A liquid-liquid separator, with a parallel plate settler installed horizontally, is 1.4 m in length and has a separation distance of 30 mm between the plates. The densities of the two liquids to be separated are ρ_l/1 = 840 kg/m³ (dispersed phase) and ρ_l/2 = 1020 kg/m³ (continuous phase). The horizontal velocity of the mixture of two liquids is 1 m/min.

Determine the maximum size of droplet of the dispersed phase that will not be collected or coalesced while moving through the settler. You should assume that the droplets of dispersed phase move vertically at their terminal velocity.