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Three-dimensional dynamic characterization of square-nosed slugging phenomena in a fluidized bed

Particuology 2022年第8期20卷 35-46页

作者： yaswanth pottimurthy Dawei Wang Cody Park Shalin Patil Andrew Tong Liang-Shih Fan Willam G.Lowrie Department of Chermical and Biomolecular Engineering.The Ohio State Univrsity ColumbusOH 43210USA

Slugging represents one of the major regimes in fluidization,which occurs in small diameter beds with large bed height-to-diameter ratio or in large diameter beds with internals that resemble multiple small diameter fluidized *** types include round-nosed slug,wall slug and square nosed *** of the slugs have been mainly focused on round-nosed or wall slugs known as half *** occurring in Geldart group A particle *** square-nosed slug typically occurring for Geldart group D particles appears to be regarded as simple in its *** Electrical Capacitance Volume Tomogra phy(ECVT)imaging of the square-nosed slugging phenomena conducted in this study reveals *** is the structure of the square nosed slug is,in fact,complex,particularly with respect to its dynamic variation in *** *** study examines experimentally the hydrodynamic character-istics of the square-nosed fluidization ***,simultaneous measurements from multiple ECVT sensors provide non-inv asive,continuous,*** imaging of the entire flow region of the slugging bed and hence enabling the dynamic characterization of the evolution of the *** analysis of the 3D images reconstructed for real time gas-solid volume fraction profile of the slugging fluidized bed indicates that there are three different *** bottom fluidization zone,the gas slug zone,and the solid slug zone,co-existing in the *** three zones present different hydrodynamic characteristics during the slug *** is found that varying the gas velocity of the slugging bed mainly varies the maximum length of the gas slug zone,while it only has a minor effect on the lengths of the bottom fluidization zone and solid slug *** also has an insignificant efect on the solid volume fraction of the three zones.

关键词： Gas-solid flow Fluidized bed Square-nosed slugging Electrical Capacitance Volume Tomography

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