High-magnification shadowgraphy for the study of drop breakup in a high-speed gas flow

Biasiori-Poulanges, Luc; El-Rabii, Hazem

doi:10.1364/ol.44.005884

Cited by 19 publications

(8 citation statements)

References 11 publications

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“…12) detach from the intact body and disintegrate separately. It is noteworthy that recent studies (Jalaal and Mehravaran 2014;Meng and Colonius 2018;Biasiori-Poulanges and El-Rabii 2019;Dorschner et al 2020) propose the mechanism of transverse azimuthal modulation as an alternative explanation for the generation of streamwise ligaments. It is stated that the growth of Kelvin-Helmholtz instabilities near the droplet periphery triggers Rayleigh-Taylor instabilities in the transverse plane which further lead to the formation of ligaments.…”

Section: Breakup Patternsmentioning

confidence: 99%

Effect of Mach number on droplet aerobreakup in shear stripping regime

et al. 2020

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The present experimental study investigates the shear stripping breakup of single droplets in subsonic and supersonic gaseous flows. In contrast to most research that places emphasis on the Weber number (We), we focus on the individual effects exerted by flow Mach (M∞) and Reynolds numbers (Re). Millimeter-sized droplets made of either ethylene glycol or water are exposed to shock-induced flows. Shadowgraph and schlieren images of the breakup process are recorded by an ultra-high-speed camera. The experimental We is constrained at 1100, while M∞ is varied from 0.3 to 1.19 and Re from 2600 to 24,000. A systematic analysis of the experiment series reveals that the breakup pattern alters with M∞ although a constant We is maintained. The classical stripping behavior with fine mist shed from the peripheral sheet changes to rupture of multiple bags along the periphery at M∞ = 0.63, and further to stretching of ligament structures from the leeward surface at M∞ = 1.19. The corresponding breakup initiation is delayed and the resultant fragments are sized less uniformly and distributed over a narrower spread. In terms of the early-stage deformation, droplets experience less intense flattening and slower sheet growth at higher M∞. The change of Re introduces additional variations, but only to a minor extent. Graphical abstract

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Section: Breakup Patternsmentioning

confidence: 99%

Effect of Mach number on droplet aerobreakup in shear stripping regime

et al. 2020

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“…The high-speed camera and the dual-cavity laser are synchronized by a digital delay generator. More details on the optical diagnostic are available in Biasiori-Poulanges & El-Rabii (2019). Sequences of the images displayed are captured with camera settings adjusted to record frames at pixel resolution with a sampling frequency of kHz.…”

Section: Experimental Set-upmentioning

confidence: 99%

On the formation and recurrent shedding of ligaments in droplet aerobreakup

et al. 2020

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“…Then, Meng & Colonius (2018) studied the interaction between a planar shock and a spherical droplet, hence analysing the droplet deformation characteristics. Through high-magnification and high-speed breakup images, Biasiori-Poulanges & El-Rabii (2019) demonstrated the evolution dynamics of the breakup process at a higher Weber number. Sharma et al.…”

Section: Introductionmentioning

confidence: 99%

Analysis of wave converging phenomena inside the shocked two-dimensional cylindrical water column

Fan

et al. 2023

J. Fluid Mech.

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Due to the curvature of the droplet surface, the propagation of transmitted waves is complex inside a droplet impacted by an incident shock wave. The wave converging phenomena inside a two-dimensional water column impacted by different curved shock waves are explored in this paper by means of theoretical ray analysis and high-resolution numerical simulations. An analytical method describing the wave structure evolution characteristics inside the shocked water column is established. Hence, the morphological pattern and focus locations of these waves are theoretically obtained. The analysis shows that both the first and the second reflected waves focus inside the water column regardless of the convergent, planar or divergent nature of the incident shock wave shape. The dimensionless distances from focusing points to the column centre are derived as ${\kappa }/{( 3\kappa -{{M}_{0}}{{f}_{s}} )}$ for the former and ${\kappa }/{( 5\kappa -{{M}_{0}}{{f}_{s}})}$ for the latter, respectively. Here, $\kappa$ , $M_0$ and $f_s$ represent the sound-speed ratio of the two phases, the incident shock wave strength and a function characterising the shock wave shape effect, respectively. Moreover, highly negative pressures due to the first reflected wave focusing and significant pressure oscillations due to the second reflected wave focusing are numerically tracked for three shapes of the incident shock. The effects of the incident shock wave intensity on the pressure variations at focus points are further studied. As the incident shock wave intensity increases, stronger negative pressure and higher pressure oscillation are induced. The converged incident shock wave can enhance the above phenomena, but the diverged one can weaken them.

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High-magnification shadowgraphy for the study of drop breakup in a high-speed gas flow

Cited by 19 publications

References 11 publications

Effect of Mach number on droplet aerobreakup in shear stripping regime

Effect of Mach number on droplet aerobreakup in shear stripping regime

On the formation and recurrent shedding of ligaments in droplet aerobreakup

Analysis of wave converging phenomena inside the shocked two-dimensional cylindrical water column

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