Mixing Characteristics and Parameter Effects on the Mixing Efficiency of High-Viscosity Solid–Liquid Mixtures under High-Intensity Acoustic Vibration

Zhan, Xueying; Yu, Long; Jiang, Yalong; Jiang, Qin; Shi, Tielin

doi:10.3390/pr11082367

Cited by 2 publications

(3 citation statements)

References 41 publications

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“…Because the model is a solid-fluid multiphase model, it needs to account for forces acting on the particles, such as drag force and gravity force, whether in solid-gas or solid-liquid interactions, as investigated by Brazhenko et al [23]. Furthermore, drag force remains a key consideration in the gas-solid-liquid model investigated by Zhan et al [24], as well as in the CSTR model by Kou et al [25]. From Figure 5b, the increased diameter beyond the reaction zone resulted in a decrease in gas velocity.…”

Section: Model Validationmentioning

confidence: 99%

Effect of Inserting Baffles on the Solid Particle Segregation Behavior in Fluidized Bed Reactor: A Computational Study

Kreesaeng,

Chalermsinsuwan,

Piumsomboon

2024

ChemEngineering

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In multi-solid, particle-size fluidized bed reactor systems, segregation is commonly observed. When segregation occurred, small solid particles were entrained to the top of the bed and escaped from the reactor. During the combustion process, the small solid particles that escaped from the boiler were burned and subjected to damage around the cyclone separator. This study then employed a computational fluid dynamics approach to investigate solid particle behavior in the reactor using three different sizes of solid particles. The effects of baffle insertion, baffle angle, stage number, and its arrangement were examined. The percentage of segregation was calculated to compare behavior among different reactor systems. The insertion of 45-degree baffles resulted in reduced segregation behavior compared to cases without baffles and with 90-degree baffles, attributed to solid hindering and collision phenomena. Additionally, a double-stage baffle with any arrangement could reduce segregation behavior. The best arrangement was “above-arrangement” due to particles hindering, swirling, and accumulating between the baffle stages. Therefore, to diminish segregation behavior and enhance combustion chemical reactions, the insertion of baffles in the reactor zone is recommended.

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Section: Model Validationmentioning

confidence: 99%

Effect of Inserting Baffles on the Solid Particle Segregation Behavior in Fluidized Bed Reactor: A Computational Study

Kreesaeng,

Chalermsinsuwan,

Piumsomboon

2024

ChemEngineering

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“…In this configuration, of the single screw lies on the trajectory of the output shaft, as represented by po Figure 2. The output shaft undergoes simultaneous revolution and self-rotation site directions at equal speeds, fulfilling the condition for the epitrochoid 1 O to pure rolling within the stator. Consequently, the trajectory of the single-screw straight line, with a distance of 4 e from the center of rotation.…”

Section: Number Of Turns Longitudinalmentioning

confidence: 99%

“…In the food industry, numerous materials fall under the category of high-viscosity liquids. During the mixing and dispersing stage, the composite material matrix predom-inantly consists of high-viscosity fluids exhibiting nonlinear viscoelastic laminar flow, posing challenges to achieving uniform material distribution [1]. Any instances of agglomeration or uneven distribution within the matrix can compromise product performance [2], resulting in unstable product quality and serving as a technical bottleneck for the food industry's advancement [3].…”

Section: Introductionmentioning

confidence: 99%

Kinematics-Based Design Method and Experimental Validation of Internal Meshing Screw for High-Viscosity Fluid Mixing

Guo,

Liu,

Hao

et al. 2024

Applied Sciences

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The challenge of mixing high-viscosity materials is a common issue encountered in the manufacturing process of food materials. The advantages of the internal meshing screw mixer have led to its adoption in various manufacturing processes, but it has yet to be implemented in the food industry. The paper presents a design method for an internal meshing screw mixer based on kinematic principles. The mixer features a helical chamber created by alternating volumes formed by the stator and rotor, establishing an extension-dominated environment for mixing high-viscosity fluids. A kinematic model based on the internal cycloid principle was established, providing trajectories and equations for key points on the rotor, simulating both its rotation and revolution processes, and revealing the velocity variations at different points on the rotor. Based on the kinematic analysis results, a stator and rotor design method was developed according to relevant functional divisions. To achieve the desired motion effects, transmission and support devices were designed, and the relationship between the transmission device and the internal cycloid surface of the fixed rotor was established. The mixer’s application and mixing effectiveness in the food industry were validated using corn syrup and flour. Experimental results showed that the extensional mixer described in the paper effectively mixed high-viscosity fluids while also efficiently blending fine powders. Slurry viscosity was tested with a rheometer at different speeds with an eccentric rotor mixer. Results showed that viscosity decreased with increasing shear rate, with a more pronounced decrease at higher shear rates. The apparent viscosity trend remained consistent at different speeds, although variations were observed at lower shear rates, especially concerning speed. The non-Newtonian fluid index exhibited minimal variations at different speeds, while the consistency coefficient showed significant fluctuations. The mixing uniformity index of the slurry was used to evaluate the mixing uniformity and dispersion uniformity of this extensional mixer. At different rotational speeds, the density of the slurry changes little. The uniformity index of mixing decreases gradually with the increase of rotational speed, reaching its maximum at 15 r/min. The overall trend of the uniformity index decreases with increasing rotational speed, indicating a decrease in density uniformity. A peak appears at 45 r/min, possibly due to the maximum values of elongation rate and shear rate at this speed. As the rotational speed increases, the residence time of the material in the mixer decreases, which may be the main reason for the decrease in mixing uniformity. These findings provide valuable insights into the design and utilization of extension-dominated screw mixers within the food industry, laying a solid foundation for future research and practical applications in this field.

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Mixing Characteristics and Parameter Effects on the Mixing Efficiency of High-Viscosity Solid–Liquid Mixtures under High-Intensity Acoustic Vibration

Cited by 2 publications

References 41 publications

Effect of Inserting Baffles on the Solid Particle Segregation Behavior in Fluidized Bed Reactor: A Computational Study

Effect of Inserting Baffles on the Solid Particle Segregation Behavior in Fluidized Bed Reactor: A Computational Study

Kinematics-Based Design Method and Experimental Validation of Internal Meshing Screw for High-Viscosity Fluid Mixing

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