Effect of a Stick on the Gas Turbulence Structure in a Cyclone Separator

Wang, Jianjun; Wang, Lianze; Liu, Cheng-Wen

doi:10.1080/02786820500182404

Cited by 16 publications

(7 citation statements)

References 12 publications

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“…However, at inlet velocity of 16.72 m s -1 and fibrous filter width of 4 mm, the penetration is higher than that of the cyclone for the particle size of 1.0 μm. This is because the cyclone flow field was disturbed by the filters, similar to the results of Wang et al (2005). They reported that the insertion of the stick into the cyclone changed the cyclonic flow distribution by decreasing the tangential velocity and increasing the turbulence intensity.…”

Section: Effect Of Particle Size For the Combined Cyclone-fibrous Filsupporting

confidence: 74%

“…4.7 shows that the pressure drop of combined cyclone-filter collectors is smaller than that of cyclone. This is due to the presence of the filter causes the increasing of the turbulence intensity affecting in the reduction of tangential velocity (Wang et al 2005). For the cyclone combined with fibrous filter 4-mm and 8-mm-width, the pressure drop is lower by 32.7 and 38.8%, respectively.…”

Section: Pressure Drop Of the Combined Cyclone-filter Collectormentioning

confidence: 89%

“…Wang et al (2005) studied the insertion of a stick into the cyclone. One end of the stick is fixed at the point (radius of 54 mm and direction of 175°) on the top cover of the cyclone separator, and the other is fixed at the cone bottom in the same azimuth.…”

Section: Additional Devicesmentioning

confidence: 99%

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Performance of a Combined Cyclone-Filter Aerosol Collector

Sangkhamanee

Tekasakul

et al. 2011

Particulate Science and Technology

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Cyclone collector is one of the most widely used as industrial devices for coarse particle removal from gas stream, mostly used as the pre-cleaner before other methods such as filtration. This is due to the low collection efficiency of cyclone for fine particles. In this work a lab-scale cyclone was modified by adding filter in the space between the inner core and the wall of the cyclone in order to meet the higher collection performance for the fine particles (0.3 -1.0 μm). The collection performance of the combined cyclone-filter collector was compared with those of cyclone and filter only. The effects of parameters, such as particle size and inlet velocity, on the collection efficiency and pressure drop were studied. Besides, filter characteristics were also investigated. The results show that the aerosol penetration for the test cyclone collector decreases with increasing inlet velocities or particle sizes. Moreover, the theoretical calculations show the best fit for Crawford model at all inlet velocities. In comparison with the cyclone, the penetration of the cyclone combined with fibrous filter for particle sizes of 0.3, 0.5 and 1.0 μm is found to be lower by 0.4 -2.2%, 0.6 -6.2% and 3.2 -9.4%, respectively, for 4-mm filter width and 0.3 -5.5% , 1.3 -15.8% and 1.7 -19.9%, respectively, for 8-mm filter width.The penetration of the cyclone combined with stainless steel filter is also found to be lower by 0.6 -4.7% , 0.8 -13.7% and 1.1 -20.9%, respectively, for 0.94 g of stainless steel filter and 3.7 -14.8% , 4.3 -31.2% and 11.6 -41.2%, respectively, for 1.83 g of stainless steel filter. Moreover, the pressure drop of the cyclone combined with 4-mm and 8-mm fibrous filter is lower than that of the cyclone by 32.7 and 38.8% for 4 mm and 8 mm fibrous filter, respectively, and 23.5 and 20.5% for 0.94 g and 1.83 g of stainless steel filter, respectively.

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Section: Effect Of Particle Size For the Combined Cyclone-fibrous Filsupporting

confidence: 74%

Section: Pressure Drop Of the Combined Cyclone-filter Collectormentioning

confidence: 89%

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Performance of a Combined Cyclone-Filter Aerosol Collector

Sangkhamanee

Tekasakul

et al. 2011

Particulate Science and Technology

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“…Hoffman et al [22] and Safikhani et al [23] concentrated on study of the height of the cyclones. Furthermore, the effect of holes in the cyclone and hem of the internal walls of the cyclone was studied by Wang et al [24] and Farahani et al [25] respectively. Su and Mao [26], Safikhani et al [27] and Su et al [28] investigated the performance of the rectangular cyclone.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Flow Field in New Design Dynamic Cyclone Separators

Safikhani

Esmaeili

Salehfard

2020

IJE

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In this paper the numerical simulation of flow field in the new design dynamic cyclone separator is investigated. The effects of different geometrical parameters such as impeller diameter, number of vanes, length and the location of impeller is investigated. The Reynolds averaged Navier-Stokes equations with Reynolds stress turbulence model (RSM) were solved. The Eulerian-Lagrangian computational procedure is used to predict particles tracking in the cyclones. The velocity fluctuations are simulated using the Discrete Random Walk (DRW). Results show that in new design dynamic cyclone, the collection efficiency is higher and the pressure drop is lower in compare with other studied on cyclones. Installing impeller at the lower positions leads to a decrease in efficiency. With increase in impeller diameter, pressure drop in dynamic new design decreases. Finally, with increase in impeller length, efficiency increases and pressure drop decreases.

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“…Experiments have been conducted with laser Doppler velocimetry (LDV) techniques to measure the mean and fluctuating velocity components inside a cyclone. Wang et al (2005) measured the turbulent structure of flow field and analyzed a flow wake region downstream of a stick inserted into a cyclone. Erdal and Shirazi (2004) conducted measurements at 24 axial locations in a cylindrical cyclone to understand the swirling flow behavior.…”

Section: Introductionmentioning

confidence: 99%

Numerical Performance Simulation of a Wetted Wall Bioaerosol Sampling Cyclone

McFarland

2007

Aerosol Science and Technology

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Computational fluid dynamics techniques are used to study the performance of an axial flow bioaerosol sampling cyclone that continuously collects particles onto a flowing liquid film. A special shellvolume concept was developed to study formation and development of the liquid film on the inner wall of the cyclone. For a previous version of the cyclone, simulations demonstrated the presence of a ring of liquid in the region just upstream of the liquid skimmer that was suspected of causing liquid carryover into the exhaust air stream and degradation in aerosol collection efficiency. This ring was eliminated by redesign of the cyclone. For the upgraded version of the cyclone, CFD was used to successfully predict aerosol collection efficiency and cyclone pressure drop. The simulations reveal a complex flow evolution inside the cyclone. Stream-tubes are used to describe a significant narrowing of the width of the airflow as it enters the cyclone and an inward displacement of the flow as it travels in the axial direction. The particle deposition occurs primarily in a region that is subtended approximately by the length of the rectangular entrance slot and the first half turn of the flow in the cyclone. Cutpoint Stokes number is about 0.05 and the cutpoint particle size is about 1 μm aerodynamic diameter. At a flow rate of 1250 L/min, the pressure drop across the cyclone is 5.6 kPa (22 inches of water).

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Effect of a Stick on the Gas Turbulence Structure in a Cyclone Separator

Cited by 16 publications

References 12 publications

Performance of a Combined Cyclone-Filter Aerosol Collector

Performance of a Combined Cyclone-Filter Aerosol Collector

Numerical Study of Flow Field in New Design Dynamic Cyclone Separators

Numerical Performance Simulation of a Wetted Wall Bioaerosol Sampling Cyclone

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