Effect of the ‘end of the vortex’ phenomenon on the particle motion and separation in a swirl tube separator

Pisarev, Gleb I.; Hoffmann, Alex C.

doi:10.1016/j.powtec.2012.02.006

Cited by 26 publications

(3 citation statements)

References 7 publications

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“…The solver type of run was chosen as full, and after post-treatment, an internal streamline diagram, wall shear diagram, wall pressure diagram and middle section pressure diagram were obtained for analysis. Detailed simulation procedures and swirling aerosol behavior have also been described by Pisarev and Hoffmann ( 31 ).…”

Section: Methodsmentioning

confidence: 99%

Detecting SARS-CoV-2 in the Breath of COVID-19 Patients

et al. 2021

Front. Med.

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In the COVID-19 outbreak year 2020, a consensus was reached on the fact that SARS-CoV-2 spreads through aerosols. However, finding an efficient method to detect viruses in aerosols to monitor the risk of similar infections and enact effective control remains a great challenge. Our study aimed to build a swirling aerosol collection (SAC) device to collect viral particles in exhaled breath and subsequently detect SARS-CoV-2 using reverse transcription polymerase chain reaction (RT-PCR). Laboratory tests of the SAC device using aerosolized SARS-CoV-2 pseudovirus indicated that the SAC device can produce a positive result in only 10 s, with a collection distance to the source of 10 cm in a biosafety chamber, when the release rate of the pseudovirus source was 1,000,000 copies/h. Subsequent clinical trials of the device showed three positives and 14 negatives out of 27 patients in agreement with pharyngeal swabs, and 10 patients obtained opposite results, while no positive results were found in a healthy control group (n = 12). Based on standard curve calibration, several thousand viruses per minute were observed in the tested exhalations. Furthermore, referring to the average tidal volume data of adults, it was estimated that an exhaled SARS-CoV-2 concentration of approximately one copy/mL is detectable for COVID-19 patients. This study validates the original concept of breath detection of SARS-CoV-2 using SAC combined with RT-PCR.

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Section: Methodsmentioning

confidence: 99%

Detecting SARS-CoV-2 in the Breath of COVID-19 Patients

et al. 2021

Front. Med.

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“…The mixture of coal, water and gas flows through the coal-water-gas reception section and enters the coal-water-gas separation section. The principle of swirl M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 11 separation is adopted in this instrument (Pisarev and Hoffmann, 2012;Xue et al, 2013). The mixture is swirled by the swirler.…”

Section: Coal-water-gas Separation Techniquementioning

confidence: 99%

Novel integrated techniques of drilling–slotting–separation-sealing for enhanced coal bed methane recovery in underground coal mines

Zou

Lin

Zheng

et al. 2015

Journal of Natural Gas Science and Engineering

163

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Coal bed Methane (CBM), a primary component of natural gas, is a relatively clean source of energy.Nevertheless, the impact of considerable coal mine methane emission on climate change in China has gained an increasing attention as coal production has powered the country's economic development. It is well-known that coal bed methane is a typical greenhouse gas, the greenhouse effect index of which is 30 times larger than that of carbon dioxide. Besides, gas disasters such as gas explosive and outburst, etc. pose a great threat to the safety of miners. Therefore, measures must be taken to capture coal mine methane before mining. This helps to enhance safety during mining and extract an environmentally friendly gas as well. However, as a majority of coal seams in China have low-permeability, it is difficult to achieve efficient methane drainage. Enhancing coal permeability is a good choice for high-efficiency drainage of coal mine methane. In this paper, a modified coal-methane co-exploitation model was established and a combination of drilling-slotting-separation-sealing was proposed to enhance coal permeability and CBM recovery. Firstly, rapid drilling assisted by water-jet and significant permeability enhancement via pressure relief were investigated, guiding the fracture network formation around borehole for high efficient gas flow. Secondly, based on the principle of swirl separation, the coal-water-gas separation instrument was developed to eliminate the risk of gas accumulation during slotting and reduce the gas emission from the ventilation air. Thirdly, to improve the performance of sealing material, we developed a novel cement-based composite sealing material based on the microcapsule technique. Additionally, a novel sealing-isolation combination technique was also proposed. Results of field test indicate that gas concentration in slotted boreholes is 1.05-1.91 times higher than that in conventional boreholes. Thus, the proposed novel integrated techniques achieve the goal of high-efficiency coal bed methane recovery.

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“…Separators have been the subject of extensive experimental, analytical, and numerical studies [2][3][4][5][6][7][8]. Due to complicated 3-D (three-dimensional), strongly swirl, turbulent, two-phase flows, the majority of studies were numerical in nature.…”

Section: Introductionmentioning

confidence: 99%

Double vortex generators for increasing the separation efficiency of the air separator

Jawarneh¹,

Al‐Widyan²,

Al-Migdady³

et al. 2017

IJHT

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This article presents a numerical analysis of multi-phase flow with powerful swirling streams in a cylindrical separator equipped with two vortex generators in an attempt to predict the separation efficiency of an air-water mixture. New design of a cylindrical separator is introduced for air-water mixture.The mixture multiphase and large eddy simulation (LES) turbulence models were applied. Images that concern velocity field, pressure, and volume fraction are introduced. Air phase is trapped and localized along the centerline of the separator and then migrates toward the upper exit hole, while water phase is distributed and rotated along the wall, then confined at the mid-separator due to two strong clock-wise centrifugal forces before it is expelled through its exit at mid of separator. It was found that the separation efficiency at constant Reynolds number of 8×10 4 with two feeding volume fractions of 95% and 90% are 97.8% and 96.1%, respectively. Also, the separation efficiency at constant feeding volume fraction of 95% with two Reynolds numbers of 2×10 5 and 8×10 4 are 98.6% and 97.8%, respectively. It is revealed that the separation efficiency will increase as the Reynolds number increases and/or increasing the volume fraction.

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Effect of the ‘end of the vortex’ phenomenon on the particle motion and separation in a swirl tube separator

Cited by 26 publications

References 7 publications

Detecting SARS-CoV-2 in the Breath of COVID-19 Patients

Detecting SARS-CoV-2 in the Breath of COVID-19 Patients

Novel integrated techniques of drilling–slotting–separation-sealing for enhanced coal bed methane recovery in underground coal mines

Double vortex generators for increasing the separation efficiency of the air separator

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