Search for Exotic Shapes in Liquid-Drop Collisions

Menchaca‐Rocha, A.; Borunda, Mario F.; Hidalgo, S. S.; Huidobro, F.; Michaelian, K.; Rodríguez, Villamil

doi:10.1007/978-1-4757-9086-3_41

Cited by 2 publications

(11 citation statements)

References 4 publications

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“…Many of the latter difficulties are addressed by introducing stroboscopic, high-speed digital video (DV) techniques to observe and analyze the drop trajectories and collisions in free fall. Since students are often dealing with simulations of nuclear collisions, the type of analysis described by Menchaca-Rocha et al [26][27][28] is employed.…”

Section: Description Of Apparatusmentioning

confidence: 99%

“…Two different collision outcomes are expected to exist for colliding drops: coalescence and fragmentation. [26][27][28] The boundary between these regimes is a function of the relative closing velocity, impact parameter (i.e., the centrality of the collision), the drops' densities, their viscosities, and the surface tension of the liquids. The apparatus permits the use of a variety of drop sizes, impact parameters, and liquid properties, so that students can investigate the collisions in each of these regimes.…”

Section: Description Of Apparatusmentioning

confidence: 99%

“…In the case of colliding drops, the latter is the ratio of the colliding drop diameters (D). 7,13,[26][27][28] The Weber number for drops of similar size is calculated using the relation We ¼ qv 2 d=r;…”

Section: Experimental Procedures and Analysismentioning

confidence: 99%

“…In the collision of drops of different diameters, it is customary to use the diameter of the smaller drop in calculating the Weber and Reynolds numbers. [26][27][28] The impact parameter b describes the centrality of the collision and is graphically shown in Fig. 2, where b ¼ 0 for central collisions and b ¼ d=2 for exactly grazing collisions.…”

Section: Experimental Procedures and Analysismentioning

confidence: 99%

“…Thus, a macroscopic model of a non-compressible fluid such as the LDM can provide a surprisingly accurate representation of basic nuclear properties, such as nuclear masses and reaction Q-values, 14 fusion and fission, [15][16][17][18][19][20][21][22][23][24] and nucleus-nucleus collisions. [25][26][27][28][29] Here, we describe an apparatus 30 utilizing video capture [31][32][33][34] specifically designed to illustrate key features of many types of nuclear and other collisions using various (charged and uncharged) liquids, 35 including oil, water, water with glycerine, and water with a wetting agent. Oil drops best represent the conditions found in nuclear collisions, while collisions of other liquids can provide insight into a wide variety of other collisional phenomena, including collisions involving sub-atomic particles, molecules, asteroids, planets, galaxies, and even neutron stars.…”

Section: Introductionmentioning

confidence: 99%

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Colliding nuclei to colliding galaxies: Illustrations using a simple colliding liquid-drop apparatus

Becchetti

Mack

Robinson

et al. 2015

American Journal of Physics

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A simple apparatus suitable for observing the collisions between drops of fluids of various properties is described. Typical results are shown for experiments performed by undergraduate students using various types of fluids. The collisions take place under free-fall (zero-g) conditions, with analysis employing digital video. Two specific types of collisions are examined in detail, head-on collisions and peripheral, grazing collisions. The collisions for certain fluids illustrate many types of nuclear collisions and provide useful insight into these processes, including both fusion and non-fusion outcomes, often with the formation of exotic shapes or emission of secondary fragments. Collisions of other liquids show a more chaotic behavior, often resembling galactic collisions. As expected, the Weber number associated with a specific collision impact parameter is found to be the important quantity in determining the initial outcome of these colliding systems. The features observed resemble those reported by others using more elaborate experimental techniques. V

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Section: Description Of Apparatusmentioning

confidence: 99%

Section: Description Of Apparatusmentioning

confidence: 99%

Section: Experimental Procedures and Analysismentioning

confidence: 99%

Section: Experimental Procedures and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Colliding nuclei to colliding galaxies: Illustrations using a simple colliding liquid-drop apparatus

Becchetti

Mack

Robinson

et al. 2015

American Journal of Physics

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Pinching Dynamics and Satellite Droplet Formation in Symmetrical Droplet Collisions

2019

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In head-on collisions between two droplets, reflexive separation is frequently formed, showing tentative coalescence followed by disintegration into two primary drops. With higher impact inertia relative to surface tension, characterized by a Weber number (We), more satellite droplets are created between the primary drops. In the symmetric configuration, the existing phenomenological models indicate the absence of satellite droplets at the onset We when the coalesced drops start to break. Supported by experimental and simulation evidence, here we demonstrate the exclusive formation of at least one droplet after pinch of the thread connecting the colliding drops. In accordance with the universal features of a thinning liquid filament approaching singularity as predicted by scaling theories of pinch-off, the mechanism of satellite droplet formation in the symmetrical impact of droplets is clarified. Via slight breaking of the symmetry, no satellite droplet can be observed, thus providing a possible interpretation for the discrepancy in the literature and implications for controlling undesirable drop formation.

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Search for Exotic Shapes in Liquid-Drop Collisions

Cited by 2 publications

References 4 publications

Colliding nuclei to colliding galaxies: Illustrations using a simple colliding liquid-drop apparatus

Colliding nuclei to colliding galaxies: Illustrations using a simple colliding liquid-drop apparatus

Pinching Dynamics and Satellite Droplet Formation in Symmetrical Droplet Collisions

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