Multi-Scale Modelling of Powder Dispersion in a Carrier-Based Inhalation System
Multi-Scale Modelling of Powder Dispersion in a Carrier-Based Inhalation System
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DOI：
10.1007/s11095-014-1601-2
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发表时间：
2014-12
影响因子：
3.7
通讯作者：
Z. Tong;H. Kamiya;A. Yu;H. Chan;Runyu Yang
中科院分区：
文献类型：
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作者：
Z. Tong;H. Kamiya;A. Yu;H. Chan;Runyu Yang
目的基于载体的干粉吸入器 (DPI) 广泛用于快速、方便地将药物输送到作用部位。本工作旨在通过数值建模来预测 DPI 中的粉末气雾化。方法开发了一种基于计算流体动力学 (CFD) 和离散元法 (DEM) 相结合的多尺度建模技术。结果不同冲击速度和角度下药物颗粒从单个载体上脱离的模拟结果与实验中测量的细颗粒分数 FPF 加载的结果相当。开发了经验方程将分离性能与冲击速度和冲击角度联系起来。然后模拟 Aerolizer® 中载体颗粒的动力学。结果表明，载体壁撞击是药物雾化性能的主要机制。通过将经验方程与载体壁冲击能量联系起来，预测表明，对于具有固定载体/药物比率的给定制剂质量，吸入器性能随着载体尺寸而下降，并随着空气流量而增加。然而，装置空效率与载体尺寸和流速无关。结论多尺度模型能够提供定量信息，以更好地理解基于载体的制剂的气雾化机制。
PurposeCarrier-based dry powder inhalers (DPIs) are widely used for rapid and convenient delivery of drug to the site of action. This work aimed to predict powder aerosolisation in DPIs through numerical modelling.MethodsA multi-scale modelling technique based on the combined computational fluid dynamics (CFD) and discrete element method (DEM) approach was developed.ResultsThe simulation results of the detachments of the drug particles from single carrier under different impact velocities and angles were comparable with those measured in the experiments in terms of fine particle fraction FPFloaded. Empirical equations were developed to link the detachment performance with impact velocity and impact angle. Then the dynamics of the carrier particles in Aerolizer® was simulated. The results indicated that the carrier-wall impaction was the dominant mechanism for drug aerosolisation performance. By linking the empirical equations with the carrier-wall impact energy, the predictions showed that for a given formulation mass with a fixed carrier/drug ratio, the inhaler performance decreased with carrier size and increased with air flow rate. Device empty efficiency, however, was independent with carrier size and flow rate.ConclusionsThe multi-scale model was able to provide quantitative information to better understand the aerosolisation mechanisms of carrier-based formulation.