The removal of respirable coal dust particles has been the focus of domestic and foreign research, and the spray dust suppression technology has been adopted for the prevention and control process; it is based on the mechanism whereby liquid droplets impact dust particles. To further study the wetting properties of microdroplets impacting respirable coal dust particles based on kinetics, this study focused on the droplet morphology, and mathematical and physical models of a microdroplet impacting a respirable coal dust particle were established to explore the variation laws of the droplet spreading and wetting under central and non-central impacts, for which the CLSVOF numerical simulation approach was adopted. The results showed the occurrence of gas retention at the phase interface, which affected the droplet wetting characteristics on the coal dust surface, after the contact between the liquid and dust particles. The influence of the impact velocity, particle size ratio, contact angle, and offset distance on the droplet spreading behavior was investigated by comparative analysis of 12 working conditions with different parameters. The droplets can completely wrap the coal dust particles under only one working condition parameter ( = 5m/s,Φ = 2, = 90°, = 0 μm). The microdroplets are extremely difficult to wet respirable coal dust particles and the spreading behavior of the final droplet could be divided into three states: static adsorption, complete encapsulation and permanent escape. Our results can help better understand the wetting relationship between microdroplets and respirable coal dust particles, serving as a basis for dust prevention and control.

中文翻译：

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基于动力学的微滴撞击可吸入煤尘颗粒的润湿特性

可吸入煤尘颗粒物的去除一直是国内外研究的重点，防治过程中采用喷雾抑尘技术；它基于液滴撞击灰尘颗粒的机制。为了进一步基于动力学研究微滴撞击可吸入煤尘颗粒的润湿特性，本研究以液滴形态为研究对象，建立了微滴撞击可吸入煤尘颗粒的数学和物理模型，探讨了液滴铺展的变化规律。以及中心和非中心冲击下的润湿，采用CLSVOF数值模拟方法。结果表明，液体与粉尘颗粒接触后，在相界面处发生了气体滞留，影响了煤尘表面的液滴润湿特性。通过对12种不同参数的工况进行对比分析，研究了冲击速度、粒径比、接触角和偏移距离对液滴铺展行为的影响。仅在一种工况参数（=5m/s、Φ=2、=90°、=0μm）下，液滴即可将煤尘颗粒完全包裹。微滴是极难润湿可吸入煤尘颗粒的，最终液滴的铺展行为可分为静态吸附、完全包封和永久逃逸三种状态。我们的研究结果有助于更好地理解微滴与可吸入煤尘颗粒之间的润湿关系，为粉尘防治提供依据。