Authors : Roger K. M. Rumbu

Volume/Issue : Volume 11 - 2026, Issue 8 - August

Google Scholar : https://tinyurl.com/mrypzbp6

Scribd : https://tinyurl.com/yep37bba

DOI : https://doi.org/10.38124/ijisrt/26aug293

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Abstract : This paper defines the dense and dilute domains represented by the Ergun and Wen-Yu drag correlations and examines the consequences of combining them through the classical Gidaspow switch in a bubbling fluidized-bed roaster. Its specific contribution is a reactor-resolved interpretive and validation framework that separates global fluidizationregime identification from local drag-closure selection and maps the resulting dense, dilute, and switching regions within the roaster. The review is extended with published particle-resolved data, a standard cold-flow benchmark, an original reactor-zone schematic, and quantitative sensitivity calculations. Published lattice-Boltzmann results indicate that an intermediate solids-fraction interval is not adequately represented by either limiting correlation, confirming that the conventional gas-volume-fraction threshold is a numerical selection rule rather than a physical phase boundary.

Keywords : Ergun; Wen-Yu; Gidaspow; Interphase Drag; Gas-Solid Fluidization; Bubbling Fluidized-Bed Roaster; LatticeBoltzmann Method; Minimum Fluidization; Model Validation; Start-Up Heating.

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