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Abstract
The present paper is Part III of a series of papers dealing with the air‐flow inside the transport duct of a DREF‐III friction spinning machine. The design of the transport duct used in a DREF‐III friction spinning machine has been modified and improved. The air‐flow analysis inside the transport duct was carried out using the computational fluid dynamics (CFD) software FLUENT after creating the transport duct geometry in the geometrical model software ‘GAMBIT’. The boundary conditions namely inlet, outlet, moving wall and wall were specified for the transport duct in GAMBIT and were then exported to FLUENT, where the pressure and velocity values were specified. The simulations were then done using k‐ϵ model for turbulent flow. FLUENT solves the basic fluid dynamics equations namely the energy and momentum equations along with the additional equations. Air‐flow behaviour has been simulated in the various modelled modified transport ducts. Slots were created near the inlet and they were given an inclined profile in order to reduce the reverse flow by guiding the air‐flow. The transport duct with one pair of slots at 30° angle was finally selected based on techno‐economic aspects. The physical properties of finer and coarser count yarns made from the modified as well as the conventional transport duct were compared for assessing the enhancement of properties with transport duct modification.