Non-Invasive Photochromic-Tracer Studies of Particulate Suspensions and Granular Media
1997
Goddard, J. D.
The purpose of this report was to provide participation in the development of a non-invasive 3-D experimental visualization technique to probe the microstructure in deforming granular assemblages and particulate suspensions. The technique is based on the generation of transient streaks of colored particles in transparent fluid particle systems by means of the photochromic effect. Such streaks would then serve as tracers of motion within the particulate system. As one candidate system, a model transparent sand was made from crushed photochromic glass dispersed in a refractive index matched ZnCl solution. While the speed of the photochromic effect prevented the penetration of a mechanically non-invasive light beam into the system, other means have been explored for introduction of photochromically darkened particles.
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