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首页> 外文期刊>International Journal of Heat and Mass Transfer >Single bubble dynamics on hydrophobic-hydrophilic mixed surfaces
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Single bubble dynamics on hydrophobic-hydrophilic mixed surfaces

机译：疏水-亲水混合表面上的单气泡动力学

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摘要

Single bubble dynamics of distilled water were experimentally investigated on hydrophobic-hydrophilic mixed surfaces with hydrophobic dot diameters ranging from 50 μm to 6 mm. The heterogeneity of surface wettability could affect interfacial dynamics and cause the pinning phenomenon of the bubble interface, a contact angle transition, a 'stick-slip' behavior, and the interface necking during bubble growth. The triple line of a bubble initiated from a hydrophobic dot was pinned at its edge where a singularity of the surface wettability occurs. During this contact line pinning, the contact angle of bubble interface decreased. When the contact angle decreased to equal the receding contact angle of a bare hydrophilic surface, the triple line moved outward rapidly; this is called 'slip' behavior. After such process, the nucleated bubble vertically elongated and subsequently departed from the surface. The contact angle transition during the pinning and departing behavior was described by considering the capillary length of the bubble determined by the vertical deformation of bubbles. Using the bubble dynamics on the hetero-geneously patterned surface with compactly arranged 50 μm dots, boiling heat transfer coefficient enhanced to 2.1 times that in the bare hydrophilic surface.
机译：在疏水点直径范围为50μm至6 mm的疏水-亲水混合表面上，对蒸馏水的单泡动力学进行了实验研究。表面润湿性的异质性可能影响界面动力学，并导致气泡界面的钉扎现象，接触角过渡，“粘滑”行为以及气泡生长过程中的界面颈缩。由疏水点引发的气泡的三线被钉扎在其边缘处，在该边缘处出现表面润湿性的奇异性。在该接触线钉扎期间，气泡界面的接触角减小。当接触角减小到等于裸露的亲水性表面的后退接触角时，三线迅速向外移动；当接触角减小到等于亲水性裸露表面的后退接触角时，三线迅速向外移动。这被称为“滑倒”行为。经过这样的处理，成核的气泡垂直拉长，随后从表面离开。通过考虑由气泡的垂直变形确定的气泡的毛细管长度来描述在钉扎和脱离行为期间的接触角过渡。使用具有紧凑排列的50μm点的异质构图表面上的气泡动力学，沸腾传热系数提高到裸亲水表面的2.1倍。

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