Quantitative, three-dimensional diagnostics of multiphase drop fragmentation via digital in-line holography

Gao, Jian; Guildenbecher, Daniel Robert; Reu, Phillip L.; Kulkarni, Varun; Sojka, Paul E.; Chen, Jun

doi:10.1364/ol.38.001893

Cited by 71 publications

(40 citation statements)

References 12 publications

(18 reference statements)

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“…See figure 15 for axisymmetric simulation results immediately after rupture when x fine = 38 µm. We remark that the size of the smallest drops in the bag breakup experiments reported in Gao et al (2013) were 30 µm in diameter. The experiments in Gao et al (2013) involved speeds of approximately 10 m s −1 whereas in our case the characteristic speed is 0.13 m s −1 .…”

Section: Remarksmentioning

confidence: 67%

“…We remark that the size of the smallest drops in the bag breakup experiments reported in Gao et al (2013) were 30 µm in diameter. The experiments in Gao et al (2013) involved speeds of approximately 10 m s −1 whereas in our case the characteristic speed is 0.13 m s −1 . Also the experiments in Gao et al (2013) involved gas and liquid instead of a liquid/liquid system.…”

Section: Remarksmentioning

confidence: 67%

“…The finest three-dimensional numerical resolution that is used in this work is x = 0.06 cm for the Eo = 25.4 case (the minimum resolution of our experimental equipment was also approximately 0.06 cm). We hypothesize that the breakup mechanisms for toroidal drop breakup are most closely related to 'bag-breakup' as discussed in Han & Tryggvason (1999), Flock et al (2012, Jalaal & Mehravaran (2012) and Gao et al (2013). We tried to determine the grid resolution that would be necessary to capture this thin membrane by performing a grid refinement study in three-dimensional axisymmetric R-Z coordinates.…”

Section: Remarksmentioning

confidence: 99%

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Influence of the viscosity ratio on drop dynamics and breakup for a drop rising in an immiscible low-viscosity liquid

et al. 2014

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In a low Morton number (M) regime, the stability of a single drop rising in an immiscible viscous liquid is experimentally and computationally examined for varying viscosity ratio η (the viscosity of the drop divided by that of the suspending fluid) and varying Eötvös number (Eo). Three-dimensional computations, rather than three-dimensional axisymmetric computations, are necessary since non-axisymmetric unstable drop behaviour is studied. The computations are performed using the sharp-interface coupled level-set and volume-of-fluid (CLSVOF) method in order to capture the deforming drop boundary. In the lower η regimes, η = 0.02 or 0.1, and when Eo exceeds a critical threshold, it is observed that a rising drop exhibits nonlinear lateral/tilting motion. In the higher η regimes, η = 0.1, 1.94, 10 or 100, and when Eo exceeds another critical threshold, it is found that a rising drop becomes unstable and breaks up into multiple drops. The type of breakup, either 'dumbbell', 'intermediate' or 'toroidal', depends intimately on η and Eo.

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Section: Remarksmentioning

confidence: 67%

Section: Remarksmentioning

confidence: 67%

Section: Remarksmentioning

confidence: 99%

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Influence of the viscosity ratio on drop dynamics and breakup for a drop rising in an immiscible low-viscosity liquid

et al. 2014

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“…For example, in Gao et al [11], we report on the experimental quantification of the breakup of an ethanol drop in an air-stream. This phenomenon is a fundamental mechanism in the formation of fuel sprays and is of interest as a canonical problem for validation of multiphase simulations.…”

Section: Hybrid Methods Of Particle Detectionmentioning

confidence: 99%

“…This report summarizes developments in DIH obtained during the course of a Laboratory Directed Research and Development (LDRD) project at Sandia National Laboratories spanning the January 2011 to December 2013 timeframe. Following a brief explanation of the underlying principles and challenges, specific developments are presented with reference to a number of published works [3][4][5][6][7][8][9][10][11][12][13]. Figure 2 shows the basic experimental configuration of DIH.…”

Section: Introductionmentioning

confidence: 99%

Developments in digital in-line holography enable validated measurement of 3D particle field dynamics

Guildenbecher

2013

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Digital in-line holography is an optical technique which can be applied to measure the size, three-dimensional position, and three-component velocity of disperse particle fields. This work summarizes recent developments at Sandia National Laboratories focused on improvement in measurement accuracy, experimental validation, and applications to multiphase flows. New routines are presented which reduce the uncertainty in measured position along the optical axis to a fraction of the particle diameter. Furthermore, application to liquid atomization highlights the ability to measure complex, three-dimensional structures. Finally, investigation of particles traveling at near sonic conditions prove accuracy despite significant experimental noise due to shock-waves.4

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Size Distribution and Dispersion of Droplets Generated by Impingement of Breaking Waves on Oil Slicks

et al. 2017

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This laboratory experimental study investigates the temporal evolution of the size distribution of subsurface oil droplets generated as breaking waves entrain oil slicks. The measurements are performed for varying wave energy, as well as large variations in oil viscosity and oil‐water interfacial tension, the latter achieved by premixing the oil with dispersant. In situ measurements using digital inline holography at two magnifications are applied for measuring the droplet sizes and Particle Image Velocimetry (PIV) for determining the temporal evolution of turbulence after wave breaking. All early (2–10 s) size distributions have two distinct size ranges with different slopes. For low dispersant to oil ratios (DOR), the transition between them could be predicted based on a turbulent Weber (We) number in the 2–4 range, suggesting that turbulence plays an important role. For smaller droplets, all the number size distributions have power of about −2.1, and for larger droplets, the power decreases well below −3. The measured steepening of the size distribution over time is predicted by a simple model involving buoyant rise and turbulence dispersion. Conversely, for DOR 1:100 and 1:25 oils, the diameter of slope transition decreases from ∼1 mm to 46 and 14 µm, respectively, much faster than the We‐based prediction, and the size distribution steepens with increasing DOR. Furthermore, the concentration of micron‐sized droplets of DOR 1:25 oil increases for the first 10 min after entrainment. These phenomena are presumably caused by the observed formation and breakup oil microthreads associated with tip streaming.

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Quantitative, three-dimensional diagnostics of multiphase drop fragmentation via digital in-line holography

Cited by 71 publications

References 12 publications

Influence of the viscosity ratio on drop dynamics and breakup for a drop rising in an immiscible low-viscosity liquid

Influence of the viscosity ratio on drop dynamics and breakup for a drop rising in an immiscible low-viscosity liquid

Developments in digital in-line holography enable validated measurement of 3D particle field dynamics

Size Distribution and Dispersion of Droplets Generated by Impingement of Breaking Waves on Oil Slicks

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