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Shear Stress Measurements of Non-Spherical Particles in High Shear Rate Flows

Koos, Erin and Hunt, Melany L. and Brennen, Christopher E. (2008) Shear Stress Measurements of Non-Spherical Particles in High Shear Rate Flows. In: International Congress on Rheology, XV: The Society of Rheology 80th Annual Meeting, Monterey, CA, 3–8 August 2008. AIP Conference Proceedings. No.1027. American Institute of Physics , Melville, NY, pp. 740-742. ISBN 978-0-7354-0549-3.

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The behavior of liquid-solid flows varies greatly depending on fluid viscosity; particle and liquid inertia; and collisions and near-collisions between particles. Shear stress measurements were made in a coaxial rheometer with a height to gap ratio (b/r0) of 11.7 and gap to outer radius ratio (h/b) of 0.166 that was specially designed to minimize the effects of secondary flows. Experiments were performed for a range of Reynolds numbers, solid fractions and ratio of particle to fluid densities. With neutrally buoyant particles, the dimensional shear stress exhibits a linear dependence on Reynolds number: the slope is monotonic but a non-linear function of the solid fraction. Though non-neutrally buoyant particles exhibit a similar linear dependence at higher Reynolds numbers, at lower values the shear stress exhibits a non-linear behavior in which the stress increases with decreasing Reynolds number due to particle settling.

Item Type:Book Section
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Hunt, Melany L.0000-0001-5592-2334
Additional Information:©2008 American Institute of Physics. Issue Date: 7 July 2008. This research was supported though the generous support of NASA (NNC04GA48G) and the NSF (CBET-0730284).
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Subject Keywords:shear flow, rheology, suspensions
Series Name:AIP Conference Proceedings
Issue or Number:1027
Record Number:CaltechAUTHORS:KOOaipcp08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11176
Deposited By: Archive Administrator
Deposited On:22 Jul 2008 03:12
Last Modified:08 Nov 2021 21:33

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