Understanding mixing tank performance and behavior is important for design, scale-up, optimization and troubleshooting. Simulation can provide valuable insight in these areas, including: Understanding mixing characteristics: flow visualization, residence and blend time. Prediction of shear rate, shear history and mass transfer rates.
Semantic Scholar extracted view of "CFD simulation and experimental analysis of solid-liquid mixing characteristics in a stirred tank with a self-similarity impeller" by Deyin Gu et al.
The efficient mixing process of pseudoplastic fluid stirred by 6PBT impeller is obtained with the considerably low mixing energy per unit volume when the stirrer off-bottom distance, C, is T/3 and ...
The hydrodynamics of fractal impeller in solid-liquid mixing process was studied by CFD simulation. • Fractal impeller can improve solid-liquid homogeneous degree. • Fractal impeller can reduce the power consumption. • Solid suspension quality increased with the increase of fractal iteration number of fractal impeller.
Download scientific diagram | CFD simulation of solid particles dispersions inside the stirred tank and mixing efficiencies compared in different mixer designs and operating conditions at 40 s at ...
Gu et al. [20] applied CFD simulation to optimize impeller speed, flexible connection piece length, impeller spacing and aperture size/ratio of punched rigid-flexible impeller in the solid-liquid mixing process with the Eulerian-Eulerian approach and standard k-ε turbulence model. Zhang et al. [21] applied CFD simulation to investigate …
Data obtained from numerical simulation enabled to calculate global mixing parameters, such as power number and impeller flow number. These data were compared with data found in literature. View
The goal of this article is to provide a method for simulating and analyzing impeller mixing and gas sparging in a bioreactor using multiphase computational fluid dynamics modeling. In particular, the oxygen transfer rate, ... The top impeller mesh from run 2 was used—except in simulation 3, which used the top impeller mesh from run 3.
Stirred bioreactors are commonly used unit operations in the pharmaceutical industry. In this study, computational fluid dynamics (CFD) was used in order to analyze the influence of the impeller configuration (Segment–Segment and Segment–Rushton impeller configurations) and the impeller rotational speed (an operational parameter) on the …
The turbulent flow field generated in a baffled stirred tank by a curved blade impeller has been investigated by employing large-eddy simulation (LES). The Smagorinsky-Lilly and kinetic energy transport model was used to model the unresolved, or subgrid, scales. The simulation has been validated by using available experimental …
Bingzhong et al. [ 7] conducted a numerical simulation study on the solid-liquid mixing process of a 3-layer staggered 45° tooth impeller power mixer, which clearly showed that the mixing power increased with the increase of solid particle size and rotational speed, and the effect of rotational speed on the mixing power was more obvious.
Amount of mixing percentage as a function of impeller speed and temperature Figure 5 shows amount of mixing percentage as a function of impeller speed and temperature for inlet velocity of 0.1 (m ...
An impeller is a rotating component designed to transfer energy from the motor to the fluid, increasing its velocity and pressure as it moves through the machine. A good impeller design ensures optimal fluid dynamics, minimizes energy losses, and contributes to the longevity of the turbomachinery equipment.
Abstract. Computational fluid dynamics (CFD) was employed to study mixing performance in high solid anaerobic digester (HSAD) with A-310 impeller and helical ribbon. A mathematical model was constructed to assess flow fields. Good agreement of the model results with experimental data was obtained for the A-310 impeller.
Liquid–liquid mixings in stirred tanks are commonly found in many industries. In this study, we performed computational fluid dynamics (CFD) modeling and simulation to investigate the liquid–liquid mixing …
Relation between the impeller design and mixing time. The effect of impeller design, blade pitch, blade width and blade twist were investigated on the mean and turbulence characteristics as well as mixing time. ... In this paper, we evaluate them within the emerging field of AI for simulation, where traditional numerical simulations are ...
The impeller rotation generates high-speed jets with a high flow velocity in the impeller region and low velocity in the upper and bottom of the mixing tank. The numerical simulation results are consistent with the PIV experimental results, which prove that the numerical model is reliable. The average flow field of the liquid phase.
ABSTRACT In this work, CFD simulations have been conducted to investigate flow behaviour of water in fully baffled stirred tank with Rushton turbine as impeller. The aim of the paper is to develop CFD model of such tank and optimize the dimensions of inner rotating fluid zone for MRF model. The best inner rotating fluid zone …
Through simulation tests, the effect of different blender forms, blade lengths and blade orientations on the Lacey mixing index (LMI) was studied, and the structural form of the blender was selected as the inclined blade-same-up impeller blender. Based on simulation tests, to verify the reliability of the simulation test and further determine ...
Numerical simulation of micro-mixing in gas-liquid and solid-liquid stirred tanks with the coupled CFD-E-model. Chin. J. Chem. Eng. (2020) ... CFD simulation of impeller shape effect on quality of mixing in two-phase gas–liquid agitated vessel. Chinese Journal of Chemical Engineering, Volume 28, Issue 11, 2020, pp. 2733-2745 ...
The dual shaft mixer strengthened the hydrodynamic interaction between impellers through increasing left impeller off-bottom height C 2 (as shown in Fig. S2 (C 2 /H = 0.3–0.7)), enhanced the instability of flow field and destroyed local circulation structure in the upper part of tank, resulting in more unstable flow field and higher mixing ...
In the recent years, the studies on power consumption for the turbine impeller-vessel systems of different geometry have been continued by many research workers. Using CFD, one can understand the mechanism of mixing of fluids in mixing tanks with much easier and economical means than the use of experiments.
Abstract. Read online. This paper presents simulation of rotating impeller in a mixing vessel by means of Computational Fluid Dynamics (CFD). A special emphasis is devoted to the study of influence of the choice of numerical model for simulation of rotation of impeller when mixing a Newtonian fluid in a vessel equipped with Rushton impeller, …
The conclusions from the simulator are that: • The extent of mixing for axial flow impellers for the simulator was better than that of radial flow impellers for this investigation. • The fluid dynamics of materials in the tanks were best described by PMSE and PMSR models.
The rigid-flexible impeller (RF impeller) was used in the mixing process of viscoplastic fluid, and the mixing performance of RF impeller was explored by using numerical simulation and experimental analysis. Results indicated that RF impeller could reduce the power consumption ( P ) and demonstrate the advantage of energy-saving compared …
The simulation results show that the impeller speed only affects the mixing process and does not change the mixing uniformity; the fill level has a significant effect on the particle mixing, and a higher fill level will inhibit the particle mixing; based on the uniform mixing, the fill level has little effect on the total power consumption per ...
Abstract. Stirred tank reactors are used routinely in chemical processing industries. Mixing and dispersion in such reactors depends on the geometry of the reactor and impeller. In addition, CFD simulations are an important tool for characterizing flow and turbulence. Towards this end, the flow field inside a stirred tank reactor is simulated ...
At the optimum mixing point of each impeller, the LLEs of the double impeller, double rigid combination impeller, and double rigid-flexible combination impeller were 0.018, 0.055, and 0.057 ...
Comparison of experimental and simulation-based mixing efficiencies. The experiment and simulation data showed that the relative standard deviation decreases with mixing time until stochastic homogeneity is reached. When comparing the impellers, the homogeneous state is reached more quickly by the 90°-impeller. ... Due to shorter …
The mixing tank with standard dimension has been designed using solid works as per the requirements and CFD is performed using Ansys by varying rpm and heat flux. The obtained graphs clearly show that on increasing the rpm of the impeller the mixing efficiency increases and the pressure distribution is even at 250 rpm.
