期刊
SOFT MATTER
卷 14, 期 8, 页码 1344-1354出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7sm01106g
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资金
- Fundacao para a Ciencia e a Tecnologia (FCT) through POPH/FSE and national funding from MEC [SFRH/BPD/75258/2010]
- European Research Council (ERC), under the European Commission [307499]
- Fundacao para a Ciencia e a Tecnologia [UID/EMS/00532/2013]
- European Research Council (ERC) [307499] Funding Source: European Research Council (ERC)
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/75258/2010, UID/EMS/00532/2013] Funding Source: FCT
We experimentally investigate the dynamics of viscoelastic fluid flows in cross-slot microgeometries under creeping flow conditions. We focus on the unsteady flow regime observed at high Weissenberg numbers (Wi) with the purpose of understanding the underlying flow signature of elastic turbulence. The effects of the device aspect ratio and fluid rheology on the unsteady flow state are investigated. Visualization of the flow patterns and time-resolved micro-particle image velocimetry were carried out to study the fluid flow behavior for a wide range of Weissenberg numbers. A periodic flow behavior is observed at low Weissenberg numbers followed by a more complex dynamics as Wi increases, eventually leading to the onset of elastic turbulence for very high Weissenberg numbers.
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