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首页> 外文会议>BSME International Conference on Thermal Engineering >Nano scale Dynamics of Bubble Nucleation in Confined Liquid Subjected to Rapid Cooling: Effect of Solid-Liquid Interfacial Wettability
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Nano scale Dynamics of Bubble Nucleation in Confined Liquid Subjected to Rapid Cooling: Effect of Solid-Liquid Interfacial Wettability

机译：快速冷却局限性液体泡沫成核的纳米尺度动态：固液界面润湿性的影响

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This study focuses on the occurrence of bubble nucleation in a liquid confined in a nano scale confinement and subjected to rapid cooling at one of its wall. Due to the very small size scale of the present problem, we adopt the molecular dynamics (MD) approach. The liquid (Argon) is confined within two solid (Platinum) walls. The temperature of the upper wall of the confinement is maintained at 90 K while the lower wall is being cooled rapidly to 50 K from initial equilibrium temperature of 90 K within 0.1 ns. This results in the nucleation and formation of nanobubbles in the liquid. The pattern of bubble nucleation has been studied for three different conditions of solid-liquid interfacial wettability such as hydrophilic, hydrophobic and neutral. Behavior of bubble nucleation is significantly different in the three case of solid-liquid interfacial wettability. In case of the hydrophobic confinement (weakly adsorbing), the liquid cannot achieve deeper metastability; vapor layers appear immediately on the walls. In case of the neutral confinement (moderately adsorbing), bubble nucleation is promoted by the walls where the nucleation is heterogeneous. In case of the hydrophilic walls (strongly adsorbing) bubbles are developed inside the liquid; that is the nucleation process is homogeneous. The variation in bubble nucleation under different conditions of surface wettability has been studied by the analysis of number density distribution, spatial temperature distribution, spatial number density distribution and heat flux through the upper and lower walls of the confinement. The present study indicates that the variation of heat transfer efficiency due to different surface wettability has significant effect on the size, shape and location of bubble nucleation in case rapid cooling of liquid in nano confinement.
机译：该研究侧重于在纳米尺度限制中狭窄的液体中的泡沫成核的发生，并在其一个墙壁上进行快速冷却。由于目前问题的尺寸非常小，我们采用分子动力学（MD）方法。液体（氩气）仅限于两个固体（铂）壁内。限制的上壁的温度保持在90 k，而下壁正在快速冷却至50k，从初始平衡温度为90k，在0.1ns内。这导致液体中的纳米泡的成核和形成。已经研究了泡沫成核的图案，用于三种不同的固体界面润湿性条件，例如亲水，疏水和中性。在固体液体界面润湿性的三种情况下，泡泡成核的行为显着差异。在疏水限制（弱吸附）的情况下，液体不能达到更深的稳定性;蒸汽层立即出现在墙壁上。在中性限制（中等吸附）的情况下，泡沫成核被核心是异质的壁促进。在液体内部开发亲水性壁（强吸附）气泡;那是成核过程是均匀的。通过分析数量密度分布，空间温度分布，空间数密度密度分布和通过限制的上壁的分析，研究了在不同表面润湿条件下的泡沫成核的变化。本研究表明，由于不同的表面润湿性引起的传热效率的变化对纳米限制液体快速冷却液体的尺寸，形状和泡沫成核的尺寸和位置具有显着影响。

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