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Self-Diffusion in a Gas-Fluidized Bed of Fine Powder


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Opened Access Self-Diffusion in a Gas-Fluidized Bed of Fine Powder

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Author: Valverde Millán, José Manuel
Castellanos Mata, Antonio
Sánchez Quintanilla, Miguel Angel
Department: Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo
Date: 2001
Published in: Physical review letters, 81, 14, 3020-3023
Document type: Article
Abstract: We have investigated the self-diffusion in a stable gas-fluidized bed of fine powder. Two regimes have been observed: for gas velocities yg above the minimum fluidization velocity ym and below a critical gas velocity yc smaller than the minimum bubbling velocity yb the powder does not mix. Experimental measurements show the existence of yield stresses in this regime which are responsible for the static behavior of the bed. For yg . yc the yield stress vanishes; the bed behaves like a fluid and displays a diffusive dynamics. In this region we have found that the diffusion coefficient D increases with gas velocity until the bed expansion approaches its maximum value.
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DOI: 10.1103/PhysRevLett.86.3020

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