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High shear microfluidics and its application in rheological measurement

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Abstract

High shear rheology was explored experimentally in microchannels (150×150 μm). Two aqueous polymer solutions, polyethylene oxide (viscoelastic fluid) and hydroxyethyl cellulose (viscous fluid) were tested. Bagley correction was applied to remove the end effect. Wall slip was investigated with Mooney’s analysis. Shear rates as high as 106 s−1 were obtained in the pressure-driven microchannel flow, allowing a smooth extension of the low shear rheological data obtained from the conventional rheometers. At high shear rates, polymer degradation was observed for PEO solutions at a critical microchannel wall shear stress of 4.1×103 Pa. Stresses at the ends of the microchannel also contributed to PEO degradation significantly.

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Authors and Affiliations

  1. Department of Chemical Engineering, The Ohio State University, 140 West 19th Avenue, Columbus, OH, 43210, USA

    Kai Kang, L. James Lee & Kurt W. Koelling

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  1. Kai Kang
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  2. L. James Lee
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  3. Kurt W. Koelling
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Correspondence to Kurt W. Koelling.

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Kang, K., Lee, L.J. & Koelling, K.W. High shear microfluidics and its application in rheological measurement. Exp Fluids 38, 222–232 (2005). https://doi.org/10.1007/s00348-004-0901-4

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  • DOI: https://doi.org/10.1007/s00348-004-0901-4

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