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Engineering properties of solid and semi-solid livestock manure as related to the modeling of machine-product interactions in handling and land application equipment

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  032260,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14967) @2003
Authors:   Hubert Landry, Claude Laguë, Martin Roberge
Keywords:   Handling, Land application, Manure, Physical properties, Rheological properties, Modeling

Selected physical and rheological properties of dairy cattle, sheep, poultry and pig manure have been measured at total solids concentration (TS) levels ranging from 10 to 50% on a wet mass basis. The measured properties included bulk density, particle size distribution, friction characteristics and shearing behavior. The bulk density of all manure products was found to increase with TS and the values for poultry and pig manure were not significantly different at the tested TS levels. The proposed modified geometric mean length of the particles was found to significantly increase as TS became smaller. The static friction coefficients of all manure types with the exception of pig manure over the different surface materials (plywood, plastic, steel (bare and painted)) did not exhibit large differences and a single linear equation was suggested to predict the static friction coefficient as a function of TS. Animal manures were described as pseudoplastic fluids and the consistency coefficients were found to increase with TS for all manure types. The apparent viscosity of the tested manure products was well correlated to TS. The properties database will be used to model machineproduct interactions taking place in manure handling and land application equipment. The Distinct Element Method (DEM) has been selected to study the flow of manure in such machines. Preliminary interaction models are presented.

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