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A study visualizing the collapse of vapor bubbles in a subcooled pool

机译：可视化过冷池中气泡破裂的研究

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摘要

The condensation processes of vapor bubbles in a subcooled pool were recorded and analyzed, which could help to illustrate the mechanism of collapse of vapor bubbles and emission of microbubbles during Microbubble Emission Boiling (MEB). Vapor bubbles were injected into the subcooled pool through an orifice with the inner diameter of 4 mm at different vapor volumetric flow rates. Visualized results showed that the bubble surface became rougher and more unstable with the increase in liquid subcooling and volumetric flow rate, during which four condensation features were confirmed and defined as smooth bubble regime, shape oscillation regime, transition regime and capillary wave regime, respectively. Fine surface wave formed after a while of condensation would enlarge the effective area of condensation, resulting in the acceleration of bubble condensation. Furthermore, the fine surface wave which might also lead to bubble collapse only appeared on bubble surface at liquid subcooling over 25 K and vapor volumetric flow rate higher than 0.74 m~3/h, which corresponded to the occurrence conditions of MEB. After the sudden collapse of the vapor bubble with capillary wave, a great many microbubbles formed, with a greater velocity and much smaller radius with subcooling and vapor injection rate increasing. In the region of MEB, a strong surface wave usually appeared on vapor film before the film collapse and the emission of microbubbles. Nevertheless, the film surface formed in film boiling was relatively smooth compared with that formed in MEB. All of the experiments results and analysis illustrated that the strong surface wave introduced by condensation may be one of the reasons resulting in the formation of MEB.
机译：记录并分析了过冷池中气泡的冷凝过程，这有助于说明微气泡排放沸腾（MEB）期间气泡破裂和微气泡排放的机理。在不同的蒸气体积流量下，通过内径为4 mm的孔将蒸气气泡注入过冷池中。可视化结果显示，随着液体过冷度和体积流量的增加，气泡表面变得更粗糙，更不稳定，在此期间，确认了四个冷凝特征，分别定义为光滑气泡状态，形状振荡状态，过渡状态和毛细波状态。凝结一段时间后形成的细微表面波会增大凝结的有效面积，从而加速气泡凝结。此外，可能导致气泡破裂的细小表面波仅在液体过冷超过25 K且蒸汽体积流量高于0.74 m〜3 / h时才出现在气泡表面，这与MEB的发生条件相对应。在蒸汽气泡因毛细管波突然坍塌之后，随着过冷和蒸汽注入速率的增加，形成了许多微气泡，它们具有更大的速度和更小的半径。在MEB的区域中，通常在蒸汽膜破裂和微气泡发射之前，在蒸汽膜上会出现强表面波。然而，与在MEB中形成的相比，在膜沸腾中形成的膜表面相对光滑。所有的实验结果和分析表明，凝结引入的强表面波可能是形成MEB的原因之一。

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  • 作者

    Jiguo Tang; Changqi Yan; Licheng Sun;

  • 作者单位

    Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin, Heilongjiang 150001, China;

    Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin, Heilongjiang 150001, China;

    State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource & Hydropower, Sichuan University, Chengdu 610065, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Collapse of bubble; Microbubble Emission Boiling; Condensation; Surface wave;

    机译：泡沫破裂;微气泡排放沸腾;缩合;表面波;

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