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Direct measurement of wall slip and slip layer thickness of non-Brownian hard-sphere suspensions in rectangular channel flows

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Abstract

Wall slip is a long-known phenomenon in the field of rheology. Nevertheless, the origin and the evolution are not completely clear yet. Regarding suspensions, the effect becomes even more complicated, because different mechanisms like pure slip or slip due to particle migration have to be taken into account. Furthermore, suspensions themselves show many flow anomalies and the isolation of slip is complicated. In order to develop working physical models, further insight is necessary. In this work, we measured experimentally the wall slip velocities of different highly filled suspensions in a rectangular slit die directly with respect to the particle concentration and the particle size. The slip velocities were obtained using a particle image velocimetry (PIV) system. The suspensions consisting of a castor oil–cinnamon oil blend and PMMA particles were matched in terms of refractive indexes to appear transparent. Hereby, possible optical path lengths larger than 15 mm were achieved. The slip velocities were found to be in a quadratic relation to the wall shear stress. Furthermore, the overall flow rate as well as the particle concentration has a direct influence on the slip. Concerning the shear stress, there seem to be two regions of slip with different physical characteristics. Furthermore, we estimated the slip layer thickness directly from the velocity profiles and propose a new interpretation. The PIV technique is used to investigate the viscosity and implicit the concentration profile in the slit die. It is shown that the particle migration process is quite fast.

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Authors and Affiliations

  1. Paderborn University, Warburger Straße 100, 33098, Paderborn, Germany

    Steffen Jesinghausen, Rene Weiffen & Hans-Joachim Schmid

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  1. Steffen Jesinghausen
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  2. Rene Weiffen
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  3. Hans-Joachim Schmid
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Correspondence to Steffen Jesinghausen.

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Jesinghausen, S., Weiffen, R. & Schmid, HJ. Direct measurement of wall slip and slip layer thickness of non-Brownian hard-sphere suspensions in rectangular channel flows. Exp Fluids 57, 153 (2016). https://doi.org/10.1007/s00348-016-2241-6

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  • DOI: https://doi.org/10.1007/s00348-016-2241-6

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