Computer Science – Sound
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.590..515s&link_type=abstract
In: 17th ESA Symposium on European Rocket and Balloon Programmes and Related Research, 30 May - 2 June 2005, Sandefjord, Norway.
Computer Science
Sound
Microgravity
Scientific paper
We have investigated experimentally solidification phenomena in-situ in a transparent organic alloy under microgravity and time-dependent conditions during the sounding rocket mission TEXUS-40. In a Bridgman type furnace a constant temperature gradient was established along the sample within a thin cell. The application of a defined cooling rate forced the solid-liquid interface within the sample to accelerate and to transform from a planar front into cellular and dendritic structures. The macroscopic interface and the microscopic structures were observed with cameras. Here the images were analysed concerning the onset and evolution of the cellular structures. The experimental results were compared to predictions combining a macroscopic thermal model with a solutal diffusion or a microscopic phase-field model. A good agreement is then found for the planar interface dynamics as well as in the cellular regime. Thus the experimental results serve as important benchmarks for the numerical modelling and prediction of dynamic solidification.
Sturz Laszlo
Weiß Annette
Zimmermann Gerhard
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