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Optical spinning rheometry test on viscosity curves of less viscous fluids at low shear rate range

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Abstract

We propose a method, named optical spinning rheometry (OSR), to acquire kinematic viscosity curves of Newtonian and non-Newtonian fluids in the same framework. The OSR is independent of torque measurements and utilizes velocity information measured by particle tracking velocimetry. This optical approach enables flexibility in velocity resolution, and benefits exploring the low shear rate region. In addition, the kinematic viscosity of less viscous fluids like water or dilute polymer solutions can be assessed as being free from the mechanical limitations of torque sensors. The applicable range of the OSR is discussed in detail, and its performance is verified in Newtonian fluids. Demonstrations in dilute xanthan gum solutions, concentrations of \(O(10~\textrm{ppm})\), show the capability of measuring their shear-thinning behaviors and the kinematic viscosity curves even in the first Newtonian regime.

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The data acquired during this study is available from the corresponding author on reasonable request.

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Funding

The authors acknowledge financial supports by a Grant-in-Aid for Japan Society for Promotion of Science Fellows (Grant No. JP19J20096) and JST PRESTO (Grant No. JPMJPR2106).

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DN contributed to acquisition of funding, conception and design of study, acquisition, analysis and interpretation of data, drafting the manuscript. KO contributed to conception and design of study, acquisition of data, revising the manuscript. TY contributed to interpretation of data, revising the manuscript. YT contributed to acquisition of funding, interpretation of data, revising the manuscript.

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Correspondence to Daisuke Noto.

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Noto, D., Ohie, K., Yoshida, T. et al. Optical spinning rheometry test on viscosity curves of less viscous fluids at low shear rate range. Exp Fluids 64, 18 (2023). https://doi.org/10.1007/s00348-022-03561-z

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  • DOI: https://doi.org/10.1007/s00348-022-03561-z

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