Boiling is governed by bubble behaviors, and energetic bubble formation is favourable for boiling heat transfer efficiency but is prone to a boiling crisis. State-of-the-art boiling surfaces with active and passive modifications ensure a good compromise of a high heat transfer coefficient (HTC) and safety margin. However, bubble behaviors cannot be adjusted for two-phase boiling systems without in situ surface wettability control. Here we report a novel method to manipulate boiling via temperature-dependent wettability of pyroelectric coatings without any extra input. This wettability control is confirmed by the variation of hydrophilic hydroxyl radicals. As a result, we can achieve negative feedback boiling by reversibly altering the surface's wettability through alternate heating and cooling, retaining boiling in the high HTC region. Our work shows that pyroelectric coatings enhance the HTC at low heat fluxes and improve safety margins at high fluxes. The findings offer insights into improving heat transfer and highlight the potential of pyroelectric coatings for wettability control.

中文翻译：

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热释电效应诱导负反馈沸腾传热


沸腾受气泡行为的控制，高能气泡的形成有利于沸腾传热效率，但容易出现沸腾危机。具有主动和被动改性的先进沸腾表面确保了高传热系数 （HTC） 和安全裕度的良好折衷。然而，如果没有原位表面润湿性控制，就无法调整两相沸腾系统的气泡行为。在这里，我们报告了一种通过热释电涂层的温度相关润湿性来控制沸腾的新方法，而无需任何额外的输入。这种润湿性控制通过亲水性羟基自由基的变化得到证实。因此，我们可以通过交替加热和冷却来可逆地改变表面的润湿性，从而实现负反馈沸腾，从而将沸腾保持在高 HTC 区域。我们的研究表明，热释电涂层在低热通量下增强了 HTC，并在高通量下提高了安全裕度。这些发现为改善传热提供了见解，并突出了热释电涂层在润湿性控制方面的潜力。