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CFD simulation of non-Newtonian fluid flow in anaerobic digesters

✍ Scribed by Binxin Wu; Shulin Chen

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
361 KB
Volume
99
Category
Article
ISSN
0006-3592

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✦ Synopsis

Abstract

A general mathematical model that predicts the flow fields in a mixed‐flow anaerobic digester was developed. In this model, the liquid manure was assumed to be a non‐Newtonian fluid, and the flow governed by the continuity, momentum, and k‐ε standard turbulence equations, and non‐Newtonian power law model. The commercial computational fluid dynamics (CFD) software, Fluent, was applied to simulate the flow fields of lab‐scale, scale‐up, and pilot‐scale anaerobic digesters. The simulation results were validated against the experimental data from literature. The flow patterns were qualitatively compared for Newtonian and non‐Newtonian fluids flow in a lab‐scale digester. Numerical simulations were performed to predict the flow fields in scale‐up and pilot‐scale anaerobic digesters with different water pump power inputs and different total solid concentration (TS) in the liquid manure. The optimal power inputs were determined for the pilot‐scale anaerobic digester. Some measures for reducing dead and low velocity zones were proposed based upon the CFD simulation results. Biotechnol. Bioeng. 2008;99: 700–711. © 2007 Wiley Periodicals, Inc.

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