Critical lengths for the transition of bubble breakup in microfluidic T-junctions
Critical lengths for the transition of bubble breakup in microfluidic T-junctions
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DOI：
10.1016/j.ces.2014.02.037
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发表时间：
2014-05
影响因子：
4.7
通讯作者：
Xiaoda Wang;Chunying Zhu;Taotao Fu;Youguang Ma
中科院分区：
文献类型：
--
作者：
Xiaoda Wang;Chunying Zhu;Taotao Fu;Youguang Ma
研究了非对称微流控T形三通中四种不同流型之间的过渡机制，包括永久阻塞破裂(B1)、部分阻塞破裂(B2)、永久隧道破裂(B3)和非破裂(NB)。引入了两个临界无量纲气泡长度来描述B1和B2之间以及B2和B3之间的转变。这两个临界无量纲气泡长度的存在，可以用T形接头中破裂气泡的前端和后端位置及其几何构型的演变来解释。本工作中使用的非对称微流控T形接头比对称T形接头更容易破裂气泡。结果表明，本文所用非对称T结中气泡的破碎和不破碎行为与对称T结中气泡的破碎和非对称T结中液滴的破碎行为相似。
The study focuses on the transition mechanisms between four various flow patterns in asymmetric microfluidic T-junctions, including breakup with permanent obstruction (B1), breakup with part obstruction (B2), breakup with permanent tunnel (B3) and non-breakup (NB). Two critical dimensionless bubble lengths are introduced to describe the transitions between B1 and B2 and between B2 and B3. The existence of these two critical dimensionless bubble lengths is explained in terms of the evolutions of forefront and rear positions of the breaking bubbles and their geometric configuration in the T-junction. The asymmetric microfluidic T-junction used in the present work could more easily break bubbles than a symmetric T-junction. The results show that the breakup and non-breakup behaviors of bubbles in the asymmetric T-junction used in the present work are similar to those of bubbles in the symmetric T-junction and to those of droplets in the asymmetric T-junction.