Characterization of plunging liquid jets: A combined experimental and numerical investigation

2011 ◽  
Vol 37 (7) ◽  
pp. 722-731 ◽  
Author(s):  
X.L. Qu ◽  
L. Khezzar ◽  
D. Danciu ◽  
M. Labois ◽  
D. Lakehal
Keyword(s):  
Numerical Investigation ◽  
Liquid Jets

NUMERICAL INVESTIGATION ON THE DISINTEGRATION OF ROUND TURBULENT LIQUID JETS USING LES/VOF TECHNIQUES

2008 ◽  
Vol 18 (7) ◽  
pp. 571-617 ◽  
Author(s):  
Vedanth Srinivasan ◽  
Abraham J. Salazar ◽  
Kozo Saito
Keyword(s):  
Numerical Investigation ◽  
Liquid Jets

DETAILED NUMERICAL INVESTIGATION OF TURBULENT ATOMIZATION OF LIQUID JETS

2010 ◽  
Vol 20 (4) ◽  
pp. 311-336 ◽  
Author(s):  
H. Pitsch ◽  
Olivier Desjardins
Keyword(s):  
Numerical Investigation ◽  
Liquid Jets

Experimental Characterization of Intrinsic Properties Associated With Air-Assisted Liquid Jet and Liquid Sheet

2018 ◽  
Vol 140 (5) ◽  
Author(s):  
K. Balaji ◽  
V. Sivadas ◽  
Vishnu Radhakrishna ◽  
Khushal Ashok Bhatija ◽  
K. Sai Charan
Keyword(s):  
High Speed ◽  
Liquid Sheet ◽  
Interfacial Instability ◽  
Wave Number ◽  
Liquid Jets ◽  
Liquid Jet ◽  
Experimental Characterization ◽  
Interfacial Wave ◽  
Visualization Techniques

The present study focuses on experimental characterization of interfacial instability pertinent to liquid jet and liquid sheet in the first wind-induced zone. To accomplish this objective, the interfacial wave growth rate, critical wave number, and breakup frequency associated with air-assisted atomizer systems were extracted by utilizing high-speed flow visualization techniques. For a range of liquid to gas velocities tested, nondimensionalization with appropriate variables generates the corresponding correlation functions. These functions enable to make an effective comparison between interfacial wave developments for liquid jet and sheet configurations. It exhibits liquid sheets superiority over liquid jets in the breakup processes leading to efficient atomization.

Experimental Characterization of the Whipping Instability of Charged Microjets in Liquid Baths

2010 ◽  
Vol 1272 ◽  
Author(s):  
Guillaume Riboux ◽  
Álvaro Gómez-Marín ◽  
Antonio Barrero ◽  
Alberto Fernández-Nieves ◽  
Ignacio G. Loscertales
Keyword(s):  
Electric Energy ◽  
Theoretical Models ◽  
Polymer Fibers ◽  
Liquid Jets ◽  
Experimental Characterization ◽  
Thin Polymer ◽  
Electrified Jets ◽  
Liquid Flows ◽  
Capillary Liquid

AbstractCapillary liquid flows have shown their ability to generate micro and nano-structures which can be used to synthesize material in the micro or nanometric size range. For instance, electrified capillary liquid jets issued from a Taylor are broadly used to spin micro and nanofibers when the liquid consists of a polymer solution or melt, a process termed electrospinning. In this process, the electrified capillary jet may develop a nonaxisymmetric instability, usually referred to as whipping instability, which very efficiently transforms electric energy into stretching energy, thus leading to the formation of extremely thin polymer fibers. Even though non axysimmetric instabilities of electrified jets were first investigated some decades ago, the existing theoretical models provide a qualitative understanding of the phenomenon but none of them is accurate enough when compared with experimental results. This whipping instability usually manifests itself as fast and violent lateral motion of the charged jet, which makes it difficult its characterization in the laboratory. However, this instability also develops when electrospinning is performed within a liquid bath instead of air. Although it is essentially the same phenomenon, the frequency of the whipping oscillations is much slower in the former case than in the latter, thus allowing detailed experimental characterization of the whipping instability. Furthermore, since the outer fluid is a liquid, its density and viscosity may now be used to influence the dynamics of the electrified capillary jet. In this work we present and rationalize the experimental data collecting the influence of the main parameters on the whipping characteristics of the electrified jet (frequency, amplitude, etc.).

Ligament characterization of atomizing non-Newtonian liquid sheets: Fractal dimension

2018 ◽  
Vol 233 (1) ◽  
pp. 173-178
Author(s):  
Yue Zhao ◽  
Lijun Yang ◽  
Qingfei Fu
Keyword(s):  
Fractal Dimension ◽  
Newtonian Liquid ◽  
Liquid Jets ◽  
Rocket Engines ◽  
Experimental Conditions ◽  
Liquid Sheets ◽  
Two Jets ◽  
Xanthan Gum Solution

As gel propellants are increasingly used in rocket engines, non-Newtonian liquid atomization has emerged as a research subject of great interest. This paper addresses the atomization of flat sheets of aqueous xanthan gum solution, which are formed from two jets ejected from impinging injectors. Based on the experimental photos, it has been found that gel liquid sheets do not break up directly into droplets that can be characterized as spheres with Sauter mean diameter; instead, a mass of ligaments is observed. Therefore, this paper will introduce fractal dimension as a new parameter, related to the quality of atomization under these experimental conditions; and a power-law correlation between fractal dimension and Reynolds number of liquid jets has been achieved.

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