Effects of bubble coalescence dynamics on heat flux distributions under bubbles
Effects of bubble coalescence dynamics on heat flux distributions under bubbles
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DOI：
10.1002/aic.13932
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发表时间：
2013-05
期刊：
影响因子：
3.7
通讯作者：
Bi Jingliang;Lin Xipeng;D. Christopher
中科院分区：
文献类型：
--
作者：
Bi Jingliang;Lin Xipeng;D. Christopher
气泡聚结事件和单个气泡的成核，生长和离开观察与高速数据采集系统测量的热通量在不同的位置下的气泡同步的电荷耦合器件（CCD）相机。四种不同类型的合并事件发生的特征热通量签名的每一种类型的事件。在四个典型的加热器下，代表不同的位置下的气泡的传热测量显示出非常不同的热流特性在每个沸腾循环。结果表明，气泡在相互作用、滑动、拉伸和振荡过程中接触线的移动所引起的瞬态导热是导致聚并过程中高传热速率的主要机制。捕获在两个气泡之间的液体层的快速蒸发和接触线附近的较高热通量作为微层蒸发也产生高的热通量尖峰，但由于其持续时间短和影响面积小，影响较小。© 2012美国化学工程师学会AIChE J，59：1735-1745，2013
Bubble coalescence events and single bubble nucleation, growth, and departure were observed with a charge-coupled device (CCD) camera synchronized with a high-speed data acquisition system measuring the heat fluxes at different positions underneath the bubble. Four different kinds of coalescence events took place with characteristic heat flux signatures for each type of event. The heat transfer measurements under four typical heaters representing different positions under the bubble showed very different heat flux characteristics during each ebullition cycle. The results show that transient conduction due to the movement of the contact line during bubble interactions, sliding, stretching, and oscillating is the main mechanism resulting in the high heat transfer rates during coalescence. Fast evaporation of the liquid layer trapped between the two bubbles and higher heat fluxes near the contact line as the microlayer evaporated also generate high heat flux spikes but have less influence due to their short duration and small influence area. © 2012 American Institute of Chemical Engineers AIChE J, 59: 1735–1745, 2013