This work presents an investigation of the perturbations induced by the bubbles in a 2-D fluidized bed. Acombination of Digital Image Analysis (DIA) and Particle Image Velocimetry (PIV) techniques was developed tocharacterize the dense and bubble phases. The analysis of the mean and the instantaneous fluctuations of thevelocity of the dense phase, together with the solid movement around bubbles, allowed for themeasurement ofthe influence region, distinguishing an upwardmoving dense phase in the nose and thewake of the bubble (drift)and a downward moving dense phase in the sides of the bubble.For an isolated bubble, we measured the drift area within the total influence region and related the size of theseregions to the equivalent diameter of the bubble. This work also presents results on the volumetric dissipation ofkinetic energy, wherewe concluded that the energy dissipation in the dense phase is proportional to the square of the bubble velocity
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