摘要
基于椭球模型,模拟了不同基板温度条件下超疏水表面上固着纯水液滴的蒸发过程,探究了蒸发过程中液滴蒸发时间、接触角演变行为、液滴表面温度和蒸发速率等参量。结果表明:基板温度越高,液滴蒸发寿命越短,且蒸发时间随基板温度呈线性关系。液滴蒸发过程中,接触角随蒸发时间成非线性变化。因较大的高径比和较小的热扩散率,基板温度对液滴蒸发初始阶段影响较小。近接触线区域液滴表面温度梯度较大,其他区域温度梯度较小;且基板温度越高,除近接触线区域液滴表面温差越小,这说明蒸发冷却效应受到了抑制。同一体积条件下,基板温度越高,液滴蒸发速率越大,且蒸发速率随基板温度呈指数变化。
The evaporation process of the sessile water droplet was investigated on superhydrophobic surface which numerically based on the ellipsoid cap model with different substrate temperature.The droplet evaporation time,contact angle evolution,evaporation rate and surface temperature were discussed.The results indicate that the higher the substrate temperature,the shorter the droplet evaporation life.The evaporation time of the droplet is linear with the substrate temperature.The evolution of contact angle is nonlinearly with the evaporation life during the process of droplet evaporation.The substrate temperature has little effect at the initial stage of droplet evaporation due to the larger aspect ratio and the smaller thermal diffusivity.Nearly contact line,the gradient of the substrate temperature is larger nevertheless it is smaller on the other region.Similarly,besides on nearly contact line area,the higher substrate temperature,the smaller temperature difference of the droplet surface.It is indicated that the evaporative cooling effect is suppressed.The higher the substrate temperature is,the bigger evaporation rate of the droplet with the substrate temperature under the same volume condition is.Meanwhile the evaporation rate changes exponentially.
作者
王希志
席川
付志伟
龚君顺
陈华
宁静
WANG Xi-zhi;XI Chuan;FU Zhi-wei;GONG Jun-shun;CHEN Hua;NING Jing(Sany Heavy Machinery Co.,Ltd.,Kunshan 215300,Jiangsu Province,China)
出处
《化学工程》
CAS
CSCD
北大核心
2020年第2期25-29,51,共6页
Chemical Engineering(China)
关键词
液滴蒸发
超疏水表面
椭球模型
模拟
基板温度
droplet evaporation
superhydrophobic surface
ellipsoid model
simulation
substrate temperature
