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13th Spring School on Transition and Turbulence
ASSESSING THE SIZE AND POSITION OF PARTICLE CLUSTERS IN THE GAS-SOLID FLOW OF A CFB RISER USING HIGH-SPEED IMAGING AND IMAGE ANALYSIS
Vivien Rossbach , SC
Co-Authors: Vivien Rossbach, Sarah Laysa Becker, Vinicius Vale, Denise Bahr, Henry França Meier, Dirceu Noriler
Presenter: Vinicius Vale
In turbulent gas-solid systems, the development of clusters of solid particles reduces the efficiency of the gas-solid contact, as the clusters have a larger size and a smaller void fraction than the individual dispersed particles. Experimental measurement of cluster size is very difficult because of the fast changes in the flow velocity and concentration. However, the size of a cluster can be estimated through high-quality images taken at minor intervals or through numerical simulations, according to the literature. This study aims to estimate, from high-speed imaging, the size and position of the particle clusters in the gas-solid flow of a pilot-scale CFB riser. Through images with high resolution obtained during 8 s, the size and average position of particle clusters in the inlet region of the riser were estimated under different operating conditions.
Gas-solid flow, HIgh Speed Imaging, CFB riser