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EFFECTS OF gas type AND TEMPERATURE ON FINE PARTICLE FLUIDIZATION

Particuology 2006年第Z1期 114-121页

作者： Chunbao Xu1,* and J.-X. Zhu2 1Department of Chemical Engineering, Lakehead University, Thunder Bay, Ontario, P7B 5E1, Canada 2Powder Technology Research Centre, Department of Chemical & Biochemical Engineering, The University of Western Ontario, London, Ontario, N6A 5B9, Canada

The influence of gas type (helium and argon) and bed temperature (77?473 K) on the fluidization behav- iour of Geldart groups C and A particles was investigated. For both types of particles tested, i.e., Al2O3 (4.8 μm) and glass beads (39 μm), the fluidization quality in different gases shows the following priority sequence: Ar > He. In the same gaseous atmosphere, the particles when fluidized at an elevated temperature usually show larger bed voidages, higher bed pressure drops, and a lower umf for the group A powder, all indicating an enhancement in fluidization quality. Possible mechanisms governing the operations of gas type and temperature in influencing the fluidization behaviours of fine par- ticles have been discussed with respect to the changes in both gas properties and interparticle forces (on the basis of the London-van der Waals theory). gas viscosity (varying significantly with gas-type and temperature) proves to be the key parameter that influences the bed pressure drops and umf in fluidization of fine particles, while the interparticle forces (also varying with gas-type and temperature) may play an important role in fine-particle fluidization by affecting the ex- pansion behaviour of the particle-bed.

关键词： fluidization fine particles gas type temperature interparticle forces

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EFFECTS OF gas type AND TEMPERATURE ON FINE PARTICLE FLUIDIZATION

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China Particuology 2006年第3期4卷 114-121页

作者： Chunbao Xu J.-X. Zhu Department of Chemical Engineering Lakehead University Thunder Bay Ontario P7B 5E1 Canada powder Technology Research Centre Department of Chemical & Biochemical Engineering The University of Western Ontario London Ontario N6A 5B9 Canada

The influence of gas type （helium and argon） and bed temperature （77-473 K） on the fluidization behaviour of Geldart groups C and A particles was investigated. For both types of particles tested, i.e., Al2O3 （4.8μm） and glass beads （39 μm）, the fluidization quality in different gases shows the following priority sequence： Ar 〉 He. In the same gaseous atmosphere, the particles when fluidized at an elevated temperature usually show larger bed voidages, higher bed pressure drops, and a lower Umf for the group A powder, all indicating an enhancement in fluidization quality. Possible mechanisms governing the operations of gas type and temperature in influencing the fluidization behaviours of fine particles have been discussed with respect to the changes in both gas properties and interparticle forces （on the basis of the London-van der Waals theory）. gas viscosity （varying significantly with gas-type and temperature） proves to be the key parameter that influences the bed pressure drops and Umf in fluidization of fine particles, while the interparticle forces （also varying with gas-type and temperature） may play an important role in fine-particle fluidization by affecting the expansion behaviour of the particle-bed.

关键词： fluidization fine particles gas type temperature interparticle forces

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Pressure ranges of velocity splitting of ablated particles produced by pulsed laser deposition in different inert gases

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Chinese Physics B 2013年第8期22卷 519-522页

作者：丁学成王英龙褚立志邓泽超梁伟华傅广生 College of Physics Science and Technology Hebei University

The transport of ablated particles produced by single pulsed-laser ablation is simulated via Monte Carlo method. The pressure ranges of velocity splitting of ablated particles in different inert gases are investigated. The result shows that the range of velocity splitting decreases with the atomic mass of the ambient gas increasing. The ambient gas whose atomic mass is more than that of Kr cannot induce the velocity splitting of ablated particles. The results are explained by the underdamping model and the inertia flow model.

关键词： ablated particles pressure ranges velocity splitting gas type

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