How Fluid Pseudoplasticity and Elasticity Affect Propeller Flows in Biogas Fermenters

Author:

Kolano Markus1,Ohnmacht Benjamin2,Lemmer Andreas2,Kraume Matthias1

Affiliation:

1. Technische Universität Berlin Fachgebiet Verfahrenstechnik Ackerstr. 76 13355 Berlin Germany

2. Universität Hohenheim Landesanstalt für Agrartechnik und Bioenergie Garbenstr. 9 70599 Stuttgart Germany

Abstract

AbstractMixing in biogas fermenters is complex due to the non‐Newtonian rheology of biogenic substrates, which exhibit both pseudoplasticity and elasticity. It is yet unclear how these non‐Newtonian properties affect propeller flows and the mixing behavior in fermenters. Therefore, propeller flows in Newtonian as well as shear‐thinning inelastic and elastic fluids are compared numerically and validated against particle image velocity (PIV) data. Elastic normal stresses lead to an increase of pumping rates in the laminar regime and a suppression of the formation of a propeller jet in the transitional regime. Thus, flow rates are severely overestimated by the inelastic, shear‐thinning model in this regime. The results indicate that elasticity is critical for an accurate modeling of flows of biogenic substrates.

Funder

Bundesministerium für Ernährung und Landwirtschaft

Publisher

Wiley

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