Study on flow field characteristics in a reverse rotation cyclone with PIV

He, Mengya; Zhang, Yanhong; Ma, Liang; Wang, Huanglin; Fu, Pengbo; Zhao, Zhihuang

doi:10.1016/j.cep.2018.02.026

Cited by 26 publications

(7 citation statements)

References 25 publications

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“…26 The two-phase model with the same density was mainly used in the numerical simulation in order to compare with the data of particle image velocimetry. 27 The DPM with density difference was limited to study the plane-wall jet 28 ; this study only analyzed the interaction between the dispersed particles of a vertical downward turbulent wall jet and the fluid turbulence in a uniform flow. The research showed that the DPM had the irreplaceable position for explaining the jet flow F I G U R E 1 (a) Cross-sectional flow pattern of turbulent concave-wall jet, adopted from Kobayashi and Fujisawa (1982).…”

Section: Introductionmentioning

confidence: 99%

“…Particle image velocimetry flow experiment was the main measured method in the multiphase jet; the discrete particle density was close to the continuous phase medium for obtaining the characteristic of jet flow 26 . The two‐phase model with the same density was mainly used in the numerical simulation in order to compare with the data of particle image velocimetry 27 . The DPM with density difference was limited to study the plane‐wall jet 28 ; this study only analyzed the interaction between the dispersed particles of a vertical downward turbulent wall jet and the fluid turbulence in a uniform flow.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation and instability analysis of particles in liquid–solid concave‐wall jet using DPM‐RSM

Zhang

et al. 2022

Asia-Pacific J Chem Eng

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The liquid–solid concave‐wall jet existed in the vertical cylinder separator with tangential inlet; the instability near concave‐wall was the key factor for centrifugal separation. The effects of jet flowrate and wall curvature radius on the instability of solid‐particles were explored by experiment and numerical simulation. The results showed that the separation efficiency of particles decreased with the increase of centrifugal separation factor. The liquid–solid concave‐wall jet flow in separator was unstable in this study. The decay rate of jet maximum velocity on the concave‐wall was larger than that on plane‐wall jet. The ratio of half‐width value to wall curvature radius was about 0.08 at the circumferential direction 90°, which coincided with the critical value of centrifugal instability in strongly concave‐wall jet. The pressure, velocity, and vorticity fluctuated periodically along streamwise direction in separator. The fluctuation period was linearly related to the wall curvature, and the radial range of fluctuation was only half of jet width. The paired longitudinal vortices formed along the flow direction, and the longitudinal vortices merged at length 0.74 m from the inlet cross‐section along circumferential direction. After the position of vortices merged, the particle trajectory oscillated obviously.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical simulation and instability analysis of particles in liquid–solid concave‐wall jet using DPM‐RSM

Zhang

et al. 2022

Asia-Pacific J Chem Eng

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“…Harris and Smith [41] tried to use olive oil to seed particles for optical flow measurement. He et al [42] used particle image velocimetry to measure air movement in a reverse rotation cyclone. Sugar aerosol is used to represent flow movements due to its adequate scattering property and high resolution.…”

Section: Introductionmentioning

confidence: 99%

A Method to Generate Experimental Aerosol with Similar Particle Size Distribution to Atmospheric Aerosol

Ren

et al. 2021

Atmosphere

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The SARS-CoV virus spreads in the atmosphere mainly in the form of aerosols. Particle air filters are widely used in indoor heating, ventilation, and air-conditioning (HVAC) systems and filtration equipment to reduce aerosol concentration and improve indoor air quality. Requirements arise to rate filters according to their mass-based filtration efficiency. The size distribution of test aerosol greatly affects the measurement results of mass-based filtration efficiency and dust loading of filters, as well as the calibration of optical instruments for fine-particle (PM2.5) mass concentration measurement. The main objective of this study was to find a new method to generate a chemically nontoxic aerosol with a similar particle size distribution to atmospheric aerosol. We measured the size distribution of aerosols generated by DEHS (di-ethyl-hexyl-sebacate), PSL (poly-styrene latex), olive oil, and 20% sucrose solution with a collision nebulizer in a wide range of 15 nm–20 μm. Individually, none of the solutions generated particles that share a similar size distribution to atmospheric aerosol. We found that the 20% sucrose solution + olive oil mixture solution (Vss:Voo = 1:2) could be used to generate a chemically nontoxic aerosol with similar particle number/volume size distribution to the atmospheric aerosol (t-test, p < 0.05). The differences in the mass-base filtration efficiency measured by the generated aerosol and the atmospheric aerosol were smaller than 2% for MERV 7, 10, 13, and 16 rated filters. The aerosol generated by the new method also performed well in the calibration of optical-principle-based PM2.5 concentration measurement instruments. The average relative difference measured by a tapered element oscillating microbalance (TEOM) and a Dusttrak Model 8530 (calibrated by aerosol generated by the new method) was smaller than 5.8% in the real-situation measurement.

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“…CFD provides the best possible flow dynamics in cyclone separators. Nowadays, optimal cyclone design is being used by using computer-aided methods in order to increase particle collection efficiency and reduce pressure drops [9,10]. However, the performance of the cyclone is greatly influenced by geometric design and operating conditions [11].…”

Section: Introductionmentioning

confidence: 99%

Determination of High Efficiency Standard Cyclone Performance Using Numerical Methods

Uygur

2020

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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The cyclones, one of the dust collection devices, are used to separate the particles or liquid from the carrier gas by centrifugal forces. They have been widely applied in gas-solid separation for an industrial air cleaning process. In addition to being economical, their simplicity of constructions, lack of moving parts, and adaptation to high pressure and temperature conditions make these devices durable and efficient. On the other hand, in the operation of cyclones, the effects of particle, carrier gas, cyclone dimensions, and other factors are very important operational requirements in determining the cyclone performance. In the cyclone design, the terms of pressure drop, and cut-off diameter determine the cyclone performance. In addition, cyclone geometry plays an important role on changes in pressure drop and cut-off diameter values. In this study, high efficiency standard cyclone geometric structure is studied, and this structure is modelled using Solidworks program. Computational Fluid Dynamics (CFD) was used to determine of cyclone separation performance. In the scope of the study, flow analysis is performed, and cut-off diameters are tried to be determined by using statistical learning methods from the results of the analysis.

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Study on flow field characteristics in a reverse rotation cyclone with PIV

Cited by 26 publications

References 25 publications

Numerical simulation and instability analysis of particles in liquid–solid concave‐wall jet using DPM‐RSM

Numerical simulation and instability analysis of particles in liquid–solid concave‐wall jet using DPM‐RSM

A Method to Generate Experimental Aerosol with Similar Particle Size Distribution to Atmospheric Aerosol

Determination of High Efficiency Standard Cyclone Performance Using Numerical Methods

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