Measurements of Three-Dimensional Flow in Microchannel With Complex Shape by Micro-Digital-Holographic Particle-Tracking Velocimetry
Measurements of Three-Dimensional Flow in Microchannel With Complex Shape by Micro-Digital-Holographic Particle-Tracking Velocimetry
复制标题
DOI：
10.1115/1.2818783
复制
发表时间：
2008-04
影响因子：
--
通讯作者：
S. Satake;Takafumi Anraku;H. Kanamori;T. Kunugi;Kazuho Sato;T. Ito
中科院分区：
文献类型：
--
作者：
S. Satake;Takafumi Anraku;H. Kanamori;T. Kunugi;Kazuho Sato;T. Ito
利用微型数字全息粒子跟踪测速仪(MICRO-DHPTV)对复杂形状的两个微通道内的流场进行了高时间分辨率测量。第一微通道具有Y形连接，该Y形连接将来自两个入口的流体组合到一个出口。在这种情况下，来自入口区的两个层流速度分布合并为一个层流速度分布。第二微通道具有会聚区域，流体从该会聚区域流入发散区域。在这个区域，出现了两个回流区。因此，在这两种情况下，都可以瞬时获得大约250个速度矢量。对于具有会聚区的微通道，出现在发散点处的两个回流区是从三维矢量场中捕获的，回流涡的轴线与三维矢量场具有一定的对准。之所以能观察到这种现象，是因为利用微型DHPTV可以得到包括深度方向在内的三维速度场。
High time-resolution flow field measurement in two microchannels with a complex shape is performed by a micro-digital-holographic particle-tracking velocimetry (micro-DHPTV). The first microchannel has a Y junction that combines the flow of fluid from two inlets into one outlet. In this case, two laminar velocity profiles from the inlet regions merge into one laminar velocity profile. The second microchannel has a convergence region from where a fluid flows into a divergence region. At this region, two recirculation regions appear. Consequently, approximately 250 velocity vectors in both cases can be obtained instantaneously. For a microchannel with the convergence region, the two recirculation regions that appear at the divergence point are captured from a three-dimensional vector field, with which the axes of recircular vortices have some alignment. The reason why we can observe this phenomenon is that a three-dimensional velocity, including the depth direction, can be obtained by micro-DHPTV.