Experiments on annular liquid jet instability and on the formation of liquid shells

1986 ◽  
Vol 29 (7) ◽  
pp. 2086 ◽  
Author(s):  
James M. Kendall
Keyword(s):  
Liquid Jet ◽  
Jet Instability ◽  
Annular Liquid Jet

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

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

scholarly journals Study of liquid jet instability by confocal microscopy

2012 ◽  
Vol 83 (7) ◽  
pp. 073104 ◽  
Author(s):  
Lisong Yang ◽  
Leanne J. Adamson ◽  
Colin D. Bain
Keyword(s):  
Confocal Microscopy ◽  
Liquid Jet ◽  
Jet Instability

scholarly journals Thermal Effect on the Instability of Annular Liquid Jet

Aerospace ◽  
2021 ◽  
Vol 8 (12) ◽  
pp. 382
Author(s):  
Xiao Cui ◽  
Boqi Jia
Keyword(s):  
Reynolds Number ◽  
Temperature Gradient ◽  
Thermal Effect ◽  
Weber Number ◽  
Marangoni Effect ◽  
Critical Value ◽  
Liquid Jet ◽  
Radial Temperature Gradient ◽  
Radial Temperature ◽  
Annular Liquid Jet

The linear instability of an annular liquid jet with a radial temperature gradient in an inviscid gas steam is investigated theoretically. A physical model of an annular liquid jet with a radial temperature gradient is established, dimensionless governing equations and boundary conditions are given, and numerical solutions are obtained using the spectral collocation method. The correctness of the results is verified to a certain extent. The liquid surface tension coefficient is assumed to be a linear function of temperature. The effects of various dimensionless parameters (including the Marangoni number/Prandtl number, Reynolds number, temperature gradient, Weber number, gas-to-liquid density ratio and velocity ratio) on the instability of the annular liquid jet are discussed. A decreasing Weber number destabilizes the annular liquid jet when the Weber number is lower than a critical value. It is found that the effects of the Marangoni effect are related to the Weber number. The Marangoni effect enhances instability when the Weber number is small, while the Marangoni effect weakens instability when the Weber number is large. In addition, because the thermal effect is considered, a decreasing Reynolds number enhances the instability when the Weber number is lower than a critical value, which is similar to the results of a viscous liquid sheet with a temperature difference between two planar surfaces. Furthermore, the effects of other dimensionless parameters are also investigated.

Liquid Jet Instability and Atomization in a Coaxial Gas Stream

2000 ◽  
Vol 32 (1) ◽  
pp. 275-308 ◽  
Author(s):  
J. C. Lasheras ◽  
E. J. Hopfinger
Keyword(s):  
Liquid Jet ◽  
Jet Instability
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