期刊
PHYSICAL REVIEW E
卷 79, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.79.056310
关键词
confined flow; drops; flow instability; jets; microchannel flow; multiphase flow; solubility
资金
- NSF [DMR-0602684]
- Harvard MRSEC [DMR-0820484]
- University of Almer [DPI 2008-06624-C03-03]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0820484, GRANTS:13883333] Funding Source: National Science Foundation
We investigate the effect of confinement on drop formation in microfluidic devices. The presence or absence of drop formation is studied for two immiscible coflowing liquids in a microfluidic channel, where the channel width is considerably larger than the channel height. We show that stability of the inner fluid thread depends on the channel geometry: when the width of the inner fluid is comparable to or larger than the channel height, hydrodynamic instabilities are suppressed, and a stable jet that does not break into drops results; otherwise, the inner fluid breaks into drops, in either a dripping or jetting regime. We present a model that accounts for the data and experimentally exploit this effect of geometric confinement to induce the breakup of a jet at a spatially defined location.
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