Numerical simulation of a dense flow cyclone using the kinetic theory of granular flow in a dense discrete phase model

Hwang, In Sik; Jeong, Hyo Jae; Hwang, Jungho

doi:10.1016/j.powtec.2019.08.008

Cited by 36 publications

(16 citation statements)

References 33 publications

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“…Baskakov et al [32] and Muschelknautz and Brunner [8] have reported a decrease in the pressure drop up to a specific amount of solids loading, followed by an increase. A similar trend is also observed in other experimental [33] and CFD simulation studies [34,35]. This behavior is attributed to the increase of the frictional pressure loss due to the presence of particles near the walls.…”

Section: Effect Of Solids Loading On Cyclone Performancesupporting

confidence: 88%

“…Muschelknautz and Brunner [8] reported an 85% reduction in the tangential velocity peak by increasing the solids loading from 0 to around 20 kg s /kg g . At low mass loadings, the decrease in the vortex finder pressure loss is more pronounced, leading to the reduction of the overall pressure loss, whereas when the particle mass loading is sufficiently high, the vortex finder pressure loss becomes negligible due to a very weak tangential swirl and the frictional pressure drop still increases with the loading of particles [35]. As a consequence, the overall pressure drop starts to increase with the solids loading after reaching a minimum value.…”

Section: Effect Of Solids Loading On Cyclone Performancementioning

confidence: 97%

“…As for the third category of CFD studies, category (III), compared to the previous categories, there are fewer E-L studies with two-way coupling [34,77,[98][99][100][101][102][103][104][105] and only a limited number of studies with four-way coupling [35,[106][107][108][109]. In almost all of the studies (except [99]), due to the lack of available experimental data for the cyclone flow loaded with particles, no comparison of the predicted modification of velocity profiles (compared to the single-phase flow) with the measurements is provided.…”

Section: E-l and Hybrid Model Simulationsmentioning

confidence: 99%

“…In almost all of the studies (except [99]), due to the lack of available experimental data for the cyclone flow loaded with particles, no comparison of the predicted modification of velocity profiles (compared to the single-phase flow) with the measurements is provided. Instead, the predicted overall/grade efficiencies [34,77,101,102] and/or pressure drops [34,35,98,101,102,106,107,109] are compared with the measurements for certain ranges of particle mass loading. A summary of the existing four-way coupled CFD studies of gas-solid cyclones operating at ambient temperature and with inlet mass loading ratios higher than 0.1 kg s /kg g is presented in Table 2.…”

Section: E-l and Hybrid Model Simulationsmentioning

confidence: 99%

“…The authors have claimed that this discrepancy is due to the simplification of the CFD model, neglecting particle-particle collisions and agglomeration. Both CFD-DEM [107][108][109] and hybrid E-E and E-L approaches [35,106] have been used to consider the effect of particle-particle interactions in existing cyclone separator simulation studies. In the CFD-DEM study of Zhou et al [107], the effect of large (2000-2800 µm) and "ultra light" particles with a solid to gas density ratio of 33 is investigated for different loadings of particles up to 0.46 kg s /kg g .…”

Section: Effect Of Solids Loadingmentioning

confidence: 99%

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CFD Modeling of Gas–Solid Cyclone Separators at Ambient and Elevated Temperatures

Nakhaei

Tian

et al. 2020

Processes

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Gas–solid cyclone separators are widely utilized in many industrial applications and usually involve complex multi-physics of gas–solid flow and heat transfer. In recent years, there has been a progressive interest in the application of computational fluid dynamics (CFD) to understand the gas–solid flow behavior of cyclones and predict their performance. In this paper, a review of the existing CFD studies of cyclone separators, operating in a wide range of solids loadings and at ambient and elevated temperatures, is presented. In the first part, a brief background on the important performance parameters of cyclones, namely pressure drop and separation efficiency, as well as how they are affected by the solids loading and operating temperature, is described. This is followed by a summary of the existing CFD simulation studies of cyclones at ambient temperature, with an emphasis on the high mass loading of particles, and at elevated temperatures. The capabilities as well as the challenges and limitations of the existing CFD approaches in predicting the performance of cyclones operating in such conditions are evaluated. Finally, an outlook on the prospects of CFD simulation of cyclone separators is provided.

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Section: Effect Of Solids Loading On Cyclone Performancesupporting

confidence: 88%

Section: Effect Of Solids Loading On Cyclone Performancementioning

confidence: 97%

Section: E-l and Hybrid Model Simulationsmentioning

confidence: 99%

Section: E-l and Hybrid Model Simulationsmentioning

confidence: 99%

Section: Effect Of Solids Loadingmentioning

confidence: 99%

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CFD Modeling of Gas–Solid Cyclone Separators at Ambient and Elevated Temperatures

Nakhaei

Tian

et al. 2020

Processes

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Numerical Investigation of Cyclone Separators: Physical Mechanisms and Theoretical Algorithms

El‐Emam,

Zhou,

Yasser

2024

ChemBioEng Reviews

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Gas‐particle aero‐type cyclones have revolutionized biochemical processes, engineering industries, and environmental pollution protection by effectively separating particles from gas. These devices rely on gravitational energy and centrifugal force to dissipate particle phase energy, but achieving optimal energy efficiency while minimizing pressure drop remains challenging. This has led to the development of various cyclone designs in commercial industries, each with unique energy efficiency characteristics. The intricate gas‐particle flow inside cyclones is a critical issue impacted by cyclone geometry, operating conditions, and media parameters. Advanced numerical simulations have been employed to understand this complex flow pattern better, offering researchers valuable insights into the mechanisms of different cyclone separators. This comprehensive review explores the available numerical methods in the literature on cyclones and their corresponding validations. Computational numerical modeling is a promising technique for predicting cyclone energy efficiency, gas‐particle behavior, and overall performance. This investigation delves into the progress and numerical forms of gas‐particle flow cyclones, examining how different parameters impact cyclone performance and flow patterns within the two‐phase flow. The future developments and challenges that may further promote the development of aero‐type cyclone separators, providing theory and engineering support for future cyclone designs, are also covered. As a result, it can confidently be reported that aero‐type cyclone separators remain a critical component in various industrial sectors, offering energy‐efficient solutions for mitigating environmental pollutants and gas‐particle separation systems. With continued development and research, these devices will undoubtedly shape the future of energy processes and engineering industries, ushering in a new era of sustainability and efficiency.

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Effects of vortex finder length on flow field and collection efficiency of cyclone in an industrial‐scale circulating fluidized bed boiler: Numerical study

2020

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Numerical simulation of a dense flow cyclone using the kinetic theory of granular flow in a dense discrete phