Intensification of Droplet Dispersion by Using Multilayer Wire Mesh and Its Application in a Rotating Packed Bed

Su, Meng-Jun; Le, Yuan; Chu, Guang‐Wen; Li, Yanbin; Zhang, Liang‐Liang; Luo, Yong

doi:10.1021/acs.iecr.9b07033

Cited by 13 publications

(7 citation statements)

References 32 publications

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“…Using a porous material to disperse a liquid can generate more daughter droplets without additional energy input, bringing the advantage of the increased liquid surface area. , Porous stainless steel wire meshes have been widely used in filtration, separation, spray, and other chemical processes . Li et al studied the filtration performance of a sintered stainless steel wire mesh filter with a nominal filtration degree of 0.5 μm, which is used to purify CO 2 solid particles from liquid nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Numerical Studies of a Liquid Droplet Impacting on Single-Layer Hydrophilic and Hydrophobic Wire Meshes

Liao

Ouyang

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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To understand the mechanism of droplet dispersion, the behaviors of a droplet impacting on a single-layer wire mesh were investigated by computational fluid dynamics simulations with a detailed 3D geometry of real woven wire meshes. After validating the simulation data, the effects of different operating conditions on the liquid dispersion were systematically studied. The results showed that the cone angle of dispersion of the hydrophobic wire mesh increased by 37–103%, compared with the hydrophilic wire mesh. A more accurate dispersion angle can be obtained by the 3D simulation, compared to the previous high-speed imaging experiments with 2D photographs. The ratio of dissipated energy of the droplet impacting on the hydrophobic wire mesh was 29% lower than that on the hydrophilic wire mesh, allowing us to reveal the dispersion intensification mechanism of droplet breakage. This study provides insights into the droplet impaction and dispersion on the wire mesh packing, which can guide reactor design and optimization.

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Section: Introductionmentioning

confidence: 99%

Numerical Studies of a Liquid Droplet Impacting on Single-Layer Hydrophilic and Hydrophobic Wire Meshes

Liao

Ouyang

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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“…The Weber number is a dimensionless number which describes the ratio between a kinetic energy and a surface energy of the drop. The impact of relatively large droplets on a fine mesh was described for other differing input parameters, such as several layers of wire meshes in Su et al [11] or hydrophobic mesh in Zhang et al [12]. A hydrophobic mesh shows a dispersion angle under the mesh that is significantly greater than that of a hydrophilic mesh.…”

Section: Introductionmentioning

confidence: 99%

A dispersion of a droplet flow on crossing wires in an air counterflow

Hájek,

Cejpek,

Malý

et al. 2022

EPJ Web Conf.

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Liquid dispersion on a wire mesh is a phenomenon that is utilized in many industrial applications, such as rotating packed beds. It is a very simple method of liquid atomization without a need for complex nozzles. This research focuses on an elementary case of a liquid dispersion on a crossing of two wires. Experiments were carried out in a wind tunnel to elucidate the influence of counterflow air velocity on a liquid sheet and droplets. High-speed camera was used to capture the impact of droplets on the crossing. Images were then processed using MATLAB® addon PIVlab. The effect of the input parameters, including a liquid flow rate in the range of 3.8 to 12 kg/h and air flow velocity varying from 0 to 9 m/s on the angle and velocity of dispersed droplets downstream of the crossing, was investigated. Finally, a qualitative description of the dispersion was evaluated. Results show that with an increasing liquid flow rate, the droplets dispersed in a wider angle. On the other hand, the influence of the air counterflow is significant only for low liquid flow rates. The atomization rate, determined by the number of small droplets, was better for higher liquid flow rates.

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“…In the RPB, the liquid was injected to the packing, then sheared into tiny liquid elements of droplets, films, and so forth. , In our previous work, the hydrophobicity of the wire mesh has been proven to generate a better initial liquid distribution at the inner packing zone of a RPB, which could enhance the mass transfer and micromixing process . Besides optimizing the macrostructure and types of packing, recent advancements in the surface modification at micro-scale of the wire mesh packing for liquid dispersion enhancement provide a promising direction for further improvement of the reactor performance. − …”

Section: Introductionmentioning

confidence: 99%

“…Lu et al installed a single-layer hydrophobic SSM in the inner cavity zone of the RPB to obtain a better initial liquid dispersion for the rotor. Multilayer hydrophobic SSMs were also applied in the RPB for mass transfer intensification . Besides the RPB, the solid surface modification was also applied in other chemical equipments.…”

Section: Introductionmentioning

confidence: 99%

“…Multilayer hydrophobic SSMs were also applied in the RPB for mass transfer intensification. 19 Besides the RPB, the solid surface modification was also applied in other chemical equipments. For example, foam SiC 20 and tray 21 with different wettabilities by the surface modification method were developed and the hydrodynamics were systematically studied in the column.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of Liquid Dispersion Enhancement by the Hydrophobic Wire Mesh at Macro- and Micro-Scale

Zhang

Liao

et al. 2021

Ind. Eng. Chem. Res.

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The hydrophobic surface-modified stainless steel wire mesh (SSM) has been proven to enhance the liquid dispersion effectively, which has a significant impact on the mass transfer and micromixing performance. Therefore, the mechanism of liquid dispersion enhancement by SSM is significantly valuable. However, the mechanism of liquid dispersion enhancement by SSM has not been revealed up to now. In this work, hydrodynamics of the liquid flow pattern and liquid velocity field of liquid jet impacting on SSM were observed and analyzed, aiming to elucidate the intensification mechanism at macro-and micro-scale. The cone angle of SSM could be reached ∼80°with a daughter droplet diameter of ∼1.7 mm. The cone angle was enlarged by 60%, and the daughter droplet diameter was 20% smaller from SSM with smaller fiber and opening. Results of liquid velocity field showed that the better liquid dispersion by SSM mainly resulted from the larger horizontal velocity, which was up to −0.5 to 0.7 m/s by SSM compared with −0.1 to 0.1 m/s by NSM. A mechanism of liquid dispersion enhancement by SSM was suggested and validated as follows: the wettability of wire mesh affected the flow pattern by various velocity fields to form different cone angles at macro-scale; the micro− nano structure on SSM retained the liquid with the Cassie model, which led to smaller dissipation energy. More energy was transformed to the surface and kinetic energy of daughter droplets with a smaller diameter. This work provided an insight into liquid dispersion enhancement by surface modification, which can guide the rational liquid dispersion design.

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Intensification of Droplet Dispersion by Using Multilayer Wire Mesh and Its Application in a Rotating Packed Bed

Cited by 13 publications

References 32 publications

Numerical Studies of a Liquid Droplet Impacting on Single-Layer Hydrophilic and Hydrophobic Wire Meshes

Numerical Studies of a Liquid Droplet Impacting on Single-Layer Hydrophilic and Hydrophobic Wire Meshes

A dispersion of a droplet flow on crossing wires in an air counterflow

Mechanism of Liquid Dispersion Enhancement by the Hydrophobic Wire Mesh at Macro- and Micro-Scale

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