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Numerical Study on Particle Adhesion in Dry Powder Inhaler Device.
Ryosuke Mitani1, Shuji Ohsaki1, Hideya Nakamura1
1Department of Chemical Engineering, Osaka Prefecture University.
Chemical & Pharmaceutical Bulletin
|August 4, 2020
Summary
Vortex flows in dry powder inhaler (DPI) capsules reduce particle adhesion. Modifying the capsule to enhance these flows significantly decreased residual particles, improving DPI efficiency.
Area of Science:
- Pharmaceutical Engineering
- Computational Fluid Dynamics
- Particle Science
Background:
- Particle adhesion in dry powder inhalers (DPIs) affects drug delivery efficiency.
- Understanding particle-capsule interactions is crucial for optimizing DPI performance.
Purpose of the Study:
- To investigate the particle adhesion mechanism within a DPI capsule.
- To identify factors influencing residual particle behavior.
- To explore capsule modifications for enhanced particle delivery.
Main Methods:
- Combined computational fluid dynamics (CFD) and discrete element method (DEM) simulations.
- Utilized the Johnson-Kendall-Roberts (JKR) theory for adhesion force modeling.
- Compared particle behavior in original and modified capsule designs.
Main Results:
- Simulation results matched experimental observations of particle distribution.
- Vortex flows were identified at the capsule outlet, correlating with higher particle collisions and adhesion.
- Modified capsule design, enhancing vortex flow, reduced residual particles.
Conclusions:
- Vortex flows play a critical role in minimizing residual particles within DPI capsules.
- The CFD-DEM approach is a valuable tool for analyzing particle adhesion mechanisms.
- Capsule design modifications can significantly improve DPI delivery efficiency.
