纳米流体液滴在铁板上蒸发的动力学研究

Kinetics Study on Evaporation of Nanofluidic Droplets on Iron

液滴蒸发过程中的动力学研究对提高喷墨打印、农药喷洒的质量具有一定指导作用,本工作采用角度仪对去离子水液滴和浓度为0.05%、粒径为10nm的氧化铝纳米流体液滴在30℃和40℃铁板上的蒸发过程进行了录像记录和比较,包括液滴蒸发过程中三相线、接触角、液滴轮廓随时间变化规律。实验结果表明加入纳米颗粒后液滴蒸发行为有明显不同:在蒸发的第一阶段三相线固着时间更长,三相线的粘滑运动次数减少。

The kinetic study in the process of droplet evaporation has a certain guiding effect on improving the quality of inkjet printing and pesticide spraying.In this work,the angled instrument was used to record and compare the evaporation process of deionized water droplets and droplets of alumina nanofluids with a concentration of 0.05%and particle size of 10 nm at 30℃and 40℃.It includes the variation of three-phase line,contact angle and droplet profile with time during droplet evaporation.The experimental results show that the droplet evaporation behavior is significantly different after the addition of nanoparticles:in the first stage of evaporation,the three-phase line fixation time is longer,and the number of stick-slip movements of the three-phase line is reduced.