Effect of viscosity on droplet-droplet collisional interaction

Finotello, Giulia; Padding, JT Johan; Deen, NG Niels; Jongsma, Alfred; Innings, Fredrik; Kuipers, J.A.M.

doi:10.1063/1.4984081

Cited by 73 publications

(46 citation statements)

References 37 publications

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“…In particular, understanding the effect of viscosity and surface energy on binary droplet collisions is of great importance for understanding the outcomes of binary equal-sized droplet collision. The dynamics of binary equal-sized droplet collision has been investigated by numerous experimental and numerical studies (e.g., Ashgriz & Poo 1990;Finotello et al 2017). proposed the criteria for collisional sticking as follows:…”

Section: Resultsmentioning

confidence: 99%

Compound Chondrule Formation in Optically Thin Shock Waves

Arakawa

Nakamoto

2019

ApJ

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Shock-wave heating within the solar nebula is one of the leading candidates for the source of chondruleforming events. Here, we examine the possibility of compound chondrule formation via optically thin shock waves. Several features of compound chondrules indicate that compound chondrules are formed via the collisions of supercooled precursors. We evaluate whether compound chondrules can be formed via the collision of supercooled chondrule precursors in the framework of the shock-wave heating model by using semi-analytical methods and discuss whether most of the crystallized chondrules can avoid destruction upon collision in the post-shock region. We find that chondrule precursors immediately turn into supercooled droplets when the shock waves are optically thin and they can maintain supercooling until the condensation of evaporated fine dust grains. Owing to the large viscosity of supercooled melts, supercooled chondrule precursors can survive high-speed collisions on the order of 1 km s −1 when the temperature is below ∼ 1400 K. From the perspective of the survivability of crystallized chondrules, shock waves with a spatial scale of ∼ 10 4 km may be potent candidates for the chondrule formation mechanism. Based on our results from one-dimensional calculations, a fraction of compound chondrules can be reproduced when the chondrule-to-gas mass ratio in the pre-shock region is ∼ 2 × 10 −3 , which is approximately half of the solar metallicity.

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Section: Resultsmentioning

confidence: 99%

Compound Chondrule Formation in Optically Thin Shock Waves

Arakawa

Nakamoto

2019

ApJ

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“…However, these methods are not well adapted to describe topological changes of the interface, like coalescence and breakup phenomena. In the VOF method, coalescence happens automatically when two approaching interfaces share a common grid cell [13]. The Level-set method has similar problems: coalescence either happens automatically or it is not possible unless it is explicitly imposed [18].…”

Section: Introductionmentioning

confidence: 99%

Simulations of droplet collisions with a Diffuse Interface Model near the critical point

Gelissen

Geld

Kuipers

et al. 2018

International Journal of Multiphase Flow

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“…Moreover, from the kinetic energy evolution curve, it can be observed the kinetic energy at the final time was always less than 10% of the initial kinetic energy. The research of Finotello et al [23] showed that a collision can be considered completed when the residual kinetic energy was negligible. In Figure 12b, at the initial stage, as the surface tension decreases, the dissipated energy increases, so the coalescence time of the droplets in Figure 8 is delayed.…”

Section: Energy Evolutionmentioning

confidence: 99%

“…For binary Newtonian droplet collisions, the current studies [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] are mainly focused on two aspects: from binary low-viscosity droplet collisions to binary high-viscosity droplet collisions, and from binary homogeneous-droplet collisions to binary heterogeneous-droplet collisions. Jiang et al [9] and reflexive separation of droplets were investigated.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation on the Collision Behavior of Polymer Droplets

2020

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Binary droplet collisions are a key mechanism in powder coatings production, as well as in spray combustion, ink-jet printing, and other spray processes. The collision behavior of the droplets using Newtonian and polymer liquids is studied numerically by the coupled level-set and volume of fluid (CLSVOF) method and adaptive mesh refinement (AMR). The deformation process, the internal flow fields, and the energy evolution of the droplets are discussed in detail. For binary polymer droplet collisions, compared with the Newtonian liquid, the maximum deformation is promoted. Due to the increased viscous dissipation, the colliding droplets coalesce more slowly. The stagnant flow region in the velocity field increases and the flow re-direction phenomenon is suppressed, so the polymer droplets coalesce permanently. As the surface tension of the polymer droplets decreases, the kinetic and the dissipated energy increases. The maximum deformation is promoted, and the coalescence speed of the droplets slows down. During the collision process, the dominant pressure inside the polymer droplets varies from positive pressure to negative pressure and then to positive pressure. At low surface tension, due to the non-synchronization in the movement of the interface front, the pressure is not smooth and distributes asymmetrically near the center of the droplets.

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Effect of viscosity on droplet-droplet collisional interaction

Cited by 73 publications

References 37 publications

Compound Chondrule Formation in Optically Thin Shock Waves

Compound Chondrule Formation in Optically Thin Shock Waves

Simulations of droplet collisions with a Diffuse Interface Model near the critical point

A Numerical Investigation on the Collision Behavior of Polymer Droplets

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