Static Mixer Research Articles

Micromixing performance of a static mixer with an internal triply periodic minimal surface structure

Micromixing performance of a static mixer with an internal triply periodic minimal surface structure

Evaluation of the Performance of Static Mixers in 3D Printed Millireactors Using Integrated pH-Sensitive Films

The aim of this research was to prepare pH sensor films based on litmus using the sol–gel method with tetraethoxysilane (TEOS) and phenyltrimethoxysilane (PTMS) as precursors. The pH sensor film was then applied to millireactors to evaluate its performance on the intricate geometries of static mixers commonly found in millireactor designs. Millireactors were made from Formlabs High Temp resin using stereolithography (SLA) and from Anycubic Basic resin using digital light processing (DLP) technology. The performance of the pH sensor films was evaluated by tracking color changes in the pH sensor films and analyzing RGB (red, green, blue) and hue values through a smartphone application. The experiment involved mixing solutions with different pH values at varying flow rates within the millireactor channels. Furthermore, along with analyzing the hue values, characterization techniques involved measuring contact angles with water and diiodomethane. A film combining a litmus indicator with titanium dioxide (TiO2) displayed a color change within one minute and maintained this color throughout the study, confirming its reusability. Sensor films exhibited excellent reversibility (RSD = 2.4–3.3%) and stability. The findings demonstrate that the pH-sensitive films perform robustly across varying geometries, paving the way for their integration into advanced millireactor systems with static mixers and continuous chemical monitoring within Industry 4.0.

Numerical simulation of a static cyclone mixer for weighted drilling fluids

Abstract In the drilling process of oil and gas extraction, safety accidents such as well blowouts and well surges are prone. The drilling team needs a large amount of spare weighted drilling fluid to realize rapid well pressure and ensure the safety of the drilling process. To reduce the energy consumption of mixing work and improve the mixing efficiency of aggravated drilling fluids, a new static cyclone mixer is proposed in this paper. In this paper, a numerical simulation of the static cyclone mixer is carried out by using the computational fluid dynamics (CFD) method to simulate the effects of the diameter of the cyclone mixer and the number of blades on the mixing effect, respectively. The diameter and the number of blades of the static cyclone mixer have a great impact on the mixing effect. The results show that when the diameter and the number of blades are increased or decreased beyond a certain value, the mixing effect is not further enhanced.

Dispersion of immiscible liquids in a static mixer without inserted elements: A CFD-PBM study on droplet size reduction and distribution

Dispersion of immiscible liquids in a static mixer without inserted elements: A CFD-PBM study on droplet size reduction and distribution

Numerical analysis of blade height ratio effects on mixing efficiency and energy consumption in triple-blade concentric double-helix static mixers

This work aims to find the optimum value of blade height ratio (R) for improving mixing performance and energy consumption of a Triple-Blade Concentric Double-Helix Static Mixer. In this study, mixing of two fluids at different concentrations subjected to laminar flow conditions is numerically analyzed by using finite element-based Computational Fluid Dynamics simulations. Different values of the R parameter are considered in a wide range of Reynolds numbers (Re = 200–1000). This analysis then carried out an in-depth study of R's effect on mixing performance, strength segregation, mixing index, helicity, velocity profile, pressure drop, pumping power, and efficiency. The findings showed that a blade height ratio of R = 2/3 gave the highest mixing index (MI), with the maximum value of 0.99 at a Re number of 600, which showed the best mixing performance in the channel. Helicity visualization also showed complex helicity patterns with increased vortex interactions for the 2/3 configuration. This geometry gave an improvement in MI by about 17.85% over Triple-Blade Concentric Single-Helix Static Mixer (TB-CSH-SM) with R = 0 at Re = 600. It is also important to mention that increasing the R value leads to an increase in pressure drop and, consequently, an increase in pumping energy consumption. Although R = 2/3 gives the best mixing performance, the energy consumption is relatively higher than that for R = 0, which has the lowest power input but a lower MI. The investigation concludes that R = 2/3 represents a balanced solution since it realizes an optimum mixing performance with a moderate energy consumption and hence is suitable for applications requiring an efficient compromise between mixing quality and energy consumption.

Chaotic mixing performance of non-Newtonian fluids in S-Type static mixer and optimization based on response surface methodology

Chaotic mixing performance of non-Newtonian fluids in S-Type static mixer and optimization based on response surface methodology

Numerical Simulation of Static Ammonia Mixer in Denox Unit of Flue Gas Purification Plant

The modeling of a mixer used for mixing ammonia and flue gasses is considered. Simulations were performed using Flow Vision 3.14 (TESIS LLC). As a result of the simulation, the distribution of concentrations along the mixer length was obtained at 50%, 65%, 85%, and full flue gas loading. It was found that operations at 100% and 85% gas loads are accompanied by an acceptable distribution of ammonia in the mixer volume (Cov = 0.05). The development and creation of an experimental model in real production was carried out according to the results of the numerical simulation. The simulation results were compared with experimental data on the speed and concentration of ammonia in the control section. The discrepancy, in general, did not exceed 15%. The developed mixer corresponds to modern developments in terms of mixing quality but is simpler in design and more compact.

