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." />
Quantitative characterization of high molecular weight polymer solutions in microfluidic hyperbolic contraction flow
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  • 作者：Alfredo Lanzaro ; Zhuo Li ; Xue-Feng Yuan
  • 关键词：Polyacrylamide ; Microfabricated ; Hyperbolic contraction ; μ ; PIV ; Hencky strain ; Extensional flow
  • 刊名：Microfluidics and Nanofluidics
  • 出版年：2015
  • 出版时间：May 2015
  • 年：2015
  • 卷：18
  • 期：5-6
  • 页码：819-828
  • 全文大小：2,332 KB
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  • 作者单位：Alfredo Lanzaro (1)
    Zhuo Li (2)
    Xue-Feng Yuan (3)

    1. Manchester Institute of Biotechnology, School of Chemical Engineering and Analytical Science, The University of Manchester, Manchester, M13 9PL, UK
    2. State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, People’s Republic of China
    3. National Supercomputer Centre in Guangzhou, Research Institute on Application of High Performance Computing, Sun Yat-Sen University, Guangzhou, People’s Republic of China
  • 刊物类别：Engineering
  • 刊物主题：Engineering Fluid Dynamics
    Medical Microbiology
    Polymer Sciences
    Nanotechnology
    Mechanics, Fluids and Thermodynamics
    Engineering Thermodynamics and Transport Phenomena
  • 出版者：Springer Berlin / Heidelberg
  • ISSN：1613-4990
文摘
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-em class="EmphasisTypeItalic">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.

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