Abstract

Mahboobeh Pishnamazi¹, Azam Marjani², Saeed Shirazian²* and Mohammad Samipurgiri³

This paper presents mathematical modeling and numerical simulation of hydrodynamics of a mixer used for wastewater treatment. The simulation is based on solving conservation equations for mixer. Swirl flow is considered for flow behavior in the mixer. The geometry of mixer was divided in to subdomains including fixed and mobile parts. Impeller was considered as mixing device. The model equations are solved by using computational fluid dynamics (CFD) techniques. Velocity distributions were obtained through solving the governing equations. The simulations results showed that there are some dead zones which reduce the efficiency of the mixing process. The modeling findings also revealed that velocity of impeller is a key parameter for increasing mixing efficiency.

Mixer; Wastewater treatment; CFD; Simulation; Modeling

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