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Partic. vol. 34 pp. 48-60 (October 2017)
doi: 10.1016/j.partic.2016.11.005

An advanced evaluation of the mechanistic scale-up methodology of gas–solid spouted beds using radioactive particle tracking

Neven Alia, Thaar Al-Juwayaa, Muthanna Al-Dahhana, b, *

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    • The new scale-up methodology for gas–solid spouted beds is based on matching gas holdup profile. • The methodology was evaluated using radioactive particle tracking technique. • Two sizes of spouted beds with conditions of similar and dissimilar gas holdup profiles were used. • The results of the solids flow fields demonstrated the validity of the new scale-up method. • The results may be useful for being used as benchmarking data and validation of CFD models.


We implemented for the first time our radioactive particle tracking as an advanced noninvasive technique to further evaluate and validate our newly developed mechanistic scale-up methodology based on matching the radial profile of the gas holdup. Two spouted beds with diameters of 0.076 and 0.152 m were used. Three sets of conditions were implemented; i.e., conditions of the reference case, conditions that provided a gas-holdup radial profile similar to that of the reference case, and conditions that provided a gas-holdup radial profile dissimilar to that of the reference case. The results confirm the validation of the scale-up methodology in terms of obtaining closer dimensionless values and radial profiles of components of the particle velocity, normal stress, shear stress, and turbulent kinetic energy. The results further advance the understanding of gas–solids spouted beds, provide deeper insight into the solids dynamics of the beds and present important benchmarking data for validating computational fluid dynamics codes and models.

Graphical abstract


Scaling up; Spouted bed; Tristructural-isotropic particle; Radioactive particle tracking; Three-dimensional velocity field; Turbulence