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Resuspension of Particle Bed by Round Vertical Jet

An experimental study was carried out to investigate the resuspension (fluidization) of a loosely held monodispersed particle bed by a momentum jet, discharging from below. The work was motivated by its applications to limnological situations where the bottom sediments are suspended by a series of jets fed by a ground-water karstic system. Two different flow regimes were identified, and the conditions under which they occur were mapped on a regime diagram between the two important nondimensional variables, h o /d p and h o /(Mo1/2/w s), where h o is the height of the particle layer; w s is the particle-settling velocity; and M o is the momentum flux of the jet. The maximum height of rise of particles within the jet was also determined as a function of these nondimensional variables. Comparisons of laboratory and field observational results were also made.