The pneumatic conveyance of fibres within confined channels has been widely applied in textile engineering applications such as the transport of individual fibres within a transfer channel of rotor spinning machines due to its high speed, a reduced possibility for fibre damage during the processing and high efficiency. However, due to the sudden variation in the cross-sectional dimensions at the inlet to the transfer channel, recirculation zone(s) occurs at one, or both sides of the channel dependent on the channel dimensional and operational parameters, leading to the reduction of effective width suitable for the transport of fibres. Since fibres are a flexible material, their computational simulation is difficult because of the limitations of existing computing resources and the specific problems associated with modelling materials' characteristics. In order to deal with those, a two-dimensional flexible fibre model was introduced and fibre configurations were effectively and economically simulated with a Lagrangian one way coupling model based on the air flow patterns obtained. The effect of circulation zones on fibre configuration during transferring within the channel was specifically investigated.

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