Secondary Dean flow characteristics of inelastic Bird-Carreau fluids in curved microchannels
- Authors
- Yoon, Kyu; Jung, Hyun Wook; Chun, Myung-Suk
- Issue Date
- 2월-2020
- Publisher
- KOREAN SOC RHEOLOGY
- Keywords
- secondary Dean flow; flow skewness; Bird-Carreau model; curved microchannel; microfluidics
- Citation
- KOREA-AUSTRALIA RHEOLOGY JOURNAL, v.32, no.1, pp.61 - 70
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- KOREA-AUSTRALIA RHEOLOGY JOURNAL
- Volume
- 32
- Number
- 1
- Start Page
- 61
- End Page
- 70
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/57900
- DOI
- 10.1007/s13367-020-0007-4
- ISSN
- 1226-119X
- Abstract
- To effectively control the mixing of target materials inside microfluidic devices, the Dean flow features of generalized-Newtonian Bird-Carreau (BC) fluids in curved rectangular channels are theoretically investigated, as a passive technique. Governing equations coupled with the Cauchy momentum equation and the BC model are solved using the finite volume scheme with a semi-implicit method for pressure-linked equations-revised (SIMPLER) algorithm. The effects of the rheological parameters of BC model, such as viscosity ratio, power-law index, and relaxation time constant, on the Dean flow are systematically examined in a wide range of Dean numbers (Dn), (very low to O(10(2))). The entire flow characteristics of BC fluids in curved microchannels with increasing Dn are quantified using flow skewness, Dn(Ref)/Dn(MES), and magnitude of vorticity, resulting in two main findings of a more outward-skewed streamwise velocity profile and a more enhanced secondary Dean vortex for non-Newtonian fluids in comparison to the Newtonian case at the same Dn.
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Collections - College of Engineering > Department of Chemical and Biological Engineering > 1. Journal Articles
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