Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/90263
Title: Elastic turbulence of aqueous polymer solution in multi-stream micro-channel flow
Authors: Tai, Jiayan
Lam, Yee Cheong
Keywords: DRNTU::Engineering::Mechanical engineering
Elastic Turbulence
Microfluidics
Issue Date: 2019
Source: Tai, J., & Lam, Y. C. (2019). Elastic Turbulence of Aqueous Polymer Solution in Multi-Stream Micro-Channel Flow. Micromachines, 10(2), 110-. doi:10.3390/mi10020110
Series/Report no.: Micromachines
Abstract: Viscous liquid flow in micro-channels is typically laminar because of the low Reynolds number constraint. However, by introducing elasticity into the fluids, the flow behavior could change drastically to become turbulent; this elasticity can be realized by dissolving small quantities of polymer molecules into an aqueous solvent. Our recent investigation has directly visualized the extension and relaxation of these polymer molecules in an aqueous solution. This elastic-driven phenomenon is known as ‘elastic turbulence’. Hitherto, existing studies on elastic flow instability are mostly limited to single-stream flows, and a comprehensive statistical analysis of a multi-stream elastic turbulent micro-channel flow is needed to provide additional physical understanding. Here, we investigate the flow field characteristics of elastic turbulence in a 3-stream contraction-expansion micro-channel flow. By applying statistical analyses and flow visualization tools, we show that the flow field bares many similarities to that of inertia-driven turbulence. More interestingly, we observed regions with two different types of power-law dependence in the velocity power spectra at high frequencies. This is a typical characteristic of two-dimensional turbulence and has hitherto not been reported for elastic turbulent micro-channel flows.
URI: https://hdl.handle.net/10356/90263
http://hdl.handle.net/10220/48451
DOI: 10.3390/mi10020110
Rights: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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