The dynamic wetting behavior of droplets impacting the coal surface directly affects the efficient application of water-based dust suppression materials in coal-related industrial production. In this paper, ultrapure water, Tween-80, and sodium carboxymethyl cellulose are taken as the research objects. Using high-speed photography technology, the spreading, oscillation process, and splash morphology of many kinds of droplets during impacting the coal surface are captured. The effects of viscosity, surface tension, and impact velocity on dynamic wetting characteristics were studied. The results show that with the decrease of surface tension, the retraction and oscillation of droplets are significantly reduced. For the same kind of droplets, the greater the impact velocity, the faster the droplet spread, and the dimensionless maximum spreading coefficient (β_max) and dimensionless steady-state spreading coefficient (β_e) of droplets are bigger. With the increase of velocity, the time for different kinds of droplets to reach the β_max increases. At the same impact velocity, β_max and β_e of droplets (0.2% Tween-80 + 0.1% sodium carboxymethyl cellulose) are the largest, indicating that adding a small amount of sodium carboxymethyl cellulose can promote droplet spreading. With the increase of sodium carboxymethyl cellulose content, β_max and β_e decreased gradually. The results have a great significance to the research, development, and scientific utilization of water-soluble polymer dust inhibitors.

中文翻译：

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羧甲基纤维素钠对抑尘液滴冲击煤面动态润湿特性的影响

液滴撞击煤表面的动态润湿行为直接影响水基抑尘材料在涉煤工业生产中的高效应用。本文以超纯水、Tween-80、羧甲基纤维素钠为研究对象。利用高速摄影技术，捕捉了多种液滴撞击煤体表面时的扩散、振荡过程和飞溅形态。研究了粘度、表面张力和冲击速度对动态润湿特性的影响。结果表明，随着表面张力的降低，液滴的回缩和振荡明显减弱。对于同一种液滴，撞击速度越大，液滴扩散越快，_max ) 和液滴的无量纲稳态扩散系数 (β _e ) 较大。随着速度的增加，不同种类的液滴达到 β _{max 的}时间增加。在相同的冲击速度下，液滴（0.2% Tween-80 + 0.1% 羧甲基纤维素钠）的β _max和β _e最大，说明加入少量羧甲基纤维素钠可以促进液滴扩散。随着羧甲基纤维素钠含量的增加，βmax_和βe_逐渐降低。研究结果对水溶性高分子抑尘剂的研究、开发和科学利用具有重要意义。