Gas bubbles in glass melts under microgravity. Part 3. A further helium diffusion experiment
Gas bubbles in glass melts under microgravity. Part 3. A further helium diffusion experiment
- Neue Suche nach: Wendler, M.
- Neue Suche nach: Krüner, H.
- Neue Suche nach: Frischat, G.H.
- Neue Suche nach: Wendler, M.
- Neue Suche nach: Krüner, H.
- Neue Suche nach: Frischat, G.H.
The behaviour of gas bubbles in glass melts under microgravity was furthered with a helium bubble experiment carried out on board Space Shuttle Discoervy in January 1992. The shrinking of an isolated helium bubble was observed in a soda-lime-silica melt in order to determine the diffusion coefficient from the resulting radius-time curve. A new mathematical model was used to obtain the diffusion coefficient for temperatures up to 1186 deg C. This method was used also to extend the evaluation interval of the radius-time curve of the February 1984 nonisothermal microgravity helium bubble experiment by more than 100 K. From the two experiments an Arrhenius plot at 936 to 1186 deg C could be obtained with a frequency factor of D0 = 3x8 10-3cm2/s and an activation energy of E = 47x6 kJ/mol.
Dokumentinformationen
Gas bubbles in glass melts under microgravity. Part 3. A further helium diffusion experiment
Gasblasen in Glasschmelzen unter Bedingungen der Mikrogravitation. Teil 3. Ein weiteres Heliumdiffusionsexperiment
Physics and Chemistry of Glasses ; 36 , 3 ; 109-113
1995
5 Seiten, 9 Bilder, 1 Tabelle, 15 Quellen
Aufsatz (Zeitschrift)
Englisch
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