# Separation of Flexible Rod-like Particle Mixtures by Intersecting Air Flow

## TL;DR

This paper studies how flexible rod-like particles, such as biomass materials, can be separated using intersecting air flow in a separator.

## Contribution

The study introduces a numerical model combining DEM and CFD to analyze and optimize the separation of flexible rod-like particles.

## Key findings

- Lighter particles are horizontally blown while heavier ones fall, enabling segregation.
- Parameters like air velocity and packing density significantly influence separation efficiency.
- A geometric suggestion is proposed to enhance particle segregation in the separator.

## Abstract

Air-induced separation of flexible rod-like particle mixtures in a specific separator is numerically investigated using a coupled Discrete Element Method (DEM) and Computational Fluid Dynamics (CFD) approach. In the separator, the mixture of flexible rod-like particles of different lengths and material densities deposits under the effect of gravity, and a horizontal airflow stream intersects the particle flow, blowing lighter particles in the mixture to translate horizontally and allowing the heavier ones to fall downwards. The model particles represent flexible biomass materials, specifically tobacco and stem particles. The initial packing density of the particle mixture is 8% by volume. The physical mechanism that causes particle segregation is analyzed. Subsequently, parametric studies are performed to examine the effects of some critical parameters on the extent of segregation, including inflow air velocities, initial particle packing density, volume fraction of heavier particles, particle size distribution, and flow field geometry. Finally, a suggestion is proposed to promote particle segregation in such a type of separator.