In-Situ Diffusivity Measurement Technique

Details In-Situ Diffusivity Measurement Technique In-Situ Diffusivity Measurement Technique

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999adspr..24.1311b&link_type=abstract

Advances in Space Research, Volume 24, Issue 10, p. 1311-1320.

Statistics

Methodology

2

Scientific paper

We have developed a technique for the measurement of diffusivities in liquids over a wide temperature range. A radiotracer, initially located at one end of the cylindrical diffusion sample, is used as the diffusant. The sample is positioned in a concentric isothermal radiation shield with collimation bores located at defined positions along its axis. The intensity of the radiation emitted through the collimators is measured vs. time with solid state detectors and associated energy discrimination electronics. Diffusivities are calculated from the signal difference between pairs of collimation bores. Self-diffusivities obtained with In/In114m in space and on Earth illustrate the high precision obtainable with this technique. The In/In114m space data were close to the ground results, however, the data scatter was much less. By employing a tracer that emits photons of different energy, and thus, different self-absorption, transport in the bulk of the sample can be distinguished from that in the proximity of the wall. No difference was found. In support of this work 2-D numerical modelling of the effect of various blockages on the concentration profile and the resulting apparent diffusivity were conducted. For the methodology that we use very little effect was seen except in the case of extreme blockages

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