2026-10-13T19:09:21Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34036602 2026-09-30T18:13:36Z category_1 category_146 category_7 category_21 category_734 category_132 portal_63 item_type_6 month_year_09_2026

Regulating Gas–Solid Fluidization in a Diameter-Transformed Dense Bed with Geldart A Particles José I. Bielma (25145544) Mengmeng Cui (424742) Juan M. Colom (2854121) Isa Al Aslani (25145547) Diego Zapater (12461825) Rubén Medina Flores (25145550) Lujain Alfilfil (5727923) Isidoro Morales Osorio (25145553) Mohammed Hakami (21320378) Khalid Almajnouni (15502199) Jorge Gascon (1474357) Pedro Castaño (6953906) Biophysics Space Science Medicine Biotechnology Biological Sciences not elsewhere classified Infectious Diseases various operating conditions residence time distribution numerical models used transformed dense bed chaotic flow patterns local solids holdup transformed structures flow testing validated model transported risers solid flux predictive capability particularly pronounced integrates cold highly heterogeneous experimental observations evaluate hydrodynamics e ., drop measurements cpfd simulations bottom section 2d systems 2 kg Scaling and optimizing dense fluidized bed reactors remain challenging because gas–solid interactions are complex and highly heterogeneous, most experimental observations are limited to pseudo-2D systems, and validating the numerical models used for design is difficult. This challenge is particularly pronounced for geometries with diameter-transformed structures (i.e., the bottom section of transported risers and two- and multizone fluidized bed reactors) and for Geldart A solids, whose fine particle size and cohesive behavior produce complex, chaotic flow patterns. In this work, we developed an approach that integrates cold-flow testing with CPFD simulations to regulate gas–solid fluidization in a 3D diameter-transformed dense fluidized bed reactor. We modified the Ergun-based drag model using pressure-drop measurements and implemented it in CPFD simulations. The model accurately reproduces experimental pressure drop and local solids holdup in a dense bed reactor containing 1.2 kg of Geldart A particles, demonstrating its predictive capability. We employed the validated model to evaluate hydrodynamics (i.e., void fraction, solid flux, and residence time distribution) under various operating conditions, enabling flexible application across different reactions. 2026-09-30T00:00:00Z Text Journal contribution 10.1021/acsengineeringau.6c00058.s001 https://figshare.com/articles/journal_contribution/Regulating_Gas_Solid_Fluidization_in_a_Diameter-Transformed_Dense_Bed_with_Geldart_A_Particles/34036602 CC BY-NC 4.0