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Longitudinal mixing properties in liquid‐solid fluidized beds were investigated by means of a salt‐solution tracer technique. The electrical conductance breakthrough curves were measured with very small electrical conductivity probes for a step‐function input of salt‐solution tracer. Longitudinal eddy diffusivities were determined for 1.3‐ and 3.0‐mm. lead spheres and 3.2‐mm. glass spheres in 2‐ and 4‐in.–diameter beds at a distance of 5 bed diam. from the injector and for various radial positions. The longitudinal mixing properties are strongly affected by particle concentration; maximum mixing occurs at a fraction voids of 0.7. Longitudinal eddy diffusivity increases with particle density and with decreasing d p /D ratio. Velocity profiles markedly influence the eddy‐diffusivity profiles.
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Cairns et al. (1960) studied this question.
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