Study on influence factors of mixing uniformity for dredged spoil utilized as a resource by PFM with static mixer

Study on influence factors of mixing uniformity for dredged spoil utilized as a resource by PFM with static mixer

Preliminary Evaluation of Bio-Inspired Quasi-Static Mixers for In-Line Injection Systems

HighlightsA bio-inspired quasi-static mixer mimic gastrointestinal peristalsis was designed.Image-based methods for assessing uniformity were performed.Consistently low variations confirmed the mixer's performance in mixture uniformity.Offers insights for enhancing mixer performance with bio-inspired approaches.Abstract. In precision agriculture, the in-line pesticide mixing system enhances conventional premixing methods by integrating a key component: the in-line mixer. This study introduces a novel bio-inspired quasi-static mixer designed to mimic gastrointestinal peristalsis, aimed at improving functionality. Utilizing the pixel-based coefficient of variation (CV) and histogram information entropy (HIE) for assessment, this research evaluates the performance of in-line mixers. Results demonstrate that the bio-inspired mixer consistently achieves CV values below 3.84%, obviously enhancing mixture uniformity. Specifically, it improves uniformity by an average of 34.09% for CV and 14.67% for HIE compared to conventional static mixers. These metrics effectively measure the uniformity levels of pesticide mixtures, indicating the superior performance of the bio-inspired mixer in achieving homogeneous mixtures under varied operational conditions. Furthermore, the study confirms the mixer's adaptability, showing notable performance improvements with increased flow rates and mixing ratios. This research validates the potential of bio-inspired design in enhancing the efficiency and efficacy of mixing systems and provides valuable insights for future mixer optimization to meet diverse agricultural needs. Keywords: Image processing, In-line detection, Mixture uniformity, Pesticide, Static mixer.

Optimization of continuous-flow microwave processing with static mixers for enhanced heating uniformity

Optimization of continuous-flow microwave processing with static mixers for enhanced heating uniformity

СТАТИЧЕСКИЙ СМЕСИТЕЛЬ ДЛЯ КОНТРОЛЯ ПРОЦЕССА ЗЕРНОСУШЕНИЯ

The purpose of the study is to improve the technology of mixing grain samples using a patented manufactured static mixer. Tasks: to study the technology of grain mixing in a multi-stage static mixer; determine the uniformity and homogeneity of mixing. Materials are given based on the results of a study of the formation of average samples from a batch of grain that have undergone moisture removal on grain drying equipment to a moisture content of 14 %. Experimental studies on the formation of an average sample were carried out using new technological equipment, copyrights are protected by a utility model patent of the Russian Federation No. 202890 "Static laboratory mixer". The average sample was formed from 15 point samples taken from different places of the grain batch. Mixing grain from individual point samples was carried out by pouring grain into the mixer receiving hopper, from which, under the action of gravity, it then begins to move from top to bottom along the conical system of mixing elements placed in a cylindrical housing, on the central axis of which cone mixing elements are installed in series, each of which is made in the form of closed hemispheres mounted on stands mounted on cone tides, in which passage holes are made, to ensure the continuous movement of mixed seeds of grain crops. As a result of mixing on the developed mixer, 4 samples of medium samples were obtained, the content of which showed that the composition of the mixed samples contains the required amount of grains from point samples with a deviation: in 1 sample +1.2 %; in the second sample – 1.2; in the third sample – 0.6 and in the fourth sample +0.6 %, which corresponds to the standards of ±5 %.

ANALYSIS OF THEORETICAL STUDIES OF DEVICES FOR DOSING AND MIXING NUTRIENT SOLUTIONS

Fertigation systems play an important role in greenhouse crop production, which allow combining irrigation and fertilization processes, providing optimal plant nutrition. The main task of such systems is accurate dosing and uniform mixing of nutrient solutions, including different types of fertilizers, with water. Fertigation technology makes it possible to significantly reduce the loss of water and fertilizers, as well as to increase the efficiency of their use at various stages of plant growth. However, the effectiveness of these systems depends on the quality of the mixing and dosing devices, which must ensure the uniform distribution of nutrients in the solution. Today, there are different designs of mixers for the preparation of nutrient solutions: mechanical mixers with moving elements and static mixers that use hydraulic flows for mixing. Mechanical mixers are suitable for solid and hard-to-dissolve fertilizers, but their operation is complicated by the presence of moving parts. Static mixers are easier to use and have no moving parts, making them efficient and reliable for fertigation systems. The analysis of theoretical studies of devices for dosing and mixing nutrient solutions, in particular, jet mixers that work according to the static principle, has been carried out. The considered devices for preparing liquid mixtures are of the ejector type, on the basis of which many modern systems are built. The main attention is paid to the calculations of the optimal geometrical parameters of jet dispensers-mixers. The theoretical studies of most scientists are focused on determining the injection coefficient — as a key parameter that determines the efficiency of mixing and dosing. Theoretical approaches also include models of turbulent particle transport and semi-empirical equations to evaluate mixing quality. However, the issue of practical assessment of the quality of multi-component mixer-dispenser mixtures remains insufficiently studied.

