Abstract
The efficiency of motionless mixers for mixing free flowing solid particles has been studied by using a radioactive tracer technique. The tracer is produced by irradiating the particles (grains of wheat) with neutrons. Consequently, the surface and physical properties of the tracer particles are identical with those of the other particles. For the operating conditions studied in this work it appears that for a given number of passes there is a number of helices beyond which improved dispersion does not occur. Sampling and analysis of samples was achieved by gamma-ray spectroscopy without any disturbance to the final mixture.
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