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Characterization of the bubbling fluidization of nanoparticles

Particuology 2014年第5期12卷 75-83页

作者： mohammad r.tamadondar reza Zarghami Maryam Tahmasebpoor Navid Mostoufi Multiphase Systems research Lab. Oil and Gas Processing Centre of ExcellenceSchool of Chemical EngineeringCollege of EngineeringUniversity of TehranP.O.Box 11155/4563Tehran.Iran

The dynamic features of an agglomerate bubbling fluidization of nanoparticles were investigated through the analysis of pressure fluctuations. Experiments were carried out in a lab-scale fluidized bed at ambient conditions using 10-15 nm silica nanoparticles without any surface modification. Pressure fluctuation signals were processed in both frequency and time-frequency domains to characterize the behavior of various scales of phenomena （i.e.. macro-, meso-, and micro-structures） during fluidization. Due to the aggregation of nanoparticles, three separate broad peaks were observed in the frequency spectra of the pressure signals measured in the bubbling fluidized bed of nanoparticles. A non-intrusive method based on the decoupling of pressure fluctuations recorded simultaneously in the plenum and in the bed was used to determine the approximate size of the bubbles in the bed.

关键词： Fluidization Hydrodynamics Pressure fluctuations Nanoparticles

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Using S-statistic for investigating the effect of temperature on hydrodynamics of gas-solid fluidization

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Particuology 2013年第3期11卷 288-293页

作者： mohammad reza tamadondar reza Zarghami Hedayat Azizpour Navid Mostoufi Jamal Chaouki ramin radmanesh Multiphase Systems research Lab. Oil and Gas Processing Centre of ExcellenceSchool of Chemical EngineeringCollege of EngineeringUniversity of Tehran Department of Chemical Engineering Ecole Polytechnique de Montreal

The influence of temperature on fluidization was investigated by a statistical chaotic attractor comparison test known as S-statistic, After calibration of the variables used in this method, the S-test was applied to the radioactive particle tracking （rPT） data obtained from a lab-scale fluidized bed. Experiments were performed with sand as fluidized particles and in temperatures from ambient up to 600 ℃ with superficial gas velocities of 0.29, 0.38 and 0.52 m/s. Considering the behavior of bubbles and comparing with frequency domain analysis, it was concluded that S-statistic is a reliable method for characterization of fluidization process behavior at different temperatures.

关键词： S-statisticEffect of temperatureParticle trajectoryFluidized bed

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