Effect of Closure Characteristics of Annular Jet Mixed Zone on Inspiratory Performance and Bubble System

Wang, Chao; Wang, Chuanzhen; Yu, Anghong; Zheng, Min; Khan, Mohidus Samad

doi:10.3390/pr9081392

Cited by 4 publications

(3 citation statements)

References 33 publications

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“…The standard k-epsilon turbulence model was used for numerical simulation and calculation, and the heat transfer process was not considered during the simulation. In the solution process, the SIMPLEC model was used for pressure-velocity coupling [26,27]. A second-order upwind scheme was used for the pressure gradient and momentum gradient, and a first-order upwind scheme was used for the turbulence kinetic energy and turbulent dissipation rate.…”

Section: System Settingsmentioning

confidence: 99%

Research on Performance Optimization of Liquid Concentration Detection Systems Based on Turbulence Elimination

Liu

Wang

et al. 2022

Processes

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Liquid concentration detection systems have been widely used in food, chemical, pharmaceutical, and many other industries. When the liquid flows, a large number of vortices will usually be generated, resulting in increased turbulence intensity, which will interfere with the detection of the concentration of the suspension. In this paper, a method for concentration detection by differential pressure based on turbulence elimination is proposed to improve the reliability of concentration detection results. The changes in the internal flow field corresponding to different lengths of the turbulence elimination structure and different inlet angles are analyzed through numerical simulation. Finally, the influence of changes in structure parameters on the accuracy of concentration detection is tested through experiments. The results show that when the length of the turbulence elimination structure is small, the vortex zone inside the concentration detection device changes with the inlet velocity. When the length of the turbulence elimination structure is 150 mm, the vortex zone is basically not affected by the inlet velocity. The stability of the flow field increases with the increase in the inlet angle. When the inlet angle increases to 60°, a stable zone of turbulence will form in the region where Y > 0.4 m. When the length of the turbulence elimination structure is 150 mm and the inlet angle is 60°, the expected experimental results are obtained, and the actual needs of liquid concentration measurement are met.

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Section: System Settingsmentioning

confidence: 99%

Research on Performance Optimization of Liquid Concentration Detection Systems Based on Turbulence Elimination

Liu

Wang

et al. 2022

Processes

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“…This process provides good initial conditions for subsequent flotation operations [1][2][3]. Jet flow field is widely used in the field of multiphase fluid mixing, which has a good dispersion and mixing effect on reagents and bubbles [4][5][6][7][8][9]. In a jet mixing flow field, the air is repeatedly sucked in and dispersed to form microbubbles, and the reagents adhere to the surface of the bubble liquid film, resulting in a strong coupling effect [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Study on Dispersion and Mixing Mechanism of Coal Slime Particles in Jet Mixing Flow Field

Zhou

Wang

et al. 2022

Minerals

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The jet flow field is characterized by the dispersion and mixing of multiphase flow, which is widely used in the field of coal slime flotation. In this paper, the behavior of coal slime surface modification, the behavior of material suspension and the effect of different jet fluids on coal slurry blending were studied. Based on the action mechanism of the jet flow field, a jet device suitable for coal slime graded mixing was proposed, and the mixing effect of the jet device was tested. The results show that the jet flow field has strong effects on material dissociation and dispersion, and the mixing effect of a single jet is equivalent to that of the laser particle size analyzer’s own agitation device after stirring for 2.5 min at 500 r/min speed. The SEM test of material surface morphology and the changes of Al and Si elements measured by EDS show that the jet flow field can effectively remove the fine mud wrapped on the surface of coal particles. The precondition of material suspension is to have the just-suspended capacity. The critical jet velocity of coal slime suspension is in the range of 6 m/s~9 m/s. The mixing ability of the jet stream has certain limitations. The increase or decrease of the jet height will cause the decrease of the suspension percentage of sampling points in the tank. The gas jet mode can promote the reagent acting on the surface of the bubble liquid film to form oil bubbles, which is more suitable for hydrophobic mineral flotation. The optimal speed of the gas jet is 0.86 m/s, and the shortest cycle period is 1.0 T (T is one material cycle period). The flotation perfection index of 0.5–0.25 mm and less than 0.075 mm coal slime increased by 2.67% and 26.78%, respectively, indicating that the overall idea of the jet mixing device proposed based on the experimental conclusion is feasible.

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“…Jin et al [20] combined numerical simulation and PIV test technology, and Processes 2022, 10, 593 2 of 13 finally concluded that in the process of gas-liquid mixed flow, the movement of fluid is driven by the momentum transfer from bubble to liquid. The study shows that the flow pattern of annular jet will affect the degree of sealing of the gas and water mixing zone in the nozzles, and the degree of closure will have a significant impact on the air suction performance and the formation of the foam system [21]. Therefore, studying the influence of the mechanism of gas content on the sealing degree of the gas-liquid mixing zone in submerged annular jets is of great significance for understanding the inspiratory behavior of the annular jet nozzle and ensuring the effective formation of the foam system.…”

Section: Introductionmentioning

confidence: 99%

Influence Mechanism of Gas–Containing Characteristics of Annulus Submerged Jets on Sealing Degree of Mixing Zone

2022

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The introduction of air into a submerged annular jet will result in dispersion of the jet, which will affect the degree of enclosure of the gas–water mixing zone in the annular jet nozzle, and then have a significant impact on air suction and the formation of the foam system in the floatation process. A numerical simulation method is used to analyze the characteristics of the distribution of the axial flow velocity of annular jets, gas–phase volume, and turbulence intensity in the gas–water mixing zone in the nozzle with different air–liquid ratios, and thereby reveal the mechanism whereby gas–containing in annular jets affects the degree of enclosure of the gas–water mixing zone. The results show that as the air–liquid ratio increases, the degree of air–liquid mixing will increase and the radial flow velocity will decrease gradually, resulting in the effective enclosure of the gas–water mixing zone. Meanwhile, the dissipation of jet energy, the range of turbulent flow and the vorticity intensity will increase, but the turbulence intensity will decrease. When the gas–water mixing zone is fully enclosed, as gas–containing continues to increase, the degree of dispersion of the annular jet will further increase. Consequently, the area of the gas–water mixing zone with bounced–back water will become larger, resulting in a higher axial flow velocity, larger local turbulence intensity and larger vorticity intensity. This will lead to the dissipation of jet energy, which is not favorable for air suction.

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Effect of Closure Characteristics of Annular Jet Mixed Zone on Inspiratory Performance and Bubble System

Cited by 4 publications

References 33 publications

Research on Performance Optimization of Liquid Concentration Detection Systems Based on Turbulence Elimination

Research on Performance Optimization of Liquid Concentration Detection Systems Based on Turbulence Elimination

Study on Dispersion and Mixing Mechanism of Coal Slime Particles in Jet Mixing Flow Field

Influence Mechanism of Gas–Containing Characteristics of Annulus Submerged Jets on Sealing Degree of Mixing Zone

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