Spatial instability of a viscous liquid sheet

1995 ◽  
Vol 11 (1) ◽  
pp. 146-152 ◽  
Author(s):  
E. A. Ibrahim
Keyword(s):  
Viscous Liquid ◽  
Liquid Sheet ◽  
Spatial Instability

Spatial instability in annular swirling viscous liquid sheet

2015 ◽  
Vol 27 (2) ◽  
pp. 024101 ◽  
Author(s):  
Kai Yan ◽  
Zhi Ning ◽  
Ming Lü ◽  
Chunhua Sun ◽  
Juan Fu ◽  
...  
Keyword(s):  
Viscous Liquid ◽  
Liquid Sheet ◽  
Spatial Instability

Nonlinear spatial instability of an annular swirling viscous liquid sheet

2013 ◽  
Vol 224 (12) ◽  
pp. 3071-3090 ◽  
Author(s):  
Kai Yan ◽  
Milind A. Jog ◽  
Zhi Ning
Keyword(s):  
Viscous Liquid ◽  
Liquid Sheet ◽  
Spatial Instability

Linear Instability Analysis of an Annular Swirling Viscous Liquid Jet

2011 ◽  
Vol 66-68 ◽  
pp. 1556-1561 ◽  
Author(s):  
Kai Yan ◽  
Ming Lv ◽  
Zhi Ning ◽  
Yun Chao Song
Keyword(s):  
Viscous Liquid ◽  
Liquid Velocity ◽  
Aerodynamic Force ◽  
Numerical Procedure ◽  
Liquid Sheet ◽  
Linear Instability ◽  
Viscous Force ◽  
Liquid Jet ◽  
Instability Analysis ◽  
Linear Instability Analysis

A three-dimensional linear instability analysis was carried out for an annular swirling viscous liquid jet with solid vortex swirl velocity profile. An analytical form of dispersion relation was derived and then solved by a direct numerical procedure. A parametric study was performed to explore the instability mechanisms that affect the maximum spatial growth rate. It is observed that the liquid swirl enhances the breakup of liquid sheet. The surface tension stabilizes the jet in the low velocity regime. The aerodynamic force intensifies the developing of disturbance and makes the jet unstable. Liquid viscous force holds back the growing of disturbance and the makes the jet stable, especially in high liquid velocity regime.

On the temporal instability of a two-dimensional viscous liquid sheet

1991 ◽  
Vol 226 ◽  
pp. 425-443 ◽  
Author(s):  
Xianguo Li ◽  
R. S. Tankin
Keyword(s):  
Growth Rate ◽  
Viscous Liquid ◽  
Local Maximum ◽  
Liquid Sheet ◽  
Rate Curve ◽  
Liquid Viscosity ◽  
Number Range ◽  
Liquid Sheets ◽  
Temporal Instability ◽  
Aerodynamic Instability

This paper reports a temporal instability analysis of a moving thin viscous liquid sheet in an inviscid gas medium. The results show that surface tension always opposes, while surrounding gas and relative velocity between the sheet and gas favour, the onset and development of instability. It is found that there exist two modes of instability for viscous liquid sheets – aerodynamic and viscosity-enhanced instability – in contrast to inviscid liquid sheets for which the only mode of instability is aerodynamic. It is also found that axisymmetrical disturbances control the instability process for small Weber numbers, while antisymmetrical disturbances dominate for large Weber numbers. For antisymmetrical disturbances, liquid viscosity, through the Ohnesorge number, enhances instability at small Weber numbers, while liquid viscosity reduces the growth rate and the dominant wavenumber at large Weber numbers. At the intermediate Weber-number range, Liquid viscosity has complicated effects due to the interaction of viscosity-enhanced and aerodynamic instabilities. In this range, the growth rate curve exhibits two local maxima, one corresponding to aerodynamic instability, for which liquid viscosity has a negligible effect, and the other due to viscosity-enhanced instability, which is influenced by the presence and variation of liquid viscosity. For axisymmetrical disturbances, liquid viscosity always reduces the growth rate and the dominant wavenumber, aerodynamic instability always prevails, and although the regime of viscosity-enhanced instability is always present, its growth rate curve does not possess a local maximum.

Modal decomposition analysis of unsteady viscous liquid sheet flows

2021 ◽  
Vol 33 (9) ◽  
pp. 092117
Author(s):  
Antonio Colanera ◽  
Alessandro Della Pia ◽  
Matteo Chiatto ◽  
Luigi de Luca ◽  
Francesco Grasso
Keyword(s):  
Viscous Liquid ◽  
Decomposition Analysis ◽  
Liquid Sheet ◽  
Modal Decomposition

Linear spatial instability of viscous flow of a liquid sheet through gas

2010 ◽  
Vol 22 (7) ◽  
pp. 074103 ◽  
Author(s):  
M. Altimira ◽  
A. Rivas ◽  
J. C. Ramos ◽  
R. Anton
Keyword(s):  
Viscous Flow ◽  
Liquid Sheet ◽  
Spatial Instability
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