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For patients with lung disease, dry powder inhalers (DPI) are profoundly beneficial. The current study introduces and develops a series of dry powder inhalers (DPIs). A capsule-based (size 0) active DPI was considered. The study aims to investigate whether swirling flow and outlet capillary diameter (dc_out) affect the percentage of emitted doses (ED) released from the capsule. Spiral vanes were added to the capillary inlet to produce a swirling flow. Computational fluid dynamics (CFD) wasdoi:10.21203/rs.3.rs-2395781/v1 fatcat:bria7maglzaozocdemeac3vyqe