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Swirling flow and capillary diameter effect on the performance of an active dry powder inhalers.
Med. Nov. Techn. Dev. 18:100240 (2023)
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) was applied to simulate the problem. The results were compared with previous in vitro and numerical studies to validate the results. Based on the derived results, the small swirl parameter (SP) enhances the secondary flow and recirculation zone. It increases the central jet flow, which increases the ED value by about 5–20% compared to no-swirl flow. However, as the airflow rate increases, the recirculation zone enlarges, vorticities become dominant, and asymmetrical flow patterns emerge. Consequently, ED % drops significantly (more than 50%). As dc_out decreases, the vorticities around the outlet capillary become more potent, which is undesirable. Indeed, the emptying of the capsule does not happen ideally. The research provides a perspective on the device's design and DPI performance.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Computational Fluid Dynamics ; Dry Powder Inhalers ; Swirling Flow
ISSN (print) / ISBN
2590-0935
e-ISSN
2590-0935
Quellenangaben
Volume: 18,
Article Number: 100240
Publisher
Elsevier
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institute of Computational Biology (ICB)