Shifting and breakup instabilities of squeezed elliptic jets

Pillai, Dipin S.; Picardo, Jason R.; Pushpavanam, S.

doi:10.1016/j.ijmultiphaseflow.2014.09.004

Cited by 9 publications

(3 citation statements)

References 22 publications

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“…The axis-switching phenomenon and jet breakup in low speeds were also investigated through numerical simulations conducted by Farvardin and Dolatabadi. 6 It was analytically found by Pillai et al 7 that axis-switching was not the only source of instability for elliptical jets and even in the absence of axis-switching, an elliptical jet was less stable than a circular jet, apparently owing to its interfacial curvature effects. Recently, the axis-switching amplitude of free-falling elliptical jets was further examined by Ma and Zhu.…”

Section: Introductionmentioning

confidence: 99%

Entrance length effects on the flow features of rectangular liquid jets

Aliyoldashi

Tadjfar

Jaberi

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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An experimental study was carried out to investigate the effects of entrance length on the main characteristics of rectangular liquid jets discharged into the stagnant atmosphere. Six rectangular nozzles, all with the same aspect ratio of 3 but with different entrance length ratios ranging from 3.3 to 60 were constructed. The physics of the fluid flows was visualized by the aid of backlight shadowgraph technique and high speed photography. Flow visualizations revealed that in the mid-range of Weber numbers, the perturbations induced over the liquid surface remarkably depended on the entrance length ratio. Moreover, the characteristics of the axis-switching instability of rectangular liquid jets were measured. It was found that axis-switching wavelength was independent of the entrance length, while the amplitude of axis-switching was directly influenced. For entrance length ratios smaller than 10, the amplitude was increased with increase of entrance length, whereas for entrance length ratios higher than 10, this trend was reversed. Measurements of breakup length also showed that the transition of flow regimes was not perceptibly affected by the entrance length.

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Section: Introductionmentioning

confidence: 99%

Entrance length effects on the flow features of rectangular liquid jets

Aliyoldashi

Tadjfar

Jaberi

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…In their later study, Amini and Dolatabadi 7 experimentally studied the free and forced breakup behavior of elliptical liquid jets and, by taking advantage of spatial instability analysis, examined the main characteristics of elliptical jets. Further investigation on the instability features of elliptical jets was performed by Pillai et al., 8 where they showed that aside from the axis-switching, the instability of elliptical jets was higher than a circular jet, solely due to the interfacial curvature effects. Recently, Gu et al.…”

Section: Introductionmentioning

confidence: 99%

Comparative study on interfacial oscillations of rectangular and elliptical liquid jets

Jaberi

Tadjfar

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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The instability characteristics and flow structures of water jets injected from rectangular and elliptical nozzles with aspect ratios varying from 2 to 6 were experimentally studied and compared. Shadowgraph technique was employed for flow visualization, and structures on the liquid jet surface were captured using high speed photography. It was found that disturbances originating from the nozzle geometry initially perturbed the liquid column, and then, at high jet velocities, disturbances generated within the flow dominated the jet surface. It was also found that rectangular nozzles introduced more disturbances into the flow than the elliptical ones. The characteristic parameters of axis-switching phenomenon including wavelength, frequency, and amplitude were measured and compared. Axis-switching wavelength was found to increase linearly with Weber number. Also, the wavelengths of rectangular jets were longer than the elliptical jets. Further, the frequency of axis-switching was shown to be reduced with increase of both Weber number and aspect ratio. It was observed that the axis-switching amplitude increased monotonically, reached a peak, and then decreased gradually. It was also found that the axis-switching amplitude varied with Weber number. At lower values of Weber number, the rectangular nozzles had higher amplitude than the elliptical nozzles. However, at higher values of Weber number, this relation was reversed, and the elliptical nozzles had the higher axis-switching amplitudes. This reversal Weber number decreased with the orifice aspect ratio. The reversal Weber number for aspect ratio of 4 was about 289, and it had decreased to 144 for the aspect ratio of 6.

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“…Sikalo et al [25] have shown that Weber number alone is not able to quantify the impact and splash dynamics, but the surface roughness also affects the maximum spreading diameter of droplet. Even though the literature containing fundamental research work on droplet dynamics [26][27][28], jet dynamics [29,30], jet breakup [31][32][33][34][35], droplet impact on the conventional surfaces [36,37] as well as on the patterned or textured surfaces [38][39][40] is available; deformation of impinged droplets on the curved-grooved surfaces has not been well explored yet. Xu et al [14] experimentally studied the dynamics of a single droplet impact on a burning fuel liquid surface and reported the influence of impact velocity on the fire plume.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of spreading of impinged droplets on the curved-grooved surface

Lad

2017

J Braz. Soc. Mech. Sci. Eng.

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Impact of droplets on rough surfaces has many industrial applications. Various types of splashing and spreading of liquid droplets result due to impingement of the droplets on the different surfaces incorporating formation of satellite droplets. Dynamics of splashing and spreading is different with respect to the point of impactgroove or hill-on the grooved surface. Physics of spreading of impacted droplets on the curved-grooved surfaces is not known so far. Impact of droplets on curvedgrooved surface has been studied for a narrow range of Weber number to know the abrupt change in projected area of splashed droplets. Such abrupt change in the geometry of splashed droplets due to exaggerated elongation in the direction of groove was observed for narrow range of Weber numbers from 42 to 45. The present findings explore new direction for further fundamental research work to comprehend the physics of dynamics of impacted droplets for development of new theory helpful for spray painting, printing, and designing of shielding structures.

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Shifting and breakup instabilities of squeezed elliptic jets

Cited by 9 publications

References 22 publications

Entrance length effects on the flow features of rectangular liquid jets

Entrance length effects on the flow features of rectangular liquid jets

Comparative study on interfacial oscillations of rectangular and elliptical liquid jets

Dynamics of spreading of impinged droplets on the curved-grooved surface

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