Statistics – Applications
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..458..471b&link_type=abstract
Space technology and applications international forum -1999. AIP Conference Proceedings, Volume 458, pp. 471-476 (1999).
Statistics
Applications
Spaceborne And Space Research Instruments, Apparatus, And Components, Diffusion And Thermal Diffusion, Thermal Conduction In Nonmetallic Liquids
Scientific paper
Measurements of both species (mass) and thermal diffusivities on Earth are prone to be contaminated by convective contributions to the overall transport. Previous studies of mass and thermal diffusivities conducted on spacecraft have demonstration the gain in precision, and lower absolute values, resulting from the reduced convective transport possible in a low-gravity environment. We have developed a technique for the in-situ measurement of mass diffusivity in liquids at several temperatures utilizing a single sample. In this approach, which circumvents solidification of the diffusion sample prior to concentration profiling, the evolution of the concentration distribution of a radiotracer is followed in real time using two pairs of radiation detectors. A low-temperature version of this hardware was flown successfully on the Mir space station as a risk-mitigation experiment. The experimental hardware for the space station is based on this design. We will measure the self-diffusivity of several metal elements over a wide temperature range and the binary- and impurity-diffusivities of II-VI compounds approximately 100 K above their melting points. Thermal diffusivity measurement of the II-VI materials will be conducted in hardware presently in the design phase.
Banish Michael R.
Jalbert Lyle B.
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