Threedimensional collision analysis of millimetersized dust aggregates R
- Slides: 18
Three-dimensional collision analysis of millimeter-sized dust aggregates R. Weidling and J. Blum, IGEP, TU Braunschweig r. weidling@tu-bs. de
Motivation Bouncing Fragmentation Sticking after Güttler et al. , 2010 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates
Motivation Bouncing Sticking Fragmentation • no experiments at transition sticking bouncing at that time • transition derived from theory after Güttler et al. , 2010 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates
MEDEA bellows LED arrays shaker platform upper flange glass vacuum chamber lower flange vacuum chamber prism shaker platform motorized excentric wheel 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates high-speed camera
MEDEA 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates
Experiment 2 µm • 1 -1. 6 mm-sized dust aggregates made up of polydisperse Si. O 2 • 3 shaking phases with successively decreasing frequency 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates
Results • 43 collisions analyzed in 3 D • 9 collisions analyzed in 2 D • 4 x sticking, 48 x bouncing • 7 collisions of monomers with dimers (2 D) • monomers bounce off dimers, but dimer survives • collision velocities : 3. 4 mm/s – 62. 4 mm/s 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates
Results - Bouncing 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates
Results - Bouncing 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates
Results - Bouncing 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates
Results - Sticking 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates
Results – Monomer vs Dimer 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates
Update: Collision Model based on Kothe et al. , 2013 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates
Results: 3 D vs. 2 D 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates
Results: 3 D vs. 2 D 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates
Results: 3 D vs. 2 D 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates
Results: 3 D vs. 2 D 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates
Summary • 2 D velocity analysis sufficient (in MEDEA-type experiments) • coefficients of restitution in 2 D with statistical value • 3 D analysis mandatory for collision parameter • collision model needs further refinement • „lucky winners“ can survive further collisions 09. 2014 | R. Weidling | Three-dimensional collision analysis of millimeter-sized dust aggregates