Viscous Jet Breakup: Nonsinusoidal Disturbances

Scheller, B. L.; Bousfield, Douglas W.

doi:10.1080/00986449108911548

Cited by 3 publications

(4 citation statements)

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“…Chaudhary et al [31][32][33] used a sinusoidal disturbance with an added harmonic to study the merging of satellite droplets. Additionally, Scheller and Bousfield 34 used a nonsinusoidal disturbance to study the direction of satellite droplets. Huynh et al 35 also theoretically studied the instability of capillary jets subject to sinusoidal disturbances with added harmonics and found that a variety of droplet sizes and shapes could be generated at the time of droplet formation.…”

Section: Figmentioning

confidence: 99%

Electrostatic charging and deflection of nonconventional droplet streams formed from capillary stream breakup

et al. 2000

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Droplet streams generated from capillary stream breakup and forced with amplitude-modulated ͑a-m͒ disturbances will undergo a systematic interdroplet merging process due to their relative velocities that result from the am disturbance. This paper concerns the electrostatic charging of droplets generated with am disturbances, and seeks an understanding between the competitive effects of the electrostatic repulsive force and the momentum associated with relative velocities that are due to the am disturbance. To this end, experimental results and numerical simulations that are in excellent agreement and predict the configuration of the charged droplet stream are presented. In this work, droplets are generated with the aforementioned technique and are electrostatically charged. It has been found that for droplets generated with a disturbance with a high degree of modulation, m, the momentum of the droplets dominates over the electrostatic force causing the droplet merging process to be similar to the uncharged case as attested by both experimental results and numerical simulations. Here, m is the ratio of modulation to original carrier amplitudes. For droplets with lower values of m, the electrostatic forces dominate and it is found that the relative positions of the droplets will oscillate along the direction of their flight path with maximum excursions not exceeding one wavelength of the carrier disturbance ͑i.e., the separation of the unmerged droplets͒.

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Section: Figmentioning

confidence: 99%

Electrostatic charging and deflection of nonconventional droplet streams formed from capillary stream breakup

et al. 2000

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“…A more practical method of eliminating the formation of the satellite drops is by using a modulated disturbance. Chaudhary & Maxworthy (1980a,b) and Scheller & Bousfield (1991) provide results of such experiments. They use a modulated velocity disturbance composed of two frequencies, and show that the satellite drop formation can be most effectively prevented by the superposition of the first and third harmonics for certain ratios of the initial amplitudes of the two harmonics.…”

Section: Introductionmentioning

confidence: 99%

“…Although forward and backward merging occurs even with monochromatic disturbances, the merging can be expedited by using modulated disturbances. Chaudhary & Maxworthy (1980b), and Scheller & Bousfield (1991) use the two-frequency disturbances and measure the distance it takes for the satellite drops to merge with the main drops. They show that the merging distance depends on the amplitude ratio of the two frequencies and the phase angle between them.…”

Section: Introductionmentioning

confidence: 99%

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Instability of a liquid jet subject to disturbances composed of two wavenumbers

Huynh

Mashayek

1996

J. Fluid Mech.

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The instability of viscous capillary jets subject to disturbances consisting of two superposed wavenumbers, and for large disturbance amplitudes is investigated. Disturbances composed of the superposition of a fundamental disturbance (first harmonic) with either its second or third harmonic are used. The influence of the wavenumber of the fundamental disturbance on the jet breakup is studied for a disturbance composed of a first harmonic with an initial non-dimensional amplitude of ε1 = 0.01 and a second harmonic with an initial non-dimensional amplitude of ε2 = 0.05. The influence of the initial amplitudes of the first and second harmonics on the jet breakup is studied for two non-dimensional wavenumbers of the fundamental (first harmonic): k = 0.45 and k = 0.7; the second harmonic is unstable in the former and stable in the latter case. The effect of an added third harmonic is studied only for k = 0.45 but for a wide range of initial amplitudes. All cases are studied for an in-phase and a 180° out-of-phase superposition of the two waves. The nonlinear interaction between the two waves results in the formation of a variety of drop sizes and shapes. The breakup times can be controlled within a wide range using this technique.

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