Liquid-liquid dispersion and flow characteristics in a miniaturized annular rotating device

Wang, Yubin; Tang, Tianyao; Yan, Zifei; Duan, Wuhua; Deng, Jian; Luo, Guangsheng

doi:10.1016/j.cej.2022.140374

Cited by 17 publications

(5 citation statements)

References 39 publications

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“…To quantify the effect of fluid flow and reaction on degradation efficiency in the microdevices, the dimensionless numbers (Reynolds number, Re; and Damkohler number, Da) are chosen. Re is the ratio of inertial and viscous forces . Da represents the relative time scale of chemical reactions compared to other phenomena in the same system.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Efficient Degradation of Oxytetracycline in a Novel Plug-In Three-Dimensional Photocatalytic Microreactor

Wang

Jin

Jia

et al. 2023

Ind. Eng. Chem. Res.

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The combination of a photocatalytic reaction and microfluidic technology is an increasingly popular method utilized to continuously degrade wastewater. In this work, a novel photocatalytic microreactor with TiO 2 loaded on the channel center insert was designed and the photocatalytic degradation process of oxytetracycline (OTC) was investigated. Parameters such as TiO 2 loading, OTC initial concentration, light intensity, and ion (NO 3 − and SO 4 2−) concentrations were systematically investigated. The results show that the degradation efficiency of OTC was 56% under the optimal experimental conditions. Compared with the conventional miniaturized photocatalytic reactors, the reaction rate constant and space−time degradation efficiency of the plug-in three-dimensional photocatalytic microreactor proposed in this work were 1−2 orders of magnitude higher. In addition, dimensionless correlation was obtained to predict the degradation efficiency. This work provides a promising microfluidic technology for the process intensification of photocatalytic reaction and wastewater treatment.

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Section: Methodsmentioning

confidence: 99%

“…Re is the ratio of inertial and viscous forces. 26 Da represents the relative time scale of chemical reactions compared to other phenomena in the same system. Re and Da are defined as follows:…”

Section: Photocatalytic Degradation Experimentsmentioning

confidence: 99%

Efficient Degradation of Oxytetracycline in a Novel Plug-In Three-Dimensional Photocatalytic Microreactor

Wang

Jin

Jia

et al. 2023

Ind. Eng. Chem. Res.

Self Cite

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“…According to Equation (1), the crystal's terminal velocity [15] when suspended is approximately 1.61 m/s. According to Equation (3), the flow [16] rate required to suspend the crystal is approximately 1.64 L/s.…”

Section: Design Solutionsmentioning

confidence: 99%

Research on Single Crystal Preparation via Dynamic Liquid Phase Method

Wang

Zhou

2023

Crystals

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Traditional liquid phase methods for growing single crystals are static growth methods, which include seed crystal sedimentation growth and seed crystal clamping growth using seed crystal holders. Single crystals grown via seed crystal sedimentation often have a flat and elongated shape, and the region in contact with the bottom of the container is restricted during growth, resulting in significant defects. Similarly, the seed crystal clamping growth method cannot avoid contact with external objects, leading to abnormal growth at the contact points and along the direction of the seed crystal holder, also resulting in certain defects. Both of these growth methods require processes, such as cutting and grinding, to remove defects, resulting in resource waste. To address the shortcomings of the static liquid phase single-crystal preparation mentioned above, this study successfully designed a dynamic liquid phase method for single crystal growth, which achieved the successful suspension of seed crystals in the mother solution and the growth of high-quality, large-sized single crystals, avoiding contact with the walls and the bottom of the container during the crystal growth process. Based on the dynamic liquid phase single crystal growth apparatus mentioned above, stable and dynamic liquid phase preparation was successfully achieved, ranging from seed crystals with a diameter of approximately 5 mm to single crystals with a diameter of approximately 20 mm, by controlling the cooling rate and adjusting the solution flow rate.

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“…In the past few decades, microfluidic technology has been rapidly developed into a prevailing method for generating droplets with controllable size and excellent monodispersity, − which are widely used in numerous fields such as microreactions, , material synthesis, drug delivery, and so on. − Compared to common microfluidic devices with T-junction, − coflow, − and flow-focusing configurations in which the regulation of the droplets’ generation mainly depends on the shearing force induced by another immiscible continuous phase, − droplet formation in step emulsification is instead caused by the Rayleigh–Plateau instability of the liquid thread triggered by an abrupt change in flow confinement . Owing to the special breakup mechanisms, the size of droplets formed in step emulsification is therefore dominated by the geometric features of the device and the fluid wettability but is insensitive to the flow rates of both phases, which obviously contributes to the construction of parallelized microfluidic networks for the mass production of monodisperse droplets. , To rationally design the parallelized microfluidic networks, it is essential to reveal the droplet formation mechanisms in step emulsification and further establish the relevant regulation models of flow pattern and droplet size.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spontaneous Formation Mechanisms of Droplets in Step Emulsification

Zhang

Tao

et al. 2023

Ind. Eng. Chem. Res.

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Droplet step emulsification has been proven to possess the unique advantage of decoupling the flow parameters, which obviously contributes to the realization of the mass production of monodisperse droplets. However, a complete understanding of the dynamic characteristics underlying droplet spontaneous formation in step emulsification has not been fully revealed and remains a challenge because the channel confinement effect always results in the complexity in interface spatiotemporal evolution under various conditions. In this work, the spontaneous formation mechanisms of droplets in step emulsification are numerically investigated via a VOF–CSF model. The physics behind the two distinct flow patterns regarding dripping and jetting are deeply revealed based on the local flow field structures and pressure distribution, and it was found that in dripping, before final pinch-off of the neck, a finite time singularity usually exists, thus leading to infinite velocity and pressure inside the neck. However, in jetting, as the droplet steadily expands, the velocity and pressure inside the neck finally reach an equilibrium state. Besides, by taking multiple variables with a wide range into account, the flow pattern diagram and the prediction correlation of droplet size are established with several dimensionless numbers, exhibiting excellent universality. In particular, the force field characteristics previously undocumented for droplet step emulsification are also quantitatively clarified from a new perspective of momentum conservation. The results obtained in this study reveal the spontaneous formation mechanisms of droplets in step emulsification, thus providing theoretical guidance for precisely regulating the emulsification process.

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Liquid-liquid dispersion and flow characteristics in a miniaturized annular rotating device

Cited by 17 publications

References 39 publications

Efficient Degradation of Oxytetracycline in a Novel Plug-In Three-Dimensional Photocatalytic Microreactor

Efficient Degradation of Oxytetracycline in a Novel Plug-In Three-Dimensional Photocatalytic Microreactor

Research on Single Crystal Preparation via Dynamic Liquid Phase Method

Spontaneous Formation Mechanisms of Droplets in Step Emulsification

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