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

Title
Determination of velocity profiles of Bird-Carreau fluids in curvilinear microchannels using random sample consensus
Authors
전명석윤규정현욱
Keywords
curved microchannel; Bird-Carreau fluid; particle streak; velocimetry; micro flows
Issue Date
2020-05
Publisher
Korea-Australia Rheology Journal
Citation
VOL 32, NO 2-164
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.
URI
http://pubs.kist.re.kr/handle/201004/71422
ISSN
1226-119X
Appears in Collections:
KIST Publication > Article
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