Effect of korteweg stress in miscible liquid two-layer flow in a microfluidic device
Effect of korteweg stress in miscible liquid two-layer flow in a microfluidic device
复制标题
微流体装置中混溶液体双层流动中科特韦格应力的影响
DOI：
10.1007/bf03181654
复制
发表时间：
2005
影响因子：
1.7
通讯作者：
T. Kitamori
中科院分区：
文献类型：
--
作者：
Y. Sugii;K. Okamoto;A. Hibara;M. Tokeshi;T. Kitamori
采用粒子图像测速技术（PIV）对宽120 μm、深35 μm的Y型微流控装置中的混溶液两相流进行了研究，以揭示流体界面处的流动特性。在水和乙醇之间的界面周围获得的速度的空间分辨率为5.9 × 1.5 μ m2，表明在界面处的剪切应力的不平衡。这种不平衡的原因是由于在可混溶的两层流中扩散引起的浓度梯度引起的界面张力梯度产生的Korteweg应力。在浓度梯度较大的情况下，应力会引起界面不稳定，破坏两种流动流体的均匀混合。
Miscible liquid two-layer flow in a Y-shaped microfluidic device, which consists of microchannels with 120 μm in width and 35 μm in depth, is investigated by particle image velocimetry (PIV) to clarify the flow characteristics at fluid interfaces. The obtained velocities with a spatial resolution of 5.9 x 1.5 μm2around the interface between water and ethanol indicate an imbalance in shear stress at interface. The reason of the imbalance is to be the Korteweg stress generated by interfacial tension gradient due to a concentration gradient by diffusion in a miscible two-layer flow. The stress may cause an interfacial instability and destroy a uniform mixing in two flowing fluids in the case of large concentration gradient.
影响因子：
1.7
作者：
Y. Sugii;K. Okamoto
通讯作者：
Y. Sugii;K. Okamoto