AI 中文总结
该研究针对传统扩散模型忽略花粉脱水形态的问题，通过CFD模拟揭示干燥与 hydrated 花粉颗粒的阻力、传热差异，指出需采用真实脱水形态建模气传过敏原输运。
AI 中文摘要
气传花粉输运是城市空气质量评估、过敏风险预测与智慧城市规划的关键关注点。然而，传统扩散模型通常假设颗粒为光滑球形，忽略花粉脱水改变颗粒形态并影响空气动力学与热行为的情况。为填补这一空白，本研究首次开展先进CFD模拟，评估真实脱水（干燥）花粉颗粒的空气动力学阻力与对流传热特性。研究在雷诺数（0.1 ≤ Reₚ ≤ 15）下进行，该颗粒尺度对应0.27至30 km/h的真实大气风速。研究结果显示，干燥花粉颗粒的阻力系数比 hydrated 花粉球形颗粒的预测值高8%至15%；相反，其努塞尔数比 hydrated 花粉颗粒低5%至15%。这些显著偏差证实，传统球形关联式不足以模拟干燥花粉的拉格朗日输运与蒸发过程。研究结果强调，在建模城市环境中气传过敏原输运时，需考虑真实脱水形态的影响。
英文摘要
Airborne pollen transport is a key concern for urban air-quality assessment, allergy-risk forecasting, and smart-city planning. However, conventional dispersion models generally assume smooth spherical particles, neglecting how pollen dehydration alters particle morphology and impacts aerodynamic and thermal behavior. To address this gap, this study presents, for the first time, advanced CFD simulations evaluating the aerodynamic drag forces and convective heat transfer of realistically dehydrated (dry) pollen particles. Investigations are conducted at Reynolds numbers ($0.1 \leq Re_p \leq 15$) at the particle's scale corresponding to realistic atmospheric wind speeds ranging from 0.27 to 30 km/h. The findings reveal that dry pollen particles exhibit drag coefficients 8% to 15% higher than those predicted for hydrated pollen spherical particles. Conversely, their Nusselt numbers are 5% to 15% lower than those for hydrated pollen particles. These considerable deviations confirm that conventional spherical correlations are inadequate for simulating dry pollen Lagrangian transport and evaporation. These findings highlight the need to account for realistic dehydrated shapes when modeling airborne allergen transport in urban environments.
