Flow Characteristics of Oblique Submerged Impinging Jet at Various Impinging Heights

Zhang, Di; Wang, Hongliang; Liu, Jinhua; Wang, Chuan; Ge, Jie; Zhu, Yong; Chen, Xinxin; Hu, Bo

doi:10.3390/jmse10030399

Cited by 22 publications

(5 citation statements)

References 26 publications

(24 reference statements)

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“…With increasing target distance, the center impact pressure of the triangular and square nozzles is slowly attenuated and starts to become higher than that of the circular nozzle. This condition shows that nozzles with sharp edges can still maintain good clustering with a large target distance, improving the performance of the water jet, which is consistent with the research results of previous authors [29][30][31][32].…”

Section: Axial Variation Characteristics Of the Impact Pressure At Th...supporting

confidence: 92%

Effect of Special-Shaped Nozzle Structure on Water Jet Performance

et al. 2022

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The impact force and effective impact area of are water jet are two important indexes for evaluating jet performance, and the outlet shape of the nozzle has a great influence on jet performance. In this study, five nozzles with different outlet shapes were designed, and water jet test experiments were conducted at different inlet pressures using an independently built water jet impact test platform, and the influence law of nozzle shape on the center impact pressure and flow coefficient of the water jet was investigated. The influence of nozzle shape on the effective impact area and entrainment rate of water jet was further investigated by numerical simulation. The results showed that the center impact pressure of the circular nozzle was the greatest when the inlet pressure and the target distance were small. The center impact pressure, the flow coefficient, and the effective area of the triangular nozzle with sharp edges were better than the traditional circular nozzle when the inlet pressure and the target distance were increased. Although the center impact pressure of the square nozzle is lower than that of the circular nozzle, its flow coefficient and effective impact area are higher than those of the circular nozzle with increasing target distance. The water jets of the elliptical and cross nozzles were the most divergent, and the jet performance was poor.

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Section: Axial Variation Characteristics Of the Impact Pressure At Th...supporting

confidence: 92%

Effect of Special-Shaped Nozzle Structure on Water Jet Performance

et al. 2022

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“…Moreover, the intensity of the jet phenomenon at the impeller outlet is significantly greater than that at rated flow rate. This is due to the mismatch between the inlet angle of the impeller and the incoming flow angle of the medium under low flow conditions, which increases the intensity of the secondary flow in the impeller flow path, and thus, enhances the jet intensity at the impeller outlet position [35][36][37]. In particular, at 1.5 mm rotor-stator distance, the high-speed jet region produces two high-speed regional cores near each diffuser blade.…”

Section: Flowfield Pattern With Different Rotor-stator Distancesmentioning

confidence: 99%

Numerical and Experimental Study on the Effect of Rotor–Stator Distance on Rotor–Stator Interaction Strength within Mixed-Flow Centrifugal Pumps

Hong

Chen

Yang

et al. 2022

JMSE

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In this article, the influence of rotor–stator distance on the pump performance and rotor–stator interaction strength within mixed-flow centrifugal pump was investigated based on numerical calculation and test verification. Firstly, the performances of mixed-flow centrifugal pumps with two different rotor–stator distances were obtained and compared with the numerical results, which confirms the high accuracy of the numerical simulation. Next, the performances of mixed-flow centrifugal pumps with five different rotor–stator distances were compared and analyzed. It was found that the hydraulic performance of the mixed-flow centrifugal pump varies slightly as the rotor–stator distance increases. The mean values of the standard deviation of the head and efficiency of the mixed-flow centrifugal pump at each rotor–stator distance under full flow conditions are only 0.16 m and 0.11%, respectively. Then, the strengths of the rotor–stator interaction with different rotor–stator distances were analyzed. It was found that the strengths of the shock interaction, the wake interaction, and the potential interaction were all reduced with increasing rotor–stator distance. Moreover, when the rotor–stator distance is 1.5 mm, the pressure distribution in the circumferential direction of the rotor–stator interference zone shows obvious unstable characteristics: the pressure change amplitude is significantly greater than the other rotor–stator distance of the pressure change amplitude, the maximum and minimum pressure amplitude difference being 56.9 kPa, and with the increase in the rotor–stator distance, the maximum and minimum pressure amplitude difference gradually decreases, with an average value of 32.3 kPa. These findings could provide useful insight into prospects for the improvement of the operational stability of mixed-flow centrifugal pumps, and the results of this study can be extended to all centrifugal pumps using diffusers in the form of vanes as the pressure chamber, which has strong practical application and theoretical value.

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“…The process can not only reduce treating time and energy consumption but can also obtain better degradation effects. At present, scholars have performed many simulations on pumps − and jets, , but there are few studies on the degradation process of pollutants by molecular dynamics (MD) simulation. Existing studies are also based on the experimental point of view to explore the optimal conditions for the degradation rate of pollutants and the process combination method, and the effects of fluid properties, structure characteristics of HC equipment, and technology on HC effectiveness are studied in detail .…”

Section: Introductionmentioning

confidence: 99%

Effect of Bubble Collapse Combined with Oxidants on the Benzamide by Molecular Dynamics Simulation

Zhu

et al. 2022

Ind. Eng. Chem. Res.

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The combined use of hydrodynamic cavitation technology and H2O2 to treat organic wastewater can not only reduce the treatment time and energy consumption but can also achieve better degradation effects. Models containing different concentrations of H2O2 are established in this study to grasp the effect of H2O2 concentration on the bubble collapse process and benzamide degradation and the relationship among the mechanical, thermal, and chemical effects in the degradation stage. The transferable interatomic potential with the four-point model by the force balance method and the reactive force field are used to investigate the pressure field variation of bubble collapse and degradation efficiency. Results show that the total pressure released and the force on the upper and lower wall surfaces of the benzamide gradually increase with the rise in the H2O2 concentration when the bubble collapses, and the pressure difference between the upper and lower walls of benzamide decreases. The dynamic mean square displacement and diffusion coefficient of water molecules increase, and this condition is beneficial to the transport of hydroxyl ions (•OH). The benzamide molecule is subjected to mechanical force in the time period of 0–0.5 ps. The mechanical, thermal, and chemical effects work together on the molecular structure of benzamide in the time period of 0.5–4 ps. The effect of hydrodynamic cavitation technology combined with H2O2 on the degradation process of benzamide is explored by means of molecular dynamics simulation. This study deepens people’s understanding of cavitation theory and provides technical guidance and theory for the realization of harmless treatment of benzamide.

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Flow Characteristics of Oblique Submerged Impinging Jet at Various Impinging Heights

Cited by 22 publications

References 26 publications

Effect of Special-Shaped Nozzle Structure on Water Jet Performance

Effect of Special-Shaped Nozzle Structure on Water Jet Performance

Numerical and Experimental Study on the Effect of Rotor–Stator Distance on Rotor–Stator Interaction Strength within Mixed-Flow Centrifugal Pumps

Effect of Bubble Collapse Combined with Oxidants on the Benzamide by Molecular Dynamics Simulation

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