On the forces of droplets in Poiseuille flow

The forces on droplets in Poiseuille flow in the Reynolds number range from 0.7 to 27 are determined experimentally. It is found that droplets migrate toward the centerline and experience drag considerably in excess of that prevailing in uniform flow. Rough correlations for the drag and lift coefficients as functions of the Reynolds number and a parameter characterizing the flow nonuniformity are developed.