Abstract
Nozzle geometric parameters are important to control the flow and deformation behaviors of printed filament. Choosing the right nozzle geometric parameters before the printing process is critical and requires considerable attention. In this study, nozzles with various geometric characteristics were designed and fabricated. Experiment and computational fluid dynamics (CFD) simulation were used to investigate the flow and deformation behaviour of printing ink via these nozzles. The results indicated that increasing of the area ratio of outlet to inlet AR (Aoutlet/Aintlet) and direction of material deposition θ will reduce the extrusion pressure. Changing the direction of material deposition θ is a critical means for controlling the printing pressure. Increasing of nozzle aspect ratio Ψ (Wn/Hn) and decreasing of direction of material deposition θ will reduces the deformation rate of deposited filament. This study may provide a theoretical guidance for the design and selection of nozzle before printing process.
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