Effect of impeller on sinking and floating behavior of suspending particle materials in stirred tank: A computational fluid dynamics and factorial design study

Yuan, Zhang; Yu, Guangren; Siddhu, Muhammad Abdul Hanan; Masroor, Abro; Ali, Muhammad; Abdeltawab, Ahmed A.; Chen, Xiaochun

doi:10.1016/j.apt.2017.02.002

Cited by 17 publications

(8 citation statements)

References 37 publications

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“…Whether it is gas mixing [7] or mechanical mixing [8] , the appropriate mixing of biomass particles needs to be solved to improve anaerobic digestion [9] . Computational fluid dynamics (CFD) simulation technology is a promising technique to study the mixing process between particles and fermentation fluids to optimize the agitator design [10][11][12] by visualizing the mixing process with simulation.…”

Section: Introductionmentioning

confidence: 99%

Fluid-solid drag models selection for simulating wheat straw particle movement in anaerobic digester

Yang¹,

Zhu²

2023

International Journal of Agricultural and Biological Engineering

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Computational fluid dynamics (CFD) has been utilized to simulate the movements of wheat straw particles for agitator speed selection in full-scale wet digestion. Previous research has found that the current drag model generally used for depicting the motion of spherical particles cannot match the movement behavior of wheat straw particles with their nonspherical shape. In this study, the sedimentation experiment and horizontal flow experiment of straw particles were determined using a V20-3D camera and a micro Particle Image Velocimetry (PIV) system. With analyses of the experimental data and CFD simulation results, the prediction accuracies of the non-spherical drag models of Hölzer and Sommerfeld (HS), Kishore and Gu (KG), Haider and Levenspiel (HL), Richter and Nikrityuk (RN), and Fabio Dioguardi (FD) were evaluated by the motion of individual straw particles. The results showed that the KG model has a significant advantage over the other drag models, both simulating the particle settling velocities in a one dimensional settling experiment and simulating the predictable trajectory in a two-dimensional horizontal flow experiment. Therefore, the KG drag model was selected to simulate with CFD the wheat straw particle movement to select agitator speeds. Additionally, the realizable k-turbulence model was proven to be superior to the other turbulence models for simulating the continuous phase flow with CFD.

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Section: Introductionmentioning

confidence: 99%

Fluid-solid drag models selection for simulating wheat straw particle movement in anaerobic digester

Yang¹,

Zhu²

2023

International Journal of Agricultural and Biological Engineering

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“…may have an obvious influence on the solid–liquid two-phase flow simulation. Through literature research, it was found that the drag force plays the leading role among interphase forces when ρ s /ρ l > 2, and other forces can be neglected. , The coefficient of momentum exchange was computed by using the Gidaspow model. − …”

Section: Numerical Methodologymentioning

confidence: 99%

Investigation on Solid Particles and Pseudoplastic Fluid Mixing Characteristics in a Dislocated Self-Similarity Impeller Stirred Reactor

Wang

Yang

et al. 2023

Ind. Eng. Chem. Res.

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A dislocated self-similarity impeller (DS impeller) was introduced in the solid particles and pseudoplastic fluid mixing process. The investigation on the mixing performance of a dislocated pitched-blade impeller (DPB impeller) and a DS impeller was conducted by applying experimental and computational fluid dynamics simulation. Results showed that the DS impeller could enlarge cavern zones and improve the uniformity of solid particle distribution compared with the DPB impeller at an equivalent power consumption (P), and these effects could be further enhanced by increasing the self-similar iteration number of the DS impeller. Meanwhile, the DS impeller could decompose trailing vortices into smaller ones, destroy the recirculation zone, consume less power consumption (P), and decrease the power number (N p ) through the self-similar structure design of impeller blades, and the impeller energy utilization rate of the DS impeller could be improved by increasing the self-similar iteration number. The DS-2 impeller reduced about 40.56 and 13.50% of power consumption compared with those of the DPB impeller and DS-1 impeller at Re y = 236, respectively. This indicated that the implementation of a self-similar structure design for impeller blades could effectually enlarge the well-mixed regions and improve the mixing effectiveness in the solid particles and pseudoplastic fluid mixing process, and with a greater effect obtained as the number of self-similar iterations increased.

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“…The E–E method treats the solid particle mathematically as a continuous phase considering the interpenetration and interaction of the solid and liquid phases [ 41 ]. This method has been widely employed by scholars due to the relatively low requirements of computing resources and it was validated by comparing the computational results to the experimental results [ 10 , 30 , 42 , 43 ]. Turbulence effects are important for solid-liquid mixing processes and need to be considered in the creating of mathematical models.…”

Section: Introductionmentioning

confidence: 99%

“…Siddiqui et al [ 44 ] also demonstrated the RNG k–ε model can fairly predict the velocity contours and streamlines. Based on the E–E model along with the RNG k–ε turbulence model, scholars have conducted multiple verification work by comparing the simulation data with the experimental results and a large amount of work on multiphase mixing operations ([ 30 , 43 ]).…”

Section: Introductionmentioning

confidence: 99%

Turbulent CFD Simulation of Two Rotor-Stator Agitators for High Homogeneity and Liquid Level Stability in Stirred Tank

Yin

Zheng

et al. 2022

Materials

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Good solid-liquid mixing homogeneity and liquid level stability are necessary conditions for the preparation of high-quality composite materials. In this study, two rotor-stator agitators were utilized, including the cross-structure rotor-stator (CSRS) agitator and the half-cross structure rotor-stator (HCSRS) agitator. The performances of the two types of rotor-stator agitators and the conventional A200 (an axial-flow agitator) and Rushton (a radial-flow agitator) in the solid-liquid mixing operations were compared through CFD modeling, including the homogeneity, power consumption and liquid level stability. The Eulerian–Eulerian multi-fluid model coupling with the RNG k–ε turbulence model were used to simulate the granular flow and the turbulence effects. When the optimum solid-liquid mixing homogeneity was achieved in both conventional agitators, further increasing stirring speed would worsen the homogeneity significantly, while the two rotor-stator agitators still achieving good mixing homogeneity at the stirring speed of 600 rpm. The CSRS agitator attained the minimum standard deviation of particle concentration σ of 0.15, which was 42% smaller than that achieved by the A200 agitators. Moreover, the average liquid level velocity corresponding to the minimum σ obtained by the CSRS agitator was 0.31 m/s, which was less than half of those of the other three mixers.

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Effect of impeller on sinking and floating behavior of suspending particle materials in stirred tank: A computational fluid dynamics and factorial design study

Cited by 17 publications

References 37 publications

Fluid-solid drag models selection for simulating wheat straw particle movement in anaerobic digester

Fluid-solid drag models selection for simulating wheat straw particle movement in anaerobic digester

Investigation on Solid Particles and Pseudoplastic Fluid Mixing Characteristics in a Dislocated Self-Similarity Impeller Stirred Reactor

Turbulent CFD Simulation of Two Rotor-Stator Agitators for High Homogeneity and Liquid Level Stability in Stirred Tank

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