高校化学工程学报2025，Vol.39Issue(5)：833-844,12.DOI:10.3969/j.issn.1003-9015.2025.05.006
高黏度低表面张力液滴撞击粗糙壁面的动力学行为分析
Dynamic behaviors of high-viscosity droplets with low surface tension impacting on rough surfaces
摘要
Abstract
The dynamic behavior of heavy oil droplets impacting surfaces is a pivotal issue in understanding the car-bonaceous deposition process on the outer surface of the vortex finder in catalytic cracking cyclone separators.To minimize the effects of carbonaceous deposition on the wall of the vortex finder due to the impact of heavy oil drop-lets,in this study,we focused on glycerol-ethanol solutions,which exhibit similar physical properties to heavy oil droplets(high viscosity and low surface tension)at high temperatures.By integrating high-speed imaging technology with numerical simulations,we investigated the wall-impact behavior of these droplets.Consequently,we developed a mathematical model to predict the outcomes of droplet collisions with wall surfaces.The results indicated that sur-face characteristics and droplet properties had a minor effect on the initial stage of the droplet impact process.As the impact process progresses,the droplet spreading coefficient decreases with increasing surface roughness.The contact angle formed between a high viscosity and low surface tension droplets and a surface with excellent wettabili-ty is smaller,indicating that the droplet exhibits stronger spreading performance and tends to adhere closely to the surface.The oil hydrophobic property of the surface can be improved by appropriately reducing the cantilever length of the surface microstructure.By introducing dimensionless parameters,a predictive model for the critical condition of droplet splashing on rough and dry surfaces Wec=667.12·Oh(Ra/D0)-0.75 is established.This model can effec-tively predict the splashing behavior of high-viscosity,low-surface-tension droplets on rough and dry surfaces.The research results provide a theoretical reference for analyzing the interaction mechanism between heavy oil droplets and wall surfaces.关键词
液滴碰撞/粗糙壁面/低表面张力/重油液滴/升气管结焦/CLSVOF方法Key words
droplet impacting/rough surface/low surface tension/heavy oil droplet/vortex finder carbo-naceous deposition/CLSVOF method分类
石油、天然气工程引用本文复制引用
宋健斐,丁续,刘佶,魏芳蓉..高黏度低表面张力液滴撞击粗糙壁面的动力学行为分析[J].高校化学工程学报,2025,39(5):833-844,12.基金项目
国家自然科学基金(22178382). （22178382）
