- Title
- Estimation of dispersion coefficient in a solid-liquid fluidised bed system
- Creator
- Khan, Md. Shakhaoath; Karim, Ifsana; Evans, Geoffrey M.; Doroodchi, Elham; Joshi, Jyeshtharaj B.; Mitra, Subhasish
- Relation
- Powder Technology Vol. 374, Issue September 2020, p. 560-576
- Publisher Link
- http://dx.doi.org/10.1016/j.powtec.2020.07.064
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2020
- Description
- Particle dispersion behaviour in a solid liquid fluidised system leads to interesting outcomes such as mixing and segregation which are often quantified by an empirical dispersion coefficient. The present study aims at providing a better estimation of particle dispersion behaviour from a fundamental definition analogous to diffusion coefficient. By tracking a tracer particle using high speed image analysis, fluctuating velocity components (Vi/) were determined in a solid-liquid fluidised bed comprising glass particles (dS = 8 mm, ρS = 2230 kg m−3) and water as a fluidising medium. Both inter-particle and particle-wall collisions were determined from the time varying jerk data. The particle mean-free path (λ) was then estimated as a distance between two successive peaks in the jerk profile. Finally, dispersion efficient D was computed based on the product of λ and V. Estimated dispersion coefficients were compared with the available correlations and reasonable agreement was obtained.
- Subject
- fluidised bed; dispersion coefficient; velocity distribution; mean free path; jerk; particle collision
- Identifier
- http://hdl.handle.net/1959.13/1464938
- Identifier
- uon:47153
- Identifier
- ISSN:0032-5910
- Language
- eng
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