Research Article
Emulsion Droplet Pair Coalescence under a Direct Current Electric Field
Figure 4
Dynamics of the droplet pair approach leading to the process of coalescence in a uniform DC electric field. (a) Velocity vector field at different time intervals for the uniform-sized droplet pair, R/Ro = 1. (b) Velocity vector field at different time intervals for the nonuniform-sized droplet pair, R/Ro = 0.5. Color legend shows the magnitude of velocity. (c) Effect of the droplet pair radius ratio, R/Ro, on the velocity difference between the centers of the nonuniform-sized droplet pair during the coalescing process. Here, the time is measured from the instant of the onset of the droplet pair interface coalescence/merger. For (a), (b), and (c), Cae = 0.12 and initial interfacial separation = 0.4 mm. The detailed simulation conditions are ℜ = 107, ℘ = 24.5, and λ = 10−3.
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