华中科技大学学报（自然科学版）2025，Vol.53Issue(7)：94-100,7.DOI:10.13245/j.hust.250395
莱登弗罗斯特氮液滴撞击壁面数值模拟研究
Numerical study on nitrogen droplets impacting surface at leidenfrost states
摘要
Abstract
The dynamics and thermodynamic characteristics of liquid nitrogen droplets impacting a superheated wall were investigated using numerical simulation methods.The findings show that when Leidenfrost effect occurs,the liquid nitrogen droplet impacting the superheated wall surface mainly undergoes three phases:spreading,retraction and rebound.The rebounding stage can be further divided into three sub-processes:levitation,suspension,and descendance.These behaviors are closely related to the pressure-velocity profiles inside the droplet.When film boiling occurs,a vapor film is formed between the droplet and the wall,which deteriorates heat transfer and results in distinct variations in heat flux over time.The evaporation rate of the droplet exhibits a trend of increasing,decreasing,increasing again,and decreasing again until it reaches 0 mm3/ms throughout the process of spreading,retracting and rebounding.The overall evaporation ratio during the impact is less than 0.65%.The morphological evolution of liquid nitrogen droplets is accompanied by the conversion of energy forms.During spreading,the kinetic and potential energy of the droplet is almost fully converted into surface energy in addition to viscous dissipation;during radial retraction,the surface energy is converted into kinetic energy;during axial stretching,the kinetic energy is converted into potential energy;and during rebound,the kinetic and potential energy of the droplet is converted to each other.关键词
液氮液滴/过热壁面/数值模拟/能量转化/热流密度Key words
liquid nitrogen droplets/overheated surface/numerical simulations/energy conversion/heat flux density分类
数理科学引用本文复制引用
李亚楠,刘秀芳,苗庆硕,侯予..莱登弗罗斯特氮液滴撞击壁面数值模拟研究[J].华中科技大学学报（自然科学版）,2025,53(7):94-100,7.基金项目
国家自然科学基金资助项目(52076164) （52076164）
国家科技重大专项资助项目(J2019-Ⅲ-0010-0054) （J2019-Ⅲ-0010-0054）
结冰与防除冰重点实验室开放课题资助项目(IADL20220107). （IADL20220107）
