On the breakup of Taylor length scale size bubbles and droplets in turbulent dispersions

Chen, Yongjie; Ding, Jun; Weng, Peifen; Yang, Xiaoquan; Wu, Wenjun

doi:10.1016/j.cej.2019.05.187

Cited by 13 publications

(4 citation statements)

References 37 publications

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“…The breakup probability P is defined as the ratio between the number of broken drops and the total number of injected drops under the same experimental conditions [14,[36][37][38]. The droplet deformation and breakup are governed by the capillary number [39][40][41][42][43].…”

Section: Breakup Probabilitymentioning

confidence: 99%

Experimental Investigation on Single‐Droplet Deformation and Breakup in a Concave‐Wall Jet

Zhang

Gao

et al. 2020

Chem Eng & Technol

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Liquid droplets are released in the concave‐wall jet to investigate their deformation and breakup characteristics. CCl4 and water are the dispersed and continuous phases. The study reveals that the three modes of single droplets in the concave‐wall jet are non‐breakup, binary breakup, and multiple breakup. When the Weber (We) number is less than 30, the mode of binary‐breakup is primary for the droplets, however, there are only multiple‐breakup modes when We > 47. The non‐breakup and binary‐breakup modes are beneficial to the gravity and centrifugal separation because of little deformation and high axial velocity of the droplet. Effects of continuous‐phase tangential velocity and shear rate distribution on the droplet image sequence are studied. Droplet breakup occurs mainly in the region of high shear rate.

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Section: Breakup Probabilitymentioning

confidence: 99%

Experimental Investigation on Single‐Droplet Deformation and Breakup in a Concave‐Wall Jet

Zhang

Gao

et al. 2020

Chem Eng & Technol

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“…The drop breakup in the turbulent flow was mainly caused by the turbulent pressure fluctuation mechanism when the Ohnesorge number was less than 0.01. Chen et al proposed that the drop breakup criteria depended on the degree of surface deformation prior to the breakup, and the relationship between turbulent eddies and drop breakup was established and quantified [9]. Han et al proposed a theoretical model based on the theories of isotropic turbulence, which stated that drop breakup was based on an interfacial energy density increase [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Curvature Radius on Single-Droplet Dynamic Characteristics within a Concave-Wall Jet

Gong,

Jian,

Zhang

et al. 2024

Processes

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The centrifugal force field in a hydrocyclone was affected by the concave-wall curvature radius R0, and the mechanism underlying droplet deformation was closely related to the mass transfer efficiency. Numerical simulation and experimental data were collected to reveal the deformation characteristics and mechanism of a single droplet crossing concave-wall jet. Normalized interfacial energy γ and stretching performance were provided to investigate the droplet deformation process. The results showed that the droplet was stretched along the streamwise direction and shrank along the spanwise direction in the concave-wall jet. The droplet interfacial energy and deformation were the largest when the droplet crossed the jet boundary at t = 0.20 s. The maximum γ value increased with the increase in R0 by 57.3% to 71.4%, and the distance between the droplet and concave wall increased with R0. The Q-criterion was exported to show the increase in the vortex strength with the decrease in R0 at the jet boundary. The pressure distribution inside the droplet showed that the pressure decreased as R0 increased, while the pressure difference increased along the streamwise and wall-normal directions. This study suggested that the droplet breakup was more difficult for a smaller R0, which was beneficial for liquid–liquid heterogeneous separation.

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“…The drop breakup in the turbulent flow was mainly caused by the turbulent pressure fluctuation mechanism when the Ohnesorge number was less than 0.01. Chen et al proposed that the drop breakup criteria depended on the degree of surface deformation prior to breakup, and the relationship between turbulent eddies and drop breakup was established and quantified [9]. Han et al proposed a theoretical model based on the theories of isotropic turbulence that the drop breakup was based on interfacial energy density increase [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Curvature Radius on Single Droplet Dynamic Characteristic within Concave-Wall Jet

Gong,

Jian,

Zhang

et al. 2023

Preprint

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The centrifugal force field in the hydrocyclone was affected by the concave-wall curvature radius R0, the mechanism of droplet deformation was closely related to the mass transfer efficiency. Numerical simulation and experimental data were collected to reveal the deformation characteristics and mechanism of single droplet crossing concave-wall jet. Normalized interfacial energy γ and stretching performance were provided to investigate the droplet deformation process. The results showed that the droplet was stretched along the streamwise and shrank along the spanwise in the concave-wall jet. The droplet interfacial energy and deformation were the largest when the droplet crossed the jet boundary at t = 0.20 s. Maximum γ value increased with the increase of R0 by 57.3% to 71.4%, and the distance between droplet and concave-wall increased with R0. Q-criterion was exported to show the vortex strength increasing as the decrease of R0 in the jet boundary. The pressure distribution inside the droplet showed that the pressure decreased as R0 increased, while the pressure difference increased along the streamwise and wall-normal direction. The study suggested that the droplet breakup was more difficult for the smaller R0, which was beneficial for liquid-liquid heterogeneous separation.

show abstract

On the breakup of Taylor length scale size bubbles and droplets in turbulent dispersions

Cited by 13 publications

References 37 publications

Experimental Investigation on Single‐Droplet Deformation and Breakup in a Concave‐Wall Jet

Experimental Investigation on Single‐Droplet Deformation and Breakup in a Concave‐Wall Jet

Effect of the Curvature Radius on Single-Droplet Dynamic Characteristics within a Concave-Wall Jet

Effect of Curvature Radius on Single Droplet Dynamic Characteristic within Concave-Wall Jet

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