SETTLING CHARACTERISTICS of CARROT PARTICLES IN VERTICAL PIPELINES

Abstract

The settling characteristics of carrot and plastic cylindrical particles has been investigated. the settling velocities in hindered and unhindered environments have been determined for particles of different diameters and aspect ratios. In settling studies using single particles, there was an initial increase in falling velocity with increasing aspect ratio. However, for aspect ratios above 2:1, the settling velocity reached a constant value, which then began to decrease as a function of the particle length. the results for particles subjected to hindered settling did not correlate well with existing literature except for low aspect ratio systems. Wall effects were studied and observed for particles with aspect ratios greater than 4.25:1. Fluidization data were compared with the results from settling tests for similar systems, and it was observed that the terminal falling velocity of a particle is mainly affected by drag only, but in fluidization, the transportation velocity is influenced by a combination of drag, wall and interparticle effects.

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