A zero-gravity instrument to study low velocity collisions of fragile particles at low temperatures

Salter, D. M.; Heißelmann, D.; Molano, G. Chaparro; Wolk, G. van der; Reissaus, P.; Borst, A. G.; Dawson, Rach; Kuyper, E. de; Drinkwater, G.; Gebauer, Kathrin; Hutcheon, M.; Linnartz, H.; Molster, Frank; Stoll, B.; Tuijn, P. C. van der; Fraser, H. J.; Blum, Jürgen

doi:10.1063/1.3155508

Cited by 10 publications

(7 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…impact parameter and relative velocity). For a more detailed technical description please refer to Salter et al (2009). 41 image sequences of colliding ice spheres (15 mm diameter) were recorded during DLR's 12 th Parabolic Flight Campaign in April 2008.…”

Section: Parabolic Flight Experimentsmentioning

confidence: 99%

Microgravity experiments on the collisional behavior of saturnian ring particles

Heißelmann

Blum

Fraser

et al. 2010

Icarus

View full text Add to dashboard Cite

In this paper we present results of two novel experimental methods to investigate the collisional behavior of individual macroscopic icy bodies. The experiments reported here were conducted in the microgravity environments of parabolic flights and the Bremen drop tower facility. Using a cryogenic parabolic-flight setup, we were able to capture 41 near-central collisions of 1.5-cm-sized ice spheres at relative velocities between 6 and . The analysis of the image sequences provides a uniform distribution of coefficients of restitution with a mean value of and values ranging from ε=0.06 to 0.84. Additionally, we designed a prototype drop-tower experiment for collisions within an ensemble of up to one hundred cm-sized projectiles and performed the first experiments with solid glass beads. We were able to statistically analyze the development of the kinetic energy of the entire system, which can be well explained by assuming a granular 'fluid' following Haff's law with a constant coefficient of restitution of ε=0.64. We could also show that the setup is suitable for studying collisions at velocities of <5 mm s−1 appropriate for collisions between particles in Saturn's dense main rings

show abstract

Section: Parabolic Flight Experimentsmentioning

confidence: 99%

Microgravity experiments on the collisional behavior of saturnian ring particles

Heißelmann

Blum

Fraser

et al. 2010

Icarus

View full text Add to dashboard Cite

show abstract

“…The experimental apparatus has been previously described in detail (Salter et al (2009)) and is shown in Figure 1. The experiment combines three main components.…”

Section: Experimental Methodsmentioning

confidence: 99%

Collision of centimeter-sized particles

Ghesquière

Deguin

Gärtner³

et al. 2019

Proc. IAU

View full text Add to dashboard Cite

A characterisation of the collision properties between icy interstellar grains is crucial to understand planet formation. Here, we measure collision properties on a reference elastic system to evaluate the inelasticity of ice particles collisions. We propose upgrades to correct for some experimental biases and to investigate water evaporation as possible explanation for the energy loss during collision.

show abstract

“…The experimental apparatus has been previously described in detail (Salter et al 2009) and is shown in Fig. 1.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…1. Computer aided design schematic of the experimental setup (adapted fromSalter et al (2009). The particles are stored in a copper colosseum (1) which sits on top of a 45 kg copper block (2) which acts as a thermal reservoir.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Collisions of small ice particles under microgravity conditions

Hill

Heißelmann

Blum

et al. 2014

A&A

Self Cite

View full text Add to dashboard Cite

Context. Planetisimals are thought to be formed from the solid material of a protoplanetary disk by a process of dust aggregation. It is not known how growth proceeds to kilometre sizes, but it has been proposed that water ice beyond the snowline might affect this process. Aims. To better understand collisional processes in protoplanetary disks leading to planet formation, the individual low velocity collisions of small ice particles were investigated. Methods. The particles were collided under microgravity conditions on a parabolic flight campaign using a purpose-built, cryogenically cooled experimental setup. The setup was capable of colliding pairs of small ice particles (between 4.7 and 10.8 mm in diameter) together at relative collision velocities of between 0.27 and 0.51 m s −1 at temperatures between 131 and 160 K. Two types of ice particle were used: ice spheres and irregularly shaped ice fragments. Results. Bouncing was observed in the majority of cases with a few cases of fragmentation. A full range of normalised impact parameters (b/R = 0.0-1.0) was realised with this apparatus. Coefficients of restitution were evenly spread between 0.08 and 0.65 with an average value of 0.36, leading to a minimum of 58% of translational energy being lost in the collision. The range of coefficients of restitution is attributed to the surface roughness of the particles used in the study. Analysis of particle rotation shows that up to 17% of the energy of the particles before the collision was converted into rotational energy. Temperature did not affect the coefficients of restitution over the range studied.

show abstract

A zero-gravity instrument to study low velocity collisions of fragile particles at low temperatures

Cited by 10 publications

References 15 publications

Microgravity experiments on the collisional behavior of saturnian ring particles

Microgravity experiments on the collisional behavior of saturnian ring particles

Collision of centimeter-sized particles

Collisions of small ice particles under microgravity conditions

Contact Info

Product

Resources

About