data indicated the onset of breakup. The results show that in column and bag breakup, the reduced pressures along the sides of the jet cause the liquid to move to the sides of the jet and enhance the jet deformation. In shear breakup, the flattened upwind surface pushes the liquid towards the two sides of the jet and causing the gaseous crossflow to separate near the edges of the liquid jet thus preventing further deformation before the onset of breakup. It was also found out that in shear breakup regime, the liquid phase velocity inside the liquid jet was large enough to cause onset of ligament formation along the jet side, which was not the case in the column and bag breakup regimes. In bag breakup, downwind surface waves were observed to grow along the sides of the liquid jet triggered a complimentary experimental study that confirmed the existence of those waves for the first time.

scholarly journals Stability of a Viscous Liquid Jet in a Coaxial Twisting Compressible Airflow

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 918
Author(s):  
Li-Mei Guo ◽  
Ming Lü ◽  
Zhi Ning
Keyword(s):  
Viscous Liquid ◽  
Axial Velocity ◽  
Liquid Velocity ◽  
Velocity Ratio ◽  
Dominant Mode ◽  
Liquid Jet ◽  
Axisymmetric Mode ◽  
Jet Instability ◽  
Jet Stability ◽  
Jet Breakup

Based on the linear stability analysis, a mathematical model for the stability of a viscous liquid jet in a coaxial twisting compressible airflow has been developed. It takes into account the twist and compressibility of the surrounding airflow, the viscosity of the liquid jet, and the cavitation bubbles within the liquid jet. Then, the effects of aerodynamics caused by the gas–liquid velocity difference on the jet stability are analyzed. The results show that under the airflow ejecting effect, the jet instability decreases first and then increases with the increase of the airflow axial velocity. When the gas–liquid velocity ratio A = 1, the jet is the most stable. When the gas–liquid velocity ratio A > 2, this is meaningful for the jet breakup compared with A = 0 (no air axial velocity). When the surrounding airflow swirls, the airflow rotation strength E will change the jet dominant mode. E has a stabilizing effect on the liquid jet under the axisymmetric mode, while E is conducive to jet instability under the asymmetry mode. The maximum disturbance growth rate of the liquid jet also decreases first and then increases with the increase of E. The liquid jet is the most stable when E = 0.65, and the jet starts to become more easier to breakup when E = 0.8425 compared with E = 0 (no swirling air). When the surrounding airflow twists (air moves in both axial and circumferential directions), given the axial velocity to change the circumferential velocity of the surrounding airflow, it is not conducive to the jet breakup, regardless of the axisymmetric disturbance or asymmetry disturbance.

Linear instability of an annular liquid jet with gas velocity oscillations

2021 ◽  
Vol 33 (5) ◽  
pp. 054110
Author(s):  
Xin-yan Guan ◽  
Bo-qi Jia ◽  
Li-jun Yang ◽  
Qing-fei Fu
Keyword(s):  
Linear Instability ◽  
Liquid Jet ◽  
Gas Velocity ◽  
Annular Liquid Jet

scholarly journals Effects of Asymmetric Gas Distribution on the Instability of a Plane Power-Law Liquid Jet

Energies ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1854 ◽  
Author(s):  
Jin-Peng Guo ◽  
Yi-Bo Wang ◽  
Fu-Qiang Bai ◽  
Fan Zhang ◽  
Qing Du
Keyword(s):  
Power Law ◽  
Liquid Velocity ◽  
Linear Instability ◽  
Liquid Jets ◽  
Liquid Jet ◽  
Critical Curves ◽  
Jet Breakup ◽  
Plane Jets ◽  
Gas Space ◽  
Aerodynamic Asymmetry

As a kind of non-Newtonian fluid with special rheological features, the study of the breakup of power-law liquid jets has drawn more interest due to its extensive engineering applications. This paper investigated the effect of gas media confinement and asymmetry on the instability of power-law plane jets by linear instability analysis. The gas asymmetric conditions mainly result from unequal gas media thickness and aerodynamic forces on both sides of a liquid jet. The results show a limited gas space will strengthen the interaction between gas and liquid and destabilize the power-law liquid jet. Power-law fluid is easier to disintegrate into droplets in asymmetric gas medium than that in the symmetric case. The aerodynamic asymmetry destabilizes para-sinuous mode, whereas stabilizes para-varicose mode. For a large Weber number, the aerodynamic asymmetry plays a more significant role on jet instability compared with boundary asymmetry. The para-sinuous mode is always responsible for the jet breakup in the asymmetric gas media. With a larger gas density or higher liquid velocity, the aerodynamic asymmetry could dramatically promote liquid disintegration. Finally, the influence of two asymmetry distributions on the unstable range was analyzed and the critical curves were obtained to distinguish unstable regimes and stable regimes.

Simulation of an annular liquid jet with a coaxial supersonic gas jet in a medical inhaler

2021 ◽  
Author(s):  
Yanchao Liu ◽  
Anne Geppert ◽  
Chu Xu ◽  
Benjamin Heine ◽  
Bernhard Weigand
Keyword(s):  
Gas Jet ◽  
Liquid Jet ◽  
Supersonic Gas Jet ◽  
Annular Liquid Jet
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