Thermocapillary-actuated contact-line motion of immiscible binary fluids over substrates with patterned wettability in narrow confinement
Thermocapillary-actuated contact-line motion of immiscible binary fluids over substrates with patterned wettability in narrow confinement
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DOI：
10.1103/physreve.90.023011
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发表时间：
2014-08-20
影响因子：
2.4
通讯作者：
Chakraborty, Suman
中科院分区：
文献类型：
--
作者：
DasGupta, Debabrata;Mondal, Pranab Kumar;Chakraborty, Suman
我们研究了热毛细管驱动的接触线动力学的两个不相容的流体在一个狭窄的流体限制，包括底物与图案的润湿性变化。我们的研究基于相场理论，证明了接触线的速度是外加温度梯度和衬底润湿特性综合作用的强函数。最后，我们评估了不同的能量转移率，结果表明，流体在固体表面滑移的耗散在将能量转移到接触线运动中起主导作用。实际上，我们的分析提供了一种巧妙的方法，通过同时调整施加的温度梯度和基材的润湿性，在狭窄的流体限制下控制毛细管填充速度。
We investigate thermocapillary-driven contact-line dynamics of two immiscible fluids in a narrow fluidic confinement comprising substrates with patterned wettability variations. Our study, based on phase field formalism, demonstrates that the velocity of the contact line is a strong function of the combined consequences of the applied thermal gradient and the substrate wetting characteristics. Finally, we evaluate different energy transfer rates and show that the dissipation due to fluid slip over the solid surface plays a dominating role in transferring energy into the contact-line motion. Our analysis, in effect, provides an elegant way of controlling the capillary filling rate in a narrow fluidic confinement by tailoring the applied temperature gradient and the substrate wettability in tandem.