Dynamic behavior of straw biomass particles in gas flow: A novel motion model and experimental validation.

This article focuses on the development and validation of a novel motion model for non-spherical, cylindrical straw biomass particles in gas-solid two-phase flows, particularly relevant to biomass co-firing in coal-fired boilers. Integrating advanced drag, lift, and torque coefficients derived from particle-resolved direct numerical simulations (PR-DNS) into a computational fluid dynamics-discrete element method (CFD-DEM) framework, the model captures the coupled translational and rotational dynamics of particles with aspect ratios (Ar) of 6, 10, and 15. Experimental validation using a visualized gas-solid flow system and high-speed imaging demonstrated that the model predicts particle trajectories, incident angles, and angular velocities with relative errors generally below 5–8%, confirming its accuracy and applicability. The study highlights that increasing particle aspect ratio intensifies aerodynamic forces and torque, leading to more complex rotational behavior, and suggests the model as a robust tool for optimizing biomass particle transport and combustion processes in industrial settings.