Melting processes under microgravity conditions

Details Melting processes under microgravity conditions Melting processes under microgravity conditions

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003adspr..32..237g&link_type=abstract

Advances in Space Research, Volume 32, Issue 2, p. 237-242.

Computer Science

Scientific paper

The kinetics of melting pivalic acid (PVA) dendrites was observed under convection-free conditions on STS-87 as part of the United States Microgravity Payload Mission (USMP-4) flown on Columbia in 1997. Analysis of video data show that PVA dendrites melt without relative motion with respect to the quiescent melt phase. Dendritic fragments display shrinking to extinction, with fragmentation occurring at higher initial supercoblings. Individual fragments follow a characteristic time-dependence derived elsewhere. The microgravity melting kinetics against which the experimental observations are compared is based on conduction-limited quasi-static melting under shape-preserving conditions. Agreement between analytic theory and our experiments is found when the melting process occurs under shape-preserving conditions as measured using the C/A ratio of individual needle-like crystal fragments.

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