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Collisional Particle Pressure Measurements in Solid-Liquid Flows

Zenit, R. and Hunt, M. L. and Brennen, C. E. (1997) Collisional Particle Pressure Measurements in Solid-Liquid Flows. Journal of Fluid Mechanics, 353 . pp. 261-283. ISSN 0022-1120.

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Experiments were conducted to measure the collisional particle pressure in both cocurrent and countercurrent flows of liquid-solid mixtures. The collisional particle pressure, or granular pressure, is the additional pressure exerted on the containing walls of a particulate system due to the particle collisions. The present experiments involve both a liquid-fluidized bed using glass, plastic or steel spheres and a vertical gravity-driven flow using glass spheres. The particle pressure was measured using a high-frequency-response flush-mounted pressure transducer. Detailed recordings were made of many different particle collisions with the active face of this transducer. The solids fraction of the flowing mixtures was measured using an impedance volume fraction meter. Results show that the magnitude of the measured particle pressure increases from low concentrations (>10% solid volume fraction), reaches a maximum for intermediate values of solid fraction (30-40%), and decreases again for more concentrated mixtures (>40%). The measured collisional particle pressure appears to scale with the particle dynamic pressure based on the particle density and terminal velocity. Results were obtained and compared for a range of particle sizes, as well as for two different test section diameters. In addition, a detailed analysis of the collisions was performed that included the probability density functions for the collisoin duration and collision impulse. Two distinct contributions to the collisional particle pressure were identified: one contribution from direct contact of particles with the pressure transducer, and the second one resulting from particle collisions in the bulk that are transmitted through the liquid to the pressure transducer.

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Hunt, M. L.0000-0001-5592-2334
Additional Information:Received 5 February 1997 and in revised form 29 August 1997. The authors are grateful to Professor Charles Campbell for helpful discussions and suggestions. The National Council for Science and Technology of Mexico (CONACYT) is acknowledged for partially supporting R. Zenit during his graduate sojourn at the California Institute of Technology. "Reprinted with the permission of Cambridge University Press."
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:176
Deposited By: Christopher Brennen
Deposited On:09 Nov 2004
Last Modified:09 Mar 2020 13:18

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