Heat and Mass Transfer, Journal Year: 2024, Volume and Issue: 61(1)

Published: Dec. 9, 2024

Abstract Particle-resolved simulations have been performed to study the pyrolysis process of a high-density polyethylene (HDPE) particle in an inert hot nitrogen flow. The resolve velocity and temperature boundary layers around particle, as well gradients concentration within particle. objective this work is gain in-depth understanding effect morphology-specifically, size shape-on interplay between heat transfer progress, assess applicable when using Lagrangian concept for simulating plastic pyrolysis. In all simulation cases, reaction initiated at external surface where heated fastest. front propagates inward toward core until it fully pyrolyzed. For diameters larger than 4 mm, distinct can be detected, leading difference more 10 K case, yield considerably slower conversion compared with particle-resolved simulations. Moreover, cylindrical longitudinal flow has found pyrolyzed slowly spherical shell-shaped particles, which attributed enhanced conditions results reveal importance considering morphology modeling addition, approach, assumes homogeneity, only smaller 2 mm

Language: Английский