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. 2013 Oct 11;3:2927. doi: 10.1038/srep02927

Figure 4. Water direction tendency coalescences in normal sequence and reverse sequence.

Figure 4

(a), In normal sequence water drops coalescence with the process of (D1 + D2) + D3. The drop D1 coalesces with drop D2 to form Drop D(1 + 2), and it moves towards bigger spindle-knots. With the water drops growing, drop D(1 + 2) is merging with drop D3 to form drop D(1 + 2) + 3. The length of movement (La) is ~2.80 mm with ~26.8 ms. (b), The reverse sequence of water drops coalescence. The drop D2′ and D3′ firstly combine together form the drop D(2′ + 3′). With the drops growing, the drop D1′ moves towards to the right due to the first mode (virtual frame) and coalesces with drop D(2′ + 3′) to form Drop D (2′ + 3′) + 1′. The length of movement (Lb) is ~2.46 mm with ~968.4 ms. Scale bars, 500 μm.