Phys. Rev. Lett. 90, 144505 (2003) [4 pages]Ordered and Disordered Patterns in Two-Phase Flows in MicrochannelsReceived 15 July 2002; published 11 April 2003 We show that wetting properties crucially control the patterns in two-phase flows of immiscible fluids in microchannels. Ordered patterns, continuously entrained by the flow, are obtained when one phase completely wets the walls, while disordered patterns, intermittently adhering to the channel walls, are unavoidably produced when wetting is partial. A lower limit for the channel sizes capable of generating well structured objects (drops, pears, pearl necklaces, …) is presented. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.144505
DOI:
10.1103/PhysRevLett.90.144505
PACS:
47.54.+r, 82.40.Ck
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