Droplet velocity in microfluidics Hele-Shaw cell: effect of the disjoining pressure

We present an experimental evidence of the disjoining pressure effect on the traveling velocity of highly confined viscous droplets in microfluidics. Two regimes are observed depending on the capillary number, $Ca=\mu_f U_d/\gamma$. Above a critical capillary number $Ca^*$ the droplet velocity $U_d$ follows $U_d \propto U_f Ca^{1/3}$, where $U_f$ is the velocity of the carrier liquid. However, for $Ca

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2013.DFD.L7.3