摘要
考虑液滴与环境气流物性瞬态变化的单液滴非平衡蒸发,建立了模型,研究正十二烷液滴在含乙醇氛围中的对流蒸发过程,获得环境参数(环境温度、压力、对流强度、环境气体中乙醇蒸气和水蒸气质量分数)对液滴蒸发特性的影响规律.计算结果表明:环境因素中影响液滴蒸发的主要因素是环境温度、环境压力和对流强度,乙醇蒸气和水蒸气质量分数对液滴蒸发特性几乎没有影响;环境温度和对流强度的增加,有利于液滴蒸发;对初始温度较低的燃料液滴,环境压力对蒸发的影响与环境温度、气流相对速度相关;在一定的热环境参数下,压力效应发生逆转;增加液滴周围气体中乙醇蒸气质量分数和降低水蒸气质量分数,会加速液滴蒸发,液滴寿命略微缩短.
For a single n-dodecane droplet in different convective thermal environments, the evaporation characteristics were simulated by non-equilibrium evaporation model with the considerations of physical properties of droplet and ambient gas. The effects of the environment parameters of ambient pressure, temperature, convection intensity and C2HsOH （g）/H20 （g） concentration on the evaporation process were investigated. The results indicate that ambient pressure, temperature and convection intensity are the major effect factors on evaporation characteristics, but the mass fraction of C2H3OH（g）/H2O（g） has little effect on the droplet vaporization. The droplet evaporates faster with the increasing of ambient tem- perature and convection intensity. The effects of ambient pressure on droplet evaporation are significantly dependent on temperature and relative velocity of the ambient gas flow. The effect of pressure shows markedly different under weak convection and intensive convection conditions. The droplet lifetime is ap- preciably shortened with the increasing of mass fraction of C2H5OH （g） , but appreciably prolonged with the increasing of H2O（g） concentration.
出处
《江苏大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第5期508-513,共6页
Journal of Jiangsu University：Natural Science Edition
基金
国家自然科学基金资助项目(50976051)
江苏省研究生创新计划项目(CXZZ12_0675)
江苏高校优势学科建设工程项目(苏政办发[2011]6号)
关键词
正十二烷
液滴蒸发
对流环境
乙醇氛围
环境参数
n-dodecane
droplet evaporation
convective environment
alcohol mixture
environmentparameter
