Bed collapse and expansion characteristics of multi-walled carbon nanotubes in fluidized beds
| Autor: | Dong Hyun Lee, Sung Woo Jeong |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Gas velocity General Chemical Engineering Collapse (topology) 02 engineering and technology Carbon nanotube 021001 nanoscience & nanotechnology law.invention symbols.namesake 020401 chemical engineering Mechanics of Materials Fluidized bed law Phase (matter) symbols Particle Fluidization 0204 chemical engineering Composite material van der Waals force 0210 nano-technology |
| Zdroj: | Advanced Powder Technology. 29:751-755 |
| ISSN: | 0921-8831 |
| DOI: | 10.1016/j.apt.2017.12.017 |
| Popis: | The objective of this study was to investigate bed collapse and expansion characteristics of different types of multi-walled carbon nanotubes (MWCNTs) in fluidized bed with a 0.14 m-ID × 2.4 m-height Plexiglas column. Three types of MWCNTs were used as bed materials: (i) N, NC7000™ prepared by Nanocyl®, (ii) Sf, fine entangled MWCNTs agglomerated by strong cohesive force such as van der Waals force, (iii) Sc, coarse entangled MWCNTs with a single particle. Similarity between MWCNTs and Geldart group particles was investigated based on bed collapsing process. Results showed that bed collapsing processes of N, Sf, and Sc were similar to those of Geldart groups A, C, and B particles, respectively. Based on bed collapse and expansion characteristics, dense phase voidages of N and Sf were 0.795 and 0.921, respectively, in bubbling fluidization at superficial gas velocity of 0.19 m/s. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect