Stirring systems with two rotational 3-bladed propellers were analyzed using computational fluid dynamic. The propellers are located at 3 heights and 7 angles in a tank with radius of 36 m. A fluid volume of 1400 m3 was considered. 441 mixing configurations were evaluated. The fluid was characterized by non-Newtonian rheology and was simulated using 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.
Numeric simulation-based analysis of the mixing process in anaerobic digesters of biogas plants
Fosca Conti
;
2020
Abstract
Stirring systems with two rotational 3-bladed propellers were analyzed using computational fluid dynamic. The propellers are located at 3 heights and 7 angles in a tank with radius of 36 m. A fluid volume of 1400 m3 was considered. 441 mixing configurations were evaluated. The fluid was characterized by non-Newtonian rheology and was simulated using 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.Pubblicazioni consigliate
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