Vapor bubble-bubble penetration during subcooled pool boiling in a nonionic surfactant aqueous solution
Vapor bubble-bubble penetration during subcooled pool boiling in a nonionic surfactant aqueous solution
复制标题
非离子表面活性剂水溶液过冷池沸腾过程中的蒸气泡-气泡渗透
DOI：
10.1016/j.ijheatmasstransfer.2020.120142
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发表时间：
2020
影响因子：
5.2
通讯作者：
Su Wen-Tao
中科院分区：
文献类型：
--
作者：
Guo Dong-Sheng;Li Xiao-Bin;Zhang Hong-Na;Li Feng-Chen;Su Wen-Tao
沸腾是工业过程中一种有效的传热方法。它产生蒸汽以带走大量的热量。沸腾液体中气泡的演化，特别是气泡的生长，是决定受热面传热强度的参数之一。由于受到多种物理或化学因素的影响，气泡的生长过程十分复杂。在这里，我们首次报告了在非离子表面活性剂辅助下的池沸腾过程中蒸汽泡-气泡相互作用过程（气泡与其在同一成核位点生成的相邻气泡相互作用）的新现象。不同的气泡相互作用被定义为气泡-气泡穿透、气泡-气泡刺穿和双重穿透。它的动机是过冷池沸腾时加热器释放的微泡。对表面活性剂水溶液中的气泡动力学进行可视化和分析。人们对表面活性剂存在下的蒸汽泡的产生、生长和相互作用给予了很多关注。值得注意的是，在当前条件下，气泡穿透现象频繁发生。这些发现具有基础和实际意义，希望有助于更好地理解表面活性剂辅助沸腾机制。
Boiling is encountered in industrial processes as an effective heat transfer method. It generates vapor to remove a large amount of heat. The evolution of vapor bubbles in a boiling liquid, especially the growth of bubbles, is one of the parameters that determine the heat transfer strength of a heating surface. The growth process of bubble is complicated due to many physical or chemical factors. Here, for the first time, we report a new phenomenon of vapor bubble–bubble interaction process (a bubble interacts with its neighboring one(s) generated at the same nucleation site) during pool boiling aided by a nonionic surfactant. The different bubble interactions are defined as bubble–bubble penetration, bubble–bubble piercing, and double penetrations. It is motivated by microbubble emission from heater in subcooled pool boiling. Bubble dynamics in aqueous surfactant solution was visualized and analyzed. Much attention was paid on the vapor bubble generation, growth, and interaction in the presence of surfactant. It is worth noting that the bubble penetration frequently occurs in the current conditions. The findings are of fundamental and practical relevance, and in the hope to contribute to better understanding of surfactant-aided boiling mechanism.