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Flow Behaviors of Polymer Solution in a Lid-Driven Cavity
Cuong Mai Bui1, Anh-Ngoc Tran Ho1, Xuan Bao Nguyen1
1The University of Danang-University of Technology and Education, 48 Cao Thang, Da Nang 550000, Vietnam.
Polymers
|June 24, 2022
Summary
Polymer flow in a lid-driven cavity is significantly affected by viscoplasticity, with increasing Oldroyd numbers (Od) leading to larger solid-like regions. Cavity geometry also impacts flow patterns and solid-like zone formation.
Area of Science:
- Fluid dynamics
- Rheology
- Polymer science
Background:
- Understanding polymer flow is crucial for processes like coating.
- Viscoplastic fluids exhibit both solid-like and fluid-like behaviors.
- The Oldroyd number (Od) characterizes viscoelasticity.
Purpose of the Study:
- To numerically investigate polymer flow in a lid-driven cavity.
- To analyze the influence of Oldroyd numbers (Od) on flow characteristics.
- To examine the effect of cavity geometry on polymer flow behavior.
Main Methods:
- Numerical simulation of polymer flow.
- Utilized the Herschel-Bulkley model with Papanastasiou's regularization.
- Studied a broad range of Oldroyd numbers (0≤Od≤50) at Re=0.001.
Main Results:
- Viscoplasticity significantly impacts velocity, viscosity, and vortex distributions.
- Increasing Oldroyd numbers (Od) enlarge and merge solid-like regions.
- Cavity aspect ratio and skew angle influence vortex structures and solid-like zones.
Conclusions:
- Polymer flow behavior is strongly governed by viscoplastic properties.
- Solid-like regions evolve with increasing viscoelasticity and geometric parameters.
- Detailed analysis of critical aspect ratios and dead zone heights provides design insights.
