Impacts of Viscous Dissipation on Collisional Growth and Fragmentation of Dust Aggregates

Arakawa, Sota; Tanaka, Hidekazu; Kokubo, Eiichiro

doi:10.3847/1538-4357/ac7460

Cited by 12 publications

(38 citation statements)

References 43 publications

(68 reference statements)

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“…However, the contribution of the rolling displacement is negligible for ξ crit 3.2 nm. In addition, Arakawa et al (2022) confirmed that contributions of sliding and twisting displacements also play a minor role; they are one order of magnitude smaller than E break .…”

Section: Interparticle Rolling Motionmentioning

confidence: 64%

“…We performed three-dimensional numerical simulations of collisions between two equal-mass dust aggregates. The numerical code used in this study is identical to that developed by Arakawa et al (2022), which considered the viscous drag for normal motion and also considered friction torques for tangential motions.…”

Section: Modelmentioning

confidence: 99%

“…The material parameters of waterice particles used in this study are listed in Table 1. The particle interaction model is identical to that used in Arakawa et al (2022).…”

Section: Materials Parametersmentioning

confidence: 99%

“…Recently, Arakawa et al (2022) performed numerical simulations of collisions between two equal-mass dust aggregates consisting of submicron-sized spherical ice particles. Surprisingly, they found that the main energy dissipation mechanism was not the viscous dissipation but the friction between particles in contact.…”

Section: Introductionmentioning

confidence: 99%

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Collisional Growth Efficiency of Dust Aggregates and Its Independence of the Strength of Interparticle Rolling Friction

Arakawa

Tanaka

Kokubo

2022

ApJ

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The pairwise collisional growth of dust aggregates consisting of submicron-sized grains is the first step of planet formation, and understanding the collisional behavior of dust aggregates is therefore essential. It is known that the main energy dissipation mechanisms are the tangential frictions between particles in contact, namely, rolling, sliding, and twisting. However, there is great uncertainty for the strength of rolling friction, and the dependence of the collisional growth condition on the strength of rolling friction was poorly understood. Here we performed numerical simulations of collisions between two equal-mass porous aggregates with various collision velocities and impact parameters, and we also changed the strength of rolling friction systematically. We found that the threshold of the collision velocity for the fragmentation of dust aggregates is nearly independent of the strength of rolling friction. This is because the total amount of the energy dissipation by the tangential frictions is nearly constant even though the strength of rolling friction is varied.

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Section: Interparticle Rolling Motionmentioning

confidence: 64%

Section: Modelmentioning

confidence: 99%

“…The material parameters of waterice particles used in this study are listed in Table 1. The particle interaction model is identical to that used in Arakawa et al (2022).…”

Section: Materials Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Collisional Growth Efficiency of Dust Aggregates and Its Independence of the Strength of Interparticle Rolling Friction

Arakawa

Tanaka

Kokubo

2022

ApJ

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“…Large impact parameters decrease the tendency for sticking as only parts of the colliding NPs come into close contact and experience their mutual attraction 52 , 59 . Recently, it was shown that energy dissipation in granular aggregates of water ice leads to different aggregation and fragmentation outcomes 60 . The present work indicates that phase transformation should be considered as a possible energy dissipation channel also for aggregate collisions.…”

Section: Discussionmentioning

confidence: 99%

Collisions between CO, CO$$_2$$, H$$_2$$O and Ar ice nanoparticles compared by molecular dynamics simulation

Nietiadi

Rosandi

Bringa

et al. 2022

Sci Rep

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Molecular dynamics simulations are used to study collisions between amorphous ice nanoparticles consisting of CO, CO$$_2$$ 2 , Ar and H$$_2$$ 2 O. The collisions are always sticking for the nanoparticle size (radius of 20 nm) considered. At higher collision velocities, the merged clusters show strong plastic deformation and material mixing in the collision zone. Collision-induced heating influences the collision outcome. Partial melting of the merged cluster in the collision zone contributes to energy dissipation and deformation. Considerable differences exist—even at comparable collision conditions—between the ices studied here. The number of ejecta emitted during the collision follows the trend in triple-point temperatures and increases exponentially with the NP temperature.

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The role of porosity in collisions of granular aggregates: A simulation study of fusion, sliding, and fragmentation collisions

Bandyopadhyay¹,

Umstätter²,

Urbassek³

2023

A&A

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Context. Collisions between porous dust aggregates are crucial for the evolution of protoplanetary disks. Aims. We study how the porosity, relative velocity, and impact parameter determine whether colliding dust aggregates grow or erode (fragment) in collisions. Methods. We used a granular-mechanics simulation of aggregates composed of 20 000 grains to determine the collision outcomes of colliding aggregates. Only collisions between aggregates of an equal mass and porosity are considered. Results. The collisional outcomes can be grouped into three classes: “fusion” if the mass of the largest post-collision cluster exceeds 150% of the mass of a single aggregate; “sliding” if the two largest post-collision clusters each contain more than 75% of the initial aggregate mass; and “fragmentation” as the remaining events. Fusion occurs for low velocities and impact parameters, sliding for large impact parameters, and fragmentation dominates at large velocities. The results for central collisions show no sliding and thus strongly differ from the impact-parameter-averaged results. Conclusions. With increasing aggregate porosity, the sliding probability – and to a lesser degree also the fusion probability at small velocities – decreases and the fragmentation probability increases.

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Impacts of Viscous Dissipation on Collisional Growth and Fragmentation of Dust Aggregates

Cited by 12 publications

References 43 publications

Collisional Growth Efficiency of Dust Aggregates and Its Independence of the Strength of Interparticle Rolling Friction

Collisional Growth Efficiency of Dust Aggregates and Its Independence of the Strength of Interparticle Rolling Friction

Collisions between CO, CO$$_2$$, H$$_2$$O and Ar ice nanoparticles compared by molecular dynamics simulation

The role of porosity in collisions of granular aggregates: A simulation study of fusion, sliding, and fragmentation collisions

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