Materials Sciences in Space: A Contribution to the by B. Feuerbacher (auth.), Prof. Berndt Feuerbacher, Dr.-Ing.

By B. Feuerbacher (auth.), Prof. Berndt Feuerbacher, Dr.-Ing. Hans Hamacher, Dr. Robert J. Naumann (eds.)

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Unit-gravity processed samples, and Fig. 17 shows the departure of the low-gravity resul ts from the A V2 = constant re 1at i onshi p predi cted by the Jackson and Hunt theory of eutect i c sol i difi cat ion. ~23] Subsequent experi ments on Earth using strong magnetic fields to damp the convection produced results similar to the flight experiments. [24] This is a peculiar result since the Jackson and Hunt theory does not consi der convection, yet departures from theory occur in the absence of convection.

3J. The flight mode in favour for conducting ~g-experiments is the Gravity Gradient Mode (GGM), an attitude in which the STS is stabil i zed by the earth gravity gradi ent, with the wi ngs in the orbital plane and the nose pointing outward from the center of earth. For 200 km, a level of ad: 10- 5 go is to be expected. Note the strong variation of ad in the low altitude range. A change from 200 to 300 km will result in Fig. 3: Prediction of Acceleration due to Atmospheric Drag ad vs Altitude for the Space Shuttle Orb i ter.

They were intended to provide material for classroom use that demonstrated the effects of virtual weightlessness. interesting scientific insights. In fact, they also provided some For example, it was shown that a liquid bridge simulating a molten floating zone could be extended to its theoretical Rayleigh limit (length equal to circumference) before it broke into two individual droplets, but an unsuspected "jump-rope" instability developed when the zone was rotated, as may be seen in Fig. 11. [3J This finding could have important implications for later attempts to grow crystals in space by the float zone technique.

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