Fluid flows play a central role in scientific and technological development, many of these are characterized by dominant oscillation, such as the vortex shedding wake nearly all transportation vehicles. The ability to control is critical improve aerodynamic performance unsteady fluid flow systems. This goal requires precise characterization how perturbations affect long-time phase oscillatory f...

In some case of laboratory and industrial applications, various kind of measurement instruments must be placed in a conduit, in which multiphase fluid flows. Vortex shedding for any immersed body in flow field is created with a frequency, which according to flow conditions such as flow rates, geometry of body, etc. may be constant or variable. Failure may happen, if this frequency is close to o...

Designing on-chip microfluidic pumps requires that the dependence of pressure drop across the device on the fluid flow rate be known. This relationship can be complicated for the case of two-phase droplet type flows. We characterized the flow-pressure relationship for the single-file flow of water drops in oil in microfluidic channels of rectangular cross sections. The pressure for such droplet...

In this paper, we review recent experimental studies on single-phase and multiphase flows in microchannels. Brief overviews of physical phenomena of fluid flow in microchannels, and measurement techniques mainly in conjunction with the flow visualization, are given. Regarding the studies of single-phase flows, the current state-of-the-art of electrokinetics and optofluidics is outlined. Then th...

A numerical scheme to simulate three-phase fluid flows with phase change is proposed. By combining the Cahn-Hilliard model for water-air interface, Allen-Cahn equation ice and Navier-Stokes momentum, we solve evolution of interface water-ice simultaneously, including volume expansion associated solidification due density difference between water ice. Unlike existing schemes assuming a divergenc...