Multi-scale analysis of atomizing liquid ligaments

Dumouchel, Christophe; Blaisot, Jean‐Bernard; Bouche, Emmanuella; Ménard, Thibaut; Vu, Trung-Thanh

doi:10.1016/j.ijmultiphaseflow.2015.03.020

Cited by 18 publications

(11 citation statements)

References 23 publications

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“…The presentation is restricted to the elements relevant for the present work. (More details are available in [6][7][8][9].) The 2D multi-scale description of a liquid system consists in…”

Section: D Multi-scale Descriptionmentioning

confidence: 99%

“…Quite often this detection is made easier by imposing the perturbation frequency that annihilates the temporal and spatial variabilities of the jet behavior [5]. This constraint may be skipped by using a multi-scale tool such as the one recently introduced to describe and analyze timedependent fluid domains in atomization processes [6][7][8]. In this technique, any fluid region delimited by an interface is described by a scale distribution that is measured as a function of time.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multi-scale analysis of a viscoelastic liquid jet

Tirel

Renoult

Dumouchel

et al. 2017

Journal of Non-Newtonian Fluid Mechanics

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A multi-scale analyzing tool is now available to investigate the temporal evolution of two phase flows such as liquid systems experiencing an atomization process. Thanks to its multi-scale and global nature, it allows identifying all dynamics simultaneously involved in the process with no restriction of the liquid system shape. In the present work this multi-scale tool is applied on 2D visualizations of free falling jets of a low-viscosity viscoelastic solution. The jets are produced from a cylindrical discharge orifice and the liquid is a very dilute polymer solution containing 5 PPM of Poly(ethylene oxide). High spatial resolution images of the free falling jets are performed as a function of the velocity and at several distances from the discharge orifice. For every operating condition, the liquid jet remains cylindrical first, then shows the development of a sinusoidal perturbation and finally adopts a beads-on-a-string pattern before breakup occurs. The multi-scale analysis is performed on a high number of images and at several spatial positions in order to return statistical and temporal information, respectively. The results of this analysis show that during the sinusoidal perturbation stage, the large-scale region follows an exponential increase as predicted by the linear stability theory and during the beads-on-a-string

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“…The presentation is restricted to the elements relevant for the present work. (More details are available in [6][7][8][9].) The 2D multi-scale description of a liquid system consists in…”

Section: D Multi-scale Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-scale analysis of a viscoelastic liquid jet

Tirel

Renoult

Dumouchel

et al. 2017

Journal of Non-Newtonian Fluid Mechanics

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“…The interface structures of air-assisted water jets were studied by Zhao et al (2014Zhao et al ( , 2015 with a high-speed photography. With the help of a high-speed visualization method, the temporal evolution of ligament is captured and measured by Dumouchel et al (2015). The optical connectivity, electrical connectivity and shadowgraphy were used in Charalampous's work (Charalampous et al 2016) to investigate the interface structure of liquid jet.…”

Section: Introductionmentioning

confidence: 99%

Measurement and Investigation on the Jet Interface Structure

Gong¹,

Yang²,

Jia³

2017

JAFM

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The well understanding of interface structure of liquid jet is the basis of the research of primary breakup. In this paper, the interface structure of liquid jet is captured by using a high-speed photography. The key parameters of interface structure, streamwise wavelength, spanwise wavelength and generation position, are measured based on a power spectral method. The results show that jet interface is featured by a group of periodic structures in the region near the nozzle exit. The position where periodic structure generated fluctuates in a certain region with the variation of time and spanwise position. The spanwise wavelength of these periodic structures is the function of nozzle diameter and the wavelength increase ratio of transition region. Along the streamwise direction, the streamwise wavelengths of these structures increase with a small ratio. With the Weber number increase, the streamwise wavelength is significantly decreased while the spanwise wavelength has no remarkable change. A Reynolds number that defined with streamwise distance, jet velocity and viscosity is proposed to estimate the onset of interface structure, and Reynolds number is equal to 42000 in this paper.

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“…Overcoming this problem requires a good understanding of the scale diffusion mechanism in the context of liquid atomization processes. For this task, the recent introduction of the concept of the scale-diameter could be considered [15]. This length is equal to the inverse of the first derivative of E 2 (d).…”

Section: Introductionmentioning

confidence: 99%

“…The temporal evolution of the scalediameters leads to a scale segregation according to their own perception of the whole system evolution. Furthermore, for the case of atomizing stretched ligaments, the quality of this perception allows identifying the physical mechanisms involved in the breakup process [15]. The present investigation aims to produce a multi-scale analysis of the atomization process of a jet produced by a Gasoline Direct Injector (GDI) with the objectives of reaching a detailed description of the scale diffusion mechanism and of determining the scale diffusivity parameter.…”

Section: Introductionmentioning

confidence: 99%