The role of surface wettability on the growth of vapour bubbles
The role of surface wettability on the growth of vapour bubbles
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DOI：
10.1016/j.ijheatmasstransfer.2023.124657
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发表时间：
2023-12
影响因子：
5.2
通讯作者：
Patrick Sullivan;Duncan Dockar;Ryan Enright;M. Borg;R. Pillai
中科院分区：
文献类型：
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作者：
Patrick Sullivan;Duncan Dockar;Ryan Enright;M. Borg;R. Pillai
由于其对两相热管理系统、超声波清洗和超声波清洗性能的重要性，非均匀蒸汽气泡的形成被广泛研究。然而，表面在决定气泡生长方面所起的作用仍然知之甚少。目前，对非均匀蒸汽气泡生长的理论理解仅限于表面附近的半球形气泡或完全球形气泡。我们先前已经开发了一种惯性热模型，以准确预测来自周围流体的热传递如何影响从纳米尺度到宏观尺度的均质蒸汽泡生长（Sullivan等人，J. Fluid Mech.948（A55）：1-15，2022）。通过考虑气泡的几何形状和周围流体中的可用热能的表面及其润湿性的存在，我们扩展了我们的模型来捕获heterogeneousvapor bubble的生长。使用分子模拟，我们不仅展示了流体-固体相互作用的强度如何影响生长速率，而且还展示了在亲液表面上的气泡下形成的吸附流体层如何在确定气泡形状和随后的动力学中起着至关重要的作用。这些见解有可能提高系统的性能，涉及从液体到蒸汽相的变化，通过更好地了解表面润湿性在这个过程中的作用。
The formation of heterogeneous vapour bubbles is widely studied due to its importance to two-phase thermal management systems, ultrasonic cleaning, and turbomachinery performance. However, the role that the surface plays in determining the growth of a bubble is still poorly understood. Currently, theoretical understanding of heterogeneous vapour bubble growth is limited to hemispherical bubbles or completely spherical bubbles next to a surface. We have previously developed an inertio-thermal model to accurately predict how heat transfer from the surrounding fluid affectshomogeneousvapour bubble growth from the nanoscale to the macroscale (Sullivan et al.J. Fluid Mech.948(A55):1-15, 2022). By accounting for the presence of the surface and its wettability on both the geometry of the bubble and on the available thermal energy in the surrounding fluid, we extend our model to captureheterogeneousvapour bubble growth. Using molecular simulations, we show not only how the strength of fluid-solid interaction affects the growth rate, but also how the formation of an adsorbed fluid layer under the bubble on lyophilic surfaces plays a vital role in determining the bubble shape and subsequent dynamics. These insights have potential to improve the performance of systems involving a change of phase from liquid to vapour by better understanding the role of surface wettability on this process.