论文标题
电场的电场增强电介质在支柱结构表面上的沸腾流体的沸腾：晶格玻尔兹曼研究
Electric field enhancement of pool boiling of dielectric fluids on pillar-structured surfaces: A lattice Boltzmann study
论文作者
论文摘要
在本文中，通过使用相变晶格玻尔兹曼（LB）模型与电场模型相结合，我们实际上研究了电场下柱结构表面上电介质流体的池沸腾的性能和增强机制。数值调查表明，应用电场会引起对电介质液在支柱结构表面上沸腾的池沸腾的影响。发现在电场的作用下，电力阻止了通道中核中的气泡越过柱顶的边缘。一方面，这种作用导致通道中的气泡结合，并阻止了通道的液体供应路径，从而导致中等渗透性状态下的池沸腾恶化。另一方面，它可以防止通道中的气泡与支柱顶部的气泡之间的聚结，从而抑制了连续蒸气膜的形成，因此延迟了沸腾的危机的发生。同时，电力可以促进柱顶上的气泡出发。因此，可以改善临界热通量（CHF）。根据显示的机制，将润湿性改性区域应用于支柱顶部，以进一步增强沸腾的传热。结果表明，可以通过施加电场来提高CHF和最大的热传递系数，从而提高CHF的沸腾表面上的沸腾性能，并通过将混合的润湿性应用于支柱结构表面来提高。
In this paper, by using a phase-change lattice Boltzmann (LB) model coupled with an electric field model, we numerically investigate the performance and enhancement mechanism of pool boiling of dielectric fluids on pillar-structured surfaces under an electric field. The numerical investigation reveals that applying an electric field causes both positive and negative influences on the pool boiling of dielectric fluids on pillar-structured surfaces. It is found that, under the action of an electric field, the electric force prevents the bubbles nucleated in the channels from crossing the edges of the pillar tops. On the one hand, such an effect results in the bubble coalescence in the channels and blocks the paths of liquid supply for the channels, which leads to the deterioration of pool boiling in the medium-superheat regime. On the other hand, it prevents the coalescence between the bubbles in the channels and those on the pillar tops, which suppresses the formation of a continuous vapor film and therefore delays the occurrence of boiling crisis. Meanwhile, the electric force can promote the departure of the bubbles on the pillar tops. Accordingly, the critical heat flux (CHF) can be improved. Based on the revealed mechanism, wettability-modified regions are applied to the pillar tops for further enhancing the boiling heat transfer. It is shown that the boiling performance on pillar-structured surfaces can be enhanced synergistically with the CHF being increased by imposing an electric field and the maximum heat transfer coefficient being improved by applying mixed wettability to the pillar-structured surfaces.
