Temporal Instability of a Power-Law Planar Liquid Sheet

2015 ◽  
Vol 31 (1) ◽  
pp. 286-293 ◽  
Author(s):  
Li-jun Yang ◽  
Ming-long Du ◽  
Qing-fei Fu ◽  
Ming-xi Tong ◽  
Chen Wang
Keyword(s):  
Power Law ◽  
Liquid Sheet ◽  
Temporal Instability

DUAL-MODE LINEAR ANALYSIS OF TEMPORAL INSTABILITY FOR POWER-LAW LIQUID SHEET

2016 ◽  
Vol 26 (4) ◽  
pp. 319-347 ◽  
Author(s):  
Han-Yu Deng ◽  
Feng Feng ◽  
Xiao-Song Wu
Keyword(s):  
Power Law ◽  
Linear Analysis ◽  
Liquid Sheet ◽  
Dual Mode ◽  
Temporal Instability

Breakup of a power-law liquid sheet formed by an impinging jet injector

2012 ◽  
Vol 39 ◽  
pp. 37-44 ◽  
Author(s):  
Li-jun Yang ◽  
Qing-fei Fu ◽  
Yuan-yuan Qu ◽  
Bin Gu ◽  
Meng-zheng Zhang
Keyword(s):  
Power Law ◽  
Impinging Jet ◽  
Liquid Sheet

Temporal Instability for a Charged Power-Law Liquid Jet in a Coaxial Swirling Air

AIAA Journal ◽  
2018 ◽  
Vol 56 (9) ◽  
pp. 3515-3523 ◽  
Author(s):  
Xin-Tao Wang ◽  
Zhi Ning ◽  
Ming Lü
Keyword(s):  
Power Law ◽  
Liquid Jet ◽  
Temporal Instability

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.

Study on some Aspects of Breakup Characteristics of Power-Law Fluid with Impinging Jets Based on Mechanics Properties

2012 ◽  
Vol 625 ◽  
pp. 57-60
Author(s):  
En Dong Wang ◽  
Yan Yin ◽  
Qing Du
Keyword(s):  
Power Law ◽  
High Speed ◽  
Wave Length ◽  
Impinging Jets ◽  
Liquid Sheet ◽  
Liquid Jets ◽  
Power Law Fluid ◽  
Round Jets ◽  
Breakup Length ◽  
Jet Velocity

Shear-thinning power-law fluid is a kind of non-Newtonian fluid in which the viscosity is a function of shear rate. Impinging jets system is used to study the breakup characteristics of power-law liquid sheets formed by two symmetrical round jets in this study. High quality images are obtained from the experiment with a high speed camera and breakup length is extracted from the images. Closed-rim sheet, web-like sheet and ligaments sheet are observed with the increase of jet velocity. A series of images show that the wave length on the surface of sheets tends to decline as the jet velocity increases. At a low We number, the breakup length increases with an increasing We number. However, it first increases and then decreases when the liquid sheet breaks up at a high We number. The liquid jets with larger diameter collide to each other and lead to a liquid sheet with a smaller breakup length.

Spray Characteristics of Elliptical Power-Law Fluid-Impinging Jets

2017 ◽  
Vol 139 (7) ◽  
Author(s):  
Fei Zhao ◽  
Li-Zi Qin ◽  
Qing-Fei Fu ◽  
Chao-Jie Mo ◽  
Li-Jun Yang
Keyword(s):  
Power Law ◽  
Impinging Jets ◽  
Liquid Sheet ◽  
Rheological Parameters ◽  
Power Law Fluid ◽  
Spray Characteristics ◽  
Theoretical Predictions ◽  
Fluid Jets ◽  
Atomization Efficiency ◽  
Improved Model

The spray characteristics of a liquid sheet contribute much to the investigation of atomization efficiency. Considering the jet contracting effect of elliptical jets, an improved model of elliptical power-law fluid jets is proposed herein to derive the spray characteristics. Some experiments have been conducted to verify its feasibility, and the results show a good agreement with theoretical predictions. The effect of the aspect ratio on sheet shape and thickness has been studied to interpret the phenomenon that liquid sheets formed by the impinging elliptical jets are more likely to disintegrate. The relationships between rheological parameters (K and n) and the spray features are also discussed.

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