表面纳米结构和润湿性对池沸腾影响的分子动力学研究
Effects of surface nanostructure and wettability on pool boiling: A molecular dynamics study
摘要：
我们研究的作用，表面拓扑结构，表面化学，和壁面温度沸腾，气泡成核和生长的开始，以及可能形成的绝缘蒸汽膜通过大规模的MD模拟。在数值实验中，我们通过在运动活塞上施加一个恒定的力来控制系统的压力。模拟结果表明，纳米结构的存在触发了气泡的形成，确定了成核位点，并促进了从热衬底到水的能量传递。另一方面，表面化学决定了形成的气泡的形状。亲水性表面化学加速气泡成核，然而，减慢气泡膨胀，从而推迟蒸汽膜的形成。因此，亲水表面提供从热壁到水的更好的能量传递。通过分析系统的能量，我们表明，不考虑壁的拓扑结构和化学，有一个壁的温度为转移能量的量是最大的。
英文摘要：
We study the role of surface topology, surface chemistry, and wall superheat temperature on the onset of boiling, bubble nucleation and growth, and the possible formation of an insulating vapour film by means of large-scale MD simulations. In the numerical experiments, we control the system pressure by imposing a constant force on a moving piston. The simulations reveal that the presence of a nanostructure triggers the bubble formation, determines the nucleation site and facilitates the energy transfer from the hot substrate to the water. The surface chemistry, on the other hand, governs the shape of the formed bubble. A hydrophilic surface chemistry accelerates the bubble nucleation, however, decelerates the bubble expansion, thus postponing the formation of the film of vapour. Therefore, a hydrophilic surface provides better energy transfer from the hot wall to the water. By analysing the system energy, we show that irrespective of wall topology and chemistry, there is a wall temperature for which the amount of transferred energy is maximum.
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