Abstract In this work, a two-dimensional phase-change lattice Boltzmann model is used to investigate the pool boiling from a hybrid rough surface with a single cavity and one or two pillars on the superheated plate for an entire ebullition cycle. The bubble growth and departure dynamics on the hybrid pillared cavity surfaces, namely a single-pillared cavity surface (a surface with one cavity and one neighbouring pillar) and a double-pillared cavity surface (a surface with one cavity and one pillar on its both sides), are also compared with a simple cavity surface (a surface with only one cavity). The results showed that the incorporation of the pillar to the simple cavity surface increases the surface area and distance between the pinning locations of the three-phase contact line (TCL), and thus, enhances the bubble departure diameter and heat flux. It is found that bubble departure diameter and heat flux increase with cavity-pillar spacing up to a certain value, in this case sp∗ = 0.50, beyond which they start to decease and approach the simple cavity surface case at sp∗ = 1.0, while the opposite trend is observed for bubble departure frequency. The bubble departure diameter, frequency and heat flux also increase with pillar width. Compared to uniformly hydrophilic surfaces, the mixed wettability surfaces exhibit large heat flux with relatively small increase in bubble departure diameter.

中文翻译：

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具有腔柱结构的混合粗糙表面气泡动力学和传热的格子 Boltzmann 研究

摘要 在这项工作中，二维相变晶格 Boltzmann 模型用于研究在整个沸腾循环中过热板上具有单个腔和一个或两个支柱的混合粗糙表面的池沸腾。混合柱腔表面上的气泡生长和离开动力学，即单柱腔表面（具有一个腔和一个相邻柱的表面）和双柱腔表面（具有一个腔和一个柱的表面）侧），也与简单的空腔表面（只有一个空腔的表面）进行比较。结果表明，将支柱结合到简单的空腔表面增加了三相接触线 (TCL) 钉扎位置之间的表面积和距离，因此，提高气泡离开直径和热通量。发现气泡离开直径和热通量随着腔柱间距增加到一定值，在这种情况下 sp∗ = 0.50，超过这个值它们开始减小并在 sp∗ = 1.0 时接近简单的腔体表面情况，而观察到气泡离开频率的相反趋势。气泡离开直径、频率和热通量也随着柱宽而增加。与均匀亲水表面相比，混合润湿性表面表现出较大的热通量，而气泡离开直径的增加相对较小。而气泡离开频率则观察到相反的趋势。气泡离开直径、频率和热通量也随着柱宽而增加。与均匀亲水表面相比，混合润湿性表面表现出较大的热通量，而气泡离开直径的增加相对较小。而气泡离开频率则观察到相反的趋势。气泡离开直径、频率和热通量也随着柱宽而增加。与均匀亲水表面相比，混合润湿性表面表现出较大的热通量，而气泡离开直径的增加相对较小。