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Experimental analysis of the coalescence process via head-on collisions in a time-dependent flow
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5.This comparison is a little less powerful than its numerical counterpart because we cannot visualize the film geometry with the present experimental setup
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16.The offset as defined in the experiments is the distance between the center of the drops and the inflow symmetry axis of the flow field, measured when the drops are separated by two undeformed drop diameters.
17.Although Lowenberg and Hinch (Ref. 30) have also proposed a mechanism for coalescence in the extensional quadrant, we believe that their mechanism is distinct from ours. (As far as we understand the mechanism they have proposed, we believe that it pertains to larger capillary number systems than those that we have considered in our experiments.)
18.The capillary numbers differ only because the drops collide in a glancing collision at an angle that is slightly different from being “head-on,” and hence to replicate the initial force along the line of centers in a head-on collision experiment requires a slight reduction in the velocity gradient relative to what it would be if the glancing collisions were head-on.
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