Experimental Study on Biodiesel Production in a Continuous Tubular Reactor with a Static Mixer

Experimental Study on Biodiesel Production in a Continuous Tubular Reactor with a Static Mixer

Investigation into Droplet Size Distribution and Turbulent Mixing Enhancement Performance in a Lightnin Static Mixer

Investigation into Droplet Size Distribution and Turbulent Mixing Enhancement Performance in a Lightnin Static Mixer

Study on mixing performance of perforation static mixers applied to high viscosity polymer mixing

AbstractTo investigate the effect of perforation structure on the mixing performance, three kinds of perforation arrangement were used to modify Kenics static mixer, which were radial arrangement, axial arrangement, and diagonal arrangement. The corresponding modified static mixers were constructed and named PSM‐R, PSM‐A, and PSM‐D. The flow of polymer melts inside them were simulated using Polyflow software. The effects of perforation arrangement, perforation diameter (d), and perforation spacing distance (δ) on segregation scale (S) and pressure drop (Δp) were analyzed using single‐factor experiment. The results showed that the perforation structure was helpful to improve the mixing effect. The impact of d on S and Δp was more significant. While increasing d of PSMs, S firstly decreased and then increased. However, Δp monotonously decreased. The impact of δ on S and Δp was smaller. The model of Reynolds number (Re) versus Δp was obtained by fitting and the effect of Re on Δp was significant. In all PSMs, PSM‐A with d of 3 mm and δ of 7 mm has the smallest S, that was reduced by 26.2%, compared to the standard Kenics static mixer.

Effect of incorporating Sulzer SMV static mixers on the performance of direct contact membrane distillation (DCMD): A three-dimensional computational fluid dynamics (CFD) study

Effect of incorporating Sulzer SMV static mixers on the performance of direct contact membrane distillation (DCMD): A three-dimensional computational fluid dynamics (CFD) study

Enhancing turbulent hydrothermal pretreatment of non-Newtonian microalgae slurry utilizing static mixers with secondary flow generators

Enhancing turbulent hydrothermal pretreatment of non-Newtonian microalgae slurry utilizing static mixers with secondary flow generators

Effect of Elements Connection Types on Mixing Performance of Kenics Static Mixer

In this work, we analyzed the influence of four connection types of Kenics static mixer, namely direct connection static mixer (DSM), transition blade static mixer (TSM), plug-in static mixer (PSM) and solder joints static mixer (SSM) on the mixing performance. The effects of transition blade diameter, groove depth and solder joint diameter on segregation scale (S) and pressure drop (Δp) were studied. The results indicated that a better mixing performance and Δp were found in the mixers of DSM and three other small-sized connection types. The smallest Δp of 1.29 MPa were found in DSM, TSM3 and SSM2. The smallest S of 0.101 mm were found in PSM0.5. In addition, Δp and S increased as the connection size increases, in TSM, PSM and SSM. The agglomeration of particles was obvious in TSM and PSM with large connection sizes, but not in SSM.

Circulation process of methyl ester production from pretreated sludge palm oil using CaO/ABS catalytic static mixer coupled with an ultrasonic clamp

Circulation process of methyl ester production from pretreated sludge palm oil using CaO/ABS catalytic static mixer coupled with an ultrasonic clamp

Characterization of the oil water two phase flow in a novel microchannel contactor equipped with helical wire static mixer

This study investigates an oil/water two-phase system to assess the potential efficacy of a novel passive mixer in enhancing the liquid-liquid interfacial area within a micro-channel contactor. In this system, two fluids are introduced into a microchannel with a diameter of 800 μm and a length of 20 cm, which is equipped with a stainless-steel helical wire measuring 250 μm in diameter. Throughout the experiments, both fluids are supplied at equal flow rates, and the dominant forces, including attachment and detachment forces, are examined. The results reveal a critical Weber number of 3.8 × 10−³, at which the first detachment occurs. A comparison between microchannels with and without the passive micromixer demonstrates that greater slug breakup occurs in the system incorporating the helical wire micromixer. This innovative configuration results in a significant reduction in slug/droplet size compared to a microchannel without a barrier, decreasing from approximately 600 μm to 390 μm at a flow rate of 0.8 mL/min. Additionally, a flow map is presented, illustrating three distinct flow regimes: flow contains long slug, Slug-droplet flow, and droplet flow regimes, with the droplet flow regime covering the largest area. The findings indicate that the implementation of this innovative passive mixer substantially increases the interfacial area, providing significant advantages for mass transfer applications.