Figure 3.

(a) For a water droplet entering a Laplace trap with a terminal trap width of 20 μm, the net Laplace pressure developed depends on the size of the droplet. For the same size trap, larger droplets develop more Laplace pressure since the length dimension becomes greater for these droplets than for smaller droplets. (b) In a 20 μm opening trap, droplets of smaller size elongate to smaller extents than droplets of greater size. The extent of elongation direclty correlates to the distance between the front and back radii of the droplet, and results in the development of net Laplace pressure on the droplet.