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| Content Provider | Springer Nature Link |
|---|---|
| Author | Lanzaro, Alfredo Li, Zhuo Yuan, Xue Feng |
| Copyright Year | 2014 |
| Abstract | Nonlinear flows of polyacrylamide (PAAm) ( $$M_{\text{w}} = 5.7 \times 10^{6}\,{\text{g}}/{\text{mol}}$$ ) aqueous solutions through a micro-fabricated, hyperbolic contraction geometry with high Hencky strain ( $$\varepsilon_{{\text{H}}} = 3.7$$ ) have been characterized by micro-particle image velocimetry ( $$\mu $$ -PIV). Various flow dynamics regimes in a range of Weissenberg number (Wi) and Reynolds number (Re) are presented in a Wi–Re diagram. The symmetric corner vortices are only observed in the flow of low concentration PAAm solution ( $$c/c^{*}=3.3$$ ). In a higher concentration ( $$c/c^{*}=8.3$$ ), PAAm solution exhibits chaotic-like flow patterns in the strong nonlinear flow regime ( $$Wi>350$$ ). Extensional deformation in nonlinear flows of Wi up to 860 has been analyzed. Furthermore, the local stretch experienced by the polymer chain in complex flow is systematically quantified and linked to the corresponding velocity vector fields, which are valuable for understanding the highly nonlinear flow phenomena. |
| Starting Page | 819 |
| Ending Page | 828 |
| Page Count | 10 |
| File Format | |
| ISSN | 16134982 |
| Journal | Microfluidics and Nanofluidics |
| Volume Number | 18 |
| Issue Number | 5-6 |
| e-ISSN | 16134990 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2014-09-13 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Polyacrylamide Microfabricated Hyperbolic contraction µ-PIV Hencky strain Extensional flow Engineering Fluid Dynamics Biomedical Engineering Analytical Chemistry Nanotechnology and Microengineering |
| Content Type | Text |
| Resource Type | Article |
| Subject | Nanoscience and Nanotechnology Materials Chemistry Condensed Matter Physics Electronic, Optical and Magnetic Materials |
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