Abstract In the present study, bubble growth on the boiling surfaces and pool boiling heat transfer characteristics of semi-modified pillar arrays are experimentally investigated at atmospheric pressure, while the bubble behaviors inside pillar gaps are numerically revealed in different contact angles by lattice Boltzmann method based on the pseudopotential LB model. The hybrid and hierarchical pillars are fabricated by semi-silver-deposition and wire-electrode-cutting respectively. The effects of wettability, surface morphology and surfactant concentration are considered. Deionized water, aqueous isopropanol and n-heptanol solutions with concentrations of 100 ppm, 200 ppm, and 800 ppm are used as the working liquids. The experimental results show that contact angles of isopropanol and n-heptanol solutions on copper plate are changed considerably by silver-deposition. Semi-silver-deposition and additions of isopropanol and n-heptanol considerably affect pool boiling heat transfer and bubble behaviors of straight and hierarchical copper square pillars. The numerical results show that vapor films generate at most gap bottoms at the contact angle of 131.8° which impede liquid supplement process toward the gaps compared with the contact angle of 98.7° on the straight pillar array surface.

中文翻译：

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半改性铜方柱阵列气泡行为和池沸腾传热的实验和数值研究

摘要 本研究在常压下实验研究了半改进柱阵列沸腾表面气泡的生长和池沸腾传热特性，同时基于格子玻尔兹曼方法数值揭示了不同接触角下柱间隙内的气泡行为。在赝势 LB 模型上。混合柱和分层柱分别通过半银沉积和线电极切割制成。考虑了润湿性、表面形态和表面活性剂浓度的影响。使用浓度为 100 ppm、200 ppm 和 800 ppm 的去离子水、异丙醇水溶液和正庚醇溶液作为工作液体。实验结果表明，镀银后异丙醇和正庚醇溶液在铜板上的接触角发生了很大变化。异丙醇和正庚醇的半银沉积和添加显着影响直和分级铜方柱的池沸腾传热和气泡行为。数值结果表明，与直柱阵列表面的接触角为98.7°相比，蒸汽膜在131.8°的接触角下最多产生间隙底部，阻碍了液体向间隙的补充过程。