Three-dimensional collision analysis of millimeter-sized dust aggregates R.Weidling and J. Blum, IGEP, TU Braunschweig r.weidling@tu-bs.de.

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Presentation transcript:

Three-dimensional collision analysis of millimeter-sized dust aggregates R.Weidling and J. Blum, IGEP, TU Braunschweig r.weidling@tu-bs.de

Bouncing Sticking Fragmentation Motivation Bouncing Sticking Fragmentation after Güttler et al., 2010 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

Bouncing Sticking Fragmentation Motivation no experiments at transition sticking - bouncing at that time transition derived from theory Bouncing Sticking Fragmentation after Güttler et al., 2010 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

bellows LED arrays shaker platform upper flange vacuum chamber MEDEA bellows LED arrays shaker platform upper flange vacuum chamber glass vacuum chamber lower flange prism shaker platform motorized excentric wheel high-speed camera 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

MEDEA 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

1-1.6 mm-sized dust aggregates made up of polydisperse SiO2 Experiment 2 µm 1-1.6 mm-sized dust aggregates made up of polydisperse SiO2 3 shaking phases with successively decreasing frequency 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

43 collisions analyzed in 3D 9 collisions analyzed in 2D Results 43 collisions analyzed in 3D 9 collisions analyzed in 2D 4x sticking, 48x bouncing 7 collisions of monomers with dimers (2D) monomers bounce off dimers, but dimer survives collision velocities : 3.4 mm/s – 62.4 mm/s 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

Results - Bouncing 044066: 0,048 m/s eps= 0,79, b/r=0,98 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

Results - Bouncing 092118: 0,029 m/s eps= 0,48, b/r=0,91 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

Results - Bouncing 092118: 0,029 m/s eps= 0,48, b/r=0,91 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

Results - Sticking 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

Results – Monomer vs Dimer 0,015 m/s 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

Update: Collision Model based on Kothe et al., 2013 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

Results: 3D vs. 2D Geschwindigkeit in 2D i.A. sehr gut -> 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

Results: 3D vs. 2D 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

Results: 3D vs. 2D 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

Results: 3D vs. 2D 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates

2D velocity analysis sufficient (in MEDEA-type experiments) Summary 2D velocity analysis sufficient (in MEDEA-type experiments) coefficients of restitution in 2D with statistical value 3D analysis mandatory for collision parameter collision model needs further refinement „lucky winners“ can survive further collisions 09.09.2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates