A translating stage system for ýý-PIV measurements surrounding the tip of a migrating semi-infinite bubble.
A translating stage system for ýý-PIV measurements surrounding the tip of a migrating semi-infinite bubble.
复制标题
用于围绕迁移的半无限气泡尖端进行 μ-PIV 测量的平移台系统。
DOI：
10.1088/0957-0233/21/1/015401
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发表时间：
2010
影响因子：
2.4
通讯作者：
Gaver3rd,DP
中科院分区：
文献类型：
--
作者：
Smith,BJ;Yamaguchi,E;Gaver3rd,DP
我们设计、制造和评估了一种新型的平移台系统（TSS），它增强了传统的微粒子图像测速（μ-PIV）系统。TSS已被用来提高测量的能力，在一个稳定的和脉动的重新开放条件下的玻璃毛细管中的迁移半无限气泡的尖端周围的流场。使用传统的μ-PIV系统，气泡尖端附近的观察是具有挑战性的，因为气泡的向前行进快速地扫过微观视场中的气液界面。平移阶段机械取消平均气泡尖端速度，保持在显微镜视野内的接口，并提供了十倍的数据收集效率相比，固定阶段的技术。这种显著的改进允许在长传播距离上几乎连续地观察流场。一个大的（136帧）系综平均速度场记录与TSS附近的一个稳步迁移的气泡的尖端比较以及在相同的流动条件下的固定阶段的结果。TSS的使用允许脉动气泡传播流场的整体平均测量，这实际上是不可能使用传统的固定级技术。我们证明了我们的能力来分析这些时间依赖性的两相流在振荡周期中的四个点使用整体平均流场。
We have designed, fabricated and evaluated a novel translating stage system (TSS) that augments a conventional micro particle image velocimetry (μ-PIV) system. The TSS has been used to enhance the ability to measure flow fields surrounding the tip of a migrating semi-infinite bubble in a glass capillary tube under both steady and pulsatile reopening conditions. With conventional μ-PIV systems, observations near the bubble tip are challenging because the forward progress of the bubble rapidly sweeps the air–liquid interface across the microscopic field of view. The translating stage mechanically cancels the mean bubble tip velocity, keeping the interface within the microscope field of view and providing a tenfold increase in data collection efficiency compared to fixed-stage techniques. This dramatic improvement allows nearly continuous observation of the flow field over long propagation distances. A large (136-frame) ensemble-averaged velocity field recorded with the TSS near the tip of a steadily migrating bubble is shown to compare well with fixed-stage results under identical flow conditions. Use of the TSS allows the ensemble-averaged measurement of pulsatile bubble propagation flow fields, which would be practically impossible using conventional fixed-stage techniques. We demonstrate our ability to analyze these time-dependent two-phase flows using the ensemble-averaged flow field at four points in the oscillatory cycle.