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Determination of velocity profiles of Bird-Carreau fluids in curvilinear microchannels using random sample consensus

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Abstract

Flow features of rheologically complex fluids inside curved microchannels should be meaningfully scrutinized for effective mixing, sorting, and manipulation of nano- and micro-sized colloids or particles. In this study, a particle streak velocimetry method with coordinate transformation is incorporated to depict experimentally the axial velocity profiles of Newtonian and non-Newtonian (Bird-Carreau, BC) fluids in a curvilinear microchannel under constant flow rate conditions. Theoretical velocity distributions for both fluids are favorably substantiated from experimental observations that employ a random sample consensus (RanSAC) algorithm under various channel geometric conditions, demonstrating the good agreement between experiments and simulations previously developed. It is confirmed that the BC fluid showed blunt and non-parabolic profiles in comparison to the Newtonian case at a low Dean number. The suggested algorithm and method for accurately observing microscale flow fields provide useful insights into the elaborate manipulation and processing of non-Newtonian fluids in curved channel devices.

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Acknowledgements

This research was supported by the KIST Institutional Program (project No. 2E29720 and No. 2E30580) provided to M.-S. Chun and by the National Research Foundation of Korea (NRF) of Korea grant (No. 2016R1A5A1009592 and No. 2017R1E1A1A01075107) provided to H.W. Jung.

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Authors and Affiliations

  1. Department of Chemical and Biological Engineering, Korea University, Seongbuk-gu, Seoul, 02841, Republic of Korea

    Kyu Yoon & Hyun Wook Jung

  2. Complex Fluids Laboratory, National Agenda Research Division, Korea Institute of Science and Technology (KIST), Seongbuk-gu, Seoul, 02792, Republic of Korea

    Kyu Yoon & Myung-Suk Chun

  3. Bio-Med Department, KIST School, Korea University of Science and Technology, Seoul, 02792, Republic of Korea

    Myung-Suk Chun

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  1. Kyu Yoon
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  2. Hyun Wook Jung
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  3. Myung-Suk Chun
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Correspondence to Hyun Wook Jung or Myung-Suk Chun.

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Yoon, K., Jung, H.W. & Chun, MS. Determination of velocity profiles of Bird-Carreau fluids in curvilinear microchannels using random sample consensus. Korea-Aust. Rheol. J. 32, 159–164 (2020). https://doi.org/10.1007/s13367-020-0015-4

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  • DOI: https://doi.org/10.1007/s13367-020-0015-4

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