Abstract：
:An impact method was applied to investigate the rheological characteristics of digested sludge and reveal its transient dynamics. A high-speed camera allowed visualizing the dynamic impact process and observing interaction between impacting sphere and targeted sludge. A damping oscillation was observed after the impact. The crater diameter followed an exponential function, while the crater depth varied as a logarithmic function of both sphere diameter and free fall height. Furthermore, the viscosity and elasticity of digested sludge were evaluated by establishing a simplified impact drag force model. The impact elastic modulus was consistent with the Young's modulus measured by a penetrometer. The impact viscosity was reasonable as the estimated impact shear stress was greater than the yield stress of digested sludge resulting in the formation of crater. The impact method offers an alternative way to reveal the viscoelasticity of digested sludge through a dynamic process.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Jiang J,Wu J,Poncin S,Li HZdoi
10.1016/j.biortech.2016.06.101subject
Has Abstractpub_date
2016-10-01 00:00:00pages
301-6eissn
0960-8524issn
1873-2976pii
S0960-8524(16)30918-Xjournal_volume
218pub_type
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