Postcontact droplet spreading and bubble entrapment on a smooth surface

Postcontact droplet spreading and bubble entrapment on a smooth surface
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接触后液滴在光滑表面上的扩散和气泡的截留

DOI:
10.1103/physrevfluids.7.104003
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发表时间:
2022
影响因子:
2.7
通讯作者:
Sun, Ying
Sun, Ying
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhang, Lige;Soori, Tejaswi;Rokoni, Arif;Sun, Ying

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在本文中,我们使用高速成像和全内反射显微镜的组合来研究接触后的扩散动力学和气泡捕获的液滴冲击与不混相流体润滑的表面,遵循凹窝和膜接触模式。接触后的液滴扩散捕获了两种类型的气泡:(i)表面和(ii)体积,前者发生在气泡停留在液滴表面界面时,后者发生在液滴内部,因为撞击引起的气腔封闭。液滴表面接触的凹窝模式表明,由于液滴中心的接触点和随后的轴对称扩散,中心表面没有气泡。表面径向气泡可以通过调整冲击速度、液体表面张力和粘度来抑制。然后研究了早期接触后的扩散动力学,其中观察到扩散半径随时间的粘毛细标度。最后,利用润湿失效结垢的临界毛细数对表面径向气泡是否存在进行了较准确的预测。
In this paper, we use a combination of high-speed imaging and total internal reflection microscopy to study postcontact spreading dynamics and bubble entrapment of droplets impacting on surfaces lubricated with an immiscible fluid, following dimple and film modes of contact. The postcontact droplet spreading entraps two types of bubbles: (i) surface and (ii) bulk, where the former occurs when the bubbles remain at the droplet-surface interface and the latter takes place within the droplet because of the impact-induced air-cavity closure. The dimple mode of droplet-surface contact shows an absence of central surface bubble due to the contact point at the drop center and the subsequent axisymmetric spreading. The surface radial bubbles can be suppressed by tuning the impact velocity, liquid surface tension, and viscosity. Early-stage postcontact spreading dynamics are then studied for the dimple mode, where a viscocapillary scaling for the spreading radiusversus timeofis observed. Finally, the critical capillary number for wetting failure scaling is used to predict the presence of surface radial bubble entrapment with good accuracy.
DOI: 10.1063/1.4788693
发表时间: 2013-01-01
期刊: PHYSICS OF FLUIDS
影响因子: 4.6
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