【摘要】 通过数值方法研究了正十二烷单液滴蒸发过程。在Fick扩散定律的基础上,增加斯蒂芬流对气液界面传质的影响,建立了新的液滴蒸发率模型。通过耦合Volume Of Fluid(VOF)气液两相模型,实现对液滴蒸发过程中气液两相自由表面的捕捉。利用正十二烷单组份液滴蒸发实验数据,对比分析了热电偶丝导热效应对液滴蒸发的影响。同时研究了不同初始液滴温度和不同环境温度对正十二烷液滴蒸发的影响。结果表明,热电偶丝导热效应能够显著增大液滴平衡温度,加快液滴蒸发过程。液滴的初始温度对最终平衡温度影响不大,而液滴瞬态加热阶段随着初始液滴温度的增加而缩短。环境温度越高,液滴最终平衡温度随之增加,液滴存在时间缩短。更多还原

【Abstract】 A numerical evaporation model for single dodecane droplet evaporation is presented and validated by experiment data.The effect of stefan flow is implemented to the evaporation model which is based on Fick law.The evaporation model is solved numerically together with the VOF methodology for tracking the droplet interface.The study investigated the effects of the additional thermal conductivity caused by suspension and initial droplet temperature on droplet evaporation.The results show that the effect of additional thermal conductivity can significantly accelerate the droplet evaporation process,increase the droplet equilibrium temperature.The study also investigated the ambient temperature and initial droplet tempera-ture on droplet evaporation.The initial droplet temperature has little effect on the droplet equilibrium temperature,while the transient heating process decreases with the increase of the initial droplet tempera-ture.The higher ambient temperature,the higher droplet equilibrium temperature.And the evaporation process is faster.更多还原