Numerical simulation and experimental investigation of submersible sewage mixer performance

Błoński, Dominik; Szulc, Piotr; Machalski, A.; Rogula, J.

doi:10.1088/1742-6596/1741/1/012007

Cited by 3 publications

(1 citation statement)

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“…The cone angle is approximately 2π/15 radians. The third area is the diffusion area, where momentum loss occurs and the velocity field tends to be unified (Błoński et al, 2021).…”

Section: Single-phase Flowmentioning

confidence: 99%

Review of Numerical Simulation Research on Submersible Mixer for Sewage

et al. 2022

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Submersible mixer is the core machinery of sewage treatment, which has a profound effect on the efficiency and performance of the submersible mixing system of sewage treatment. This paper summarizes the scientific research results of submersible mixer in recent years from four aspects: structure and energy characteristics of submersible mixer, numerical simulation calculation method, flow field characteristics, and factors affecting the flow field characteristics. The existing published literature indicates that the structure of submersible mixer for sewage is complicated and the parameters of energy characteristics are special. Few experimental studies are conducted, and mostly numerical calculations are based on clear water as the medium. The mixture model based on the Euler–Euler method is the multiphase flow model currently applied in the field of submersible mixer research. Many factors affect the mixing effect of a submersible mixer, such as installation factors (the location and angle of installation) and impeller design parameters (blade gap, hub-tip ratio, blade angle, etc.), all having a significant impact on the mixing performance. Meanwhile, the development and trends of submersible mixer technology are prospected, and the future directions of further research are proposed: establishing a more suitable numerical calculation method for submersible mixer based on the Euler–Lagrange model; constructing the calculation model with real fluid—solid-liquid two-phase flow as the medium; exploring the influence of various parameters on flow field characteristics of mixing fluid; getting the mixing mechanism of submersible mixer; promoting the development of submersible mixer; and realizing the efficient and stable operation of submerged mixing system.

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“…The cone angle is approximately 2π/15 radians. The third area is the diffusion area, where momentum loss occurs and the velocity field tends to be unified (Błoński et al, 2021).…”

Section: Single-phase Flowmentioning

confidence: 99%

Review of Numerical Simulation Research on Submersible Mixer for Sewage

et al. 2022

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The 3-D optimization of an axial mixer propeller through high fidelity simulations

Kozaka,

Demircioglu,

Bogrekci

et al. 2023

THERM SCI

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Homogeneous mixing is an important process quality indicator in biogas fermenters for introducing fresh organic feed material to certain bacteria groups such as methanogenic bacteria for anaerobic digestion. Energy consumption for mixing processes is one of the highest operational costs in biogas plants. Thus, it is crucial to carefully consider the energy expenditure per generated thrust (the first performance metric of an axial mixer) for a biogas mixer, since biogas plants are considered as a net carbon zero energy plant. There are several different types of mixers. Axial mixers both high speed and low speed together with paddle mixers are most common among various types of mixers used in fermenter tanks. In this study it is planned to improve conventional axial biogas mixer efficiency using computer aided engineering tools for design and optimization. This goal will be achieved by using a parametric design strategy for blade geometry together with the open source CFD analysis suite OpenFOAM for measuring performance metrics (i.e. power, torque, and thrust). The most efficient design will be chosen from a set of design candidates residing inside a reasonably large parametric state space, via maximizing the thrust to power ratio.

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Optimization of Liquid−Liquid Mixing in a Novel Mixer Based on Hybrid SVR-DE Model

et al. 2023

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To solve the problem of evenly mixing flocculant and sewage, a new type of two-chamber mechanical pipe mixer was numerically calculated and its working principle was studied by means of the internal flow field. The single factor numerical simulation and analysis of some of the structural parameters in the mixer were carried out to determine the influence of different parameters on the results. Latin hypercube sampling was used to design 100 sets of test tables for the four variables of the branch pipe diameter, sewage flow rate, the installation height of the impeller, and the angle of the deflector. The results were optimized using the SVR-DE algorithm. After optimization, the variation coefficient of export flocculant mixing uniformity was 16.02%, which was increased by 74.94% compared with the initial 63.921%. The power consumption of the impeller was reduced by 8.30%. The concentration curves of the flocculant at different positions of the outlet tube could quickly converge to the target value.

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Numerical simulation and experimental investigation of submersible sewage mixer performance

Cited by 3 publications

References 1 publication

Review of Numerical Simulation Research on Submersible Mixer for Sewage

Review of Numerical Simulation Research on Submersible Mixer for Sewage

The 3-D optimization of an axial mixer propeller through high fidelity simulations

Optimization of Liquid−Liquid Mixing in a Novel Mixer Based on Hybrid SVR-DE Model

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