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The resuspension and dispersion of particles occur in industrial fluiddynamic processes as well as environmental and geophysical situations. In thispaper, we experimentally investigate the ability to fluidize a granular bedwith a vertical gradient of temperature. Using laboratory experiments with alocalized heat source, we observe a large entrainment of particles into thefluid volume beyond a threshold temperature. The buoyancy-driven fluidized bedthen leads to the transport of solid particles through the generation ofparticle-laden plumes. We show that the destabilization process is driven bythe thermal conductivity inside the granular bed and demonstrate that thethreshold temperature depends on the thickness of the granular bed and thebuoyancy number, i.e., the ratio of the stabilizing density contrast to thedestabilizing thermal density contrast.

Resuspension threshold of a granular bed by localized heating