Computational model for prediction of particle degradation during dilute-phase pneumatic conveying: modeling of dilute-phase pneumatic conveying

摘要

A complete model of particle impact degradation during dilute-phase pneumatic conveying is developed,which combines a degradation model,based on the experimental determination of breakage matrices,and a physical model of solids and gas flow in the pipeline.The solids flow in a straight pipe element is represented by a model consisting of two zones: a strand-type flow zone immediately downstream of a bend,followed by a fully suspended flow region after dispersion of the strand.The breakage matrices constructed from data on 90° angle single-impact tests are shown to give a good representation of the degradation occurring in a pipe bend of 90° angle.Numerical results are presented for degradation of granulated sugar in a large scale pneumatic conveyor.