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- Title
Flow characteristics of the new type of mixer in wastewater treatment.
- Authors
Fei Tian; Weidong Cao; Xiaoli Dai; Mingxiong Ou
- Abstract
This paper studies the flow field of a new type of submersible mixer with two impellers and six blades in the wastewater treatment pool by using large-scale software, such as Pro/engineering, FLUENT 15.0 and ICEM. After that, it numerically simulates the wastewater treatment pool using the RNG k-ε turbulent model and the mobile coordinate measuring system, and analyzes the macro fluid field and flow field distribution of the sections. The fluid in the wastewater treatment pool can be propelled by the new type of mixer, and the fluid flows along the axial direction of the submersible mixer and diffuses radially. Eight water and sludge cycles are formed in the pool, and the fluid in the pool forms two high-flow region and eight low-flow regions. The velocity distribution in the pool is distributed symmetrically along the plane Z=0m and the plane X=1.75m. As the new type of mixer is installed close to the bottom of the pool, the position with the maximum velocity offsets gradually to the bottom of the pool with the increasing distance to the impeller. The new type of mixer is different from the traditional submersible mixer, in that the fluid mixed by the new one can circulate fully on both sides of the submersible mixer. Consequently, this new type of submersible mixer can mix more fluid, and there will be a smaller dead zone in the whole pool with less sludge at the bottom. This simulation method can guide the application of mixers in the practical wastewater treatment.
- Subjects
WASTEWATER treatment; FLUID flow; VELOCITY distribution (Statistical mechanics); HYDRAULIC engineering; FLUID dynamics
- Publication
International Journal of Heat & Technology, 2018, Vol 36, Issue 3, p913
- ISSN
0392-8764
- Publication type
Article
- DOI
10.18280/ijht.360318