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Numeric Simulation‐Based Analysis of the Mixing Process in Anaerobic Digesters of Biogas Plants
Author(s) -
Conti Fosca,
Saidi Abdessamad,
Goldbrunner Markus
Publication year - 2020
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201900650
Subject(s) - mixing (physics) , biogas , radius , mechanics , turbulence , computational fluid dynamics , reynolds number , rheology , rotational speed , newtonian fluid , environmental science , engineering , marine engineering , materials science , mechanical engineering , physics , thermodynamics , waste management , computer science , computer security , quantum mechanics
Stirring systems with two rotational three‐bladed propellers were analyzed using computational fluid dynamics. The propellers are located at three heights and seven angles in a tank with 9 m radius. The fluid was characterized by non‐Newtonian rheology and simulated by applying the k‐ε turbulence model and the standard k‐ω model. Reynolds numbers were estimated. High fluid speeds were obtained with the propellers located at a height of 2 m and oriented at 90° with respect to the tank radius. In the top regions of the tank, the fluid velocity was generally less intense and less affected by the angle setting. The configurations identified as good mixing systems showed power consumptions broadly distributed around 30 kW.