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Simulations of Liquid Spreading and Particle Aggregation in Gas-Fluidized Beds
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- Author / Creator
- Wasylkiewicz, Monika J
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Introduction of a binding or reacting liquid into a gas-solid fluidized bed is
common in industrial processes (e.g. fluid coking, catalytic cracking, granulation).
Ability of the liquid to spread and the attractive effect on particles due to liquid
bridge formation alter the fluidization behavior and process efficiency.
Direct numerical simulations are performed using the lattice-Boltzmann method, with liquid modeled as a scalar transferred during particle collisions. A liquid spreading model is introduced based on a liquid bridge growth rate, and liquid
spreading is studied and analyzed in terms of diffusion coefficients. Then, a system
of homogeneously wetted particles is simulated, with an attractive force applied between adjacent particles. Aggregate sizes and fluidization behavior are examined. Liquid diffusion is slower horizontally than vertically. The relation between liquid spreading and solids volume fraction depends on liquid viscosity and surface tension. Systems simulated generally completely aggregate, with aggregation resulting in slip velocity increases. -
- Subjects / Keywords
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- Graduation date
- Spring 2014
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.