Computational and experimental investigation of laminar flow mixing system in a pitched-blade turbine stirred tank

Cui, Yanyan; Zhang, Huabo; Li, Xiwen; Yang, Mengqing; Guan, Zailin

doi:10.25165/j.ijabe.20181104.2729

Cited by 3 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Haider and Levenspiel (HL) [26] studied the drag coefficient and terminal velocity of spherical and non-spherical particles shaped as isometric like cube octahedrons, octahedrons, cubes, tetrahedrons and thin free-falling disks. They derived the equation of drag coefficient related to the particle Reynolds number and sphericity , see Equation (8). Hölzer and Sommerfeld (HS) [30] proposed a drag model for nonspherical particles (Equation ( 9)) based on the existing drag models.…”

Section: R F Pmentioning

confidence: 99%

“…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%

See 1 more Smart Citation

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

Yang¹,

Zhu²

2023

International Journal of Agricultural and Biological Engineering

View full text Add to dashboard Cite

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.

show abstract

Section: R F Pmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…When the studies on these parameters are examined, it has been seen that the undesired vortexes in the tank can be prevented by the baffles added to the inner walls of the tank (Rezend, 1996;Missen et al, 1999). Cui et al experimentally and numerically investigated the mixing process for laminar flow in pitched-blade turbine stirred tanks (Cui et al, 2018). They concluded that the impeller diameter was the parameter that most influenced the mixing time.…”

Section: Introductionmentioning

confidence: 99%

Karıştırıcılı Ceket Tip Isı Değiştiricilerin Isıl Davranışlarının Deneysel ve Sayısal Olarak İncelenmesi

BAYRAM,

SEVİLGEN,

CESUR

2023

UUJFE

View full text Add to dashboard Cite

In this study, the thermal performance of a jacketed heat exchanger with a stirrer was experimentally and numerically investigated under different jacket side water inlet temperature and flow rate conditions. In the numerical study, a three-dimensional computational fluid dynamics (CFD)model of the heat exchanger was generated and the analyzes were performed with the ANSYS-Fluent software package. In addition, a stirrer was added to both the experimental and the numerical study to obtain the effects of the stirrer on the temperature and velocity values of the water in the tank. It was seen that the results of the analyzes performed under similar conditions to the experimental study were in good agreement with the experimental study. It was concluded that the effect of the flow rate decreases with increasing inlet temperature. When the stirrer was activated and the flow rate was increased from 0.5 to 2.5 l/min in 30, 40, and 50°C inlet temperature conditions, the time to reach the target temperature inside the tank decreased from approximately 1600 to 900, from 2500 to 1350, and from 4900 to 1400, respectively. In general, it was observed that the effect of the stirrer increased with increasing inlet temperature in all flow rate conditions.

show abstract

CFD Study on the Flow Field and Power Characteristics in a Rushton Turbine Stirred Tank in Laminar Regime

Chen

Ke-feng

et al. 2019

International Journal of Chemical Reactor Engineering

View full text Add to dashboard Cite

A computational fluid dynamics (CFD) simulation was performed to study the hydrodynamics characteristics in a Rushton turbine stirred tank in laminar regime. The effects of operating condition, working medium and geometrical parameter on the flow field and power number characteristics were investigated. It is found that the two-loop flow pattern is formed in laminar regime when the impeller is not very close to tank bottom, while its shape and size vary with Reynolds number and impeller diameter. For a given geometrical configuration, the flow pattern, power number and dimensionless velocity profile are mainly depended on Reynolds number, and do not change with working medium and scale-up for a constant Reynolds number. When impeller off-bottom clearance is too low and Reynolds number is relatively high, the fluid flow would transit from two-loop flow pattern to sing-loop flow pattern as that occurs in turbulent regime. Power number falls for larger impeller in laminar regime. Surprisingly, in laminar regime, power number in the baffled tank with small impeller is almost identical to that in the unbaffled tank.

show abstract

Computational and experimental investigation of laminar flow mixing system in a pitched-blade turbine stirred tank

Cited by 3 publications

References 1 publication

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

Karıştırıcılı Ceket Tip Isı Değiştiricilerin Isıl Davranışlarının Deneysel ve Sayısal Olarak İncelenmesi

CFD Study on the Flow Field and Power Characteristics in a Rushton Turbine Stirred Tank in Laminar Regime

Contact Info

Product

Resources

About