Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
PATTERNS FORMED ON BI-DISPERSED SOLID-LIQUID FLUIDIZED BEDS IN NARROW TUBES
Submission Author:
Fernando David Cúñez , SP
Co-Authors:
Fernando David Cúñez, Erick de Moraes Franklin
Presenter: Fernando David Cúñez
doi://10.26678/ABCM.ENCIT2018.CIT18-0734
Abstract
In this paper, the patterns formed on bi-dispersed liquid-solid fluidized beds were experimentally investigated. The fluidized beds are formed in a 25.4 mm-ID tube and consisted of alumina beads with 6mm diameter and aluminum beads with 4.762mm diameter, with a specific gravity of 3.69 and 2.76, respectively; therefore, the ratio between the spheres and the tube is between 4.23 to 5.33. The experiments were developed with two water flow rates corresponding to mean cross-sectional velocities of U = 0.137 and 0.164m/s, and six different arrangements of beds were used. With these conditions, it was possible to observe the formation of transverse waves, in the form of granular plugs (for alumina beads), and in the form of granular clusters (for aluminum beads), that propagate with characteristic lengths and celerities. The fluidized beds were filmed with a high-speed camera, and the images were processed by using numerical codes in order to automatically identify and track the formed patterns.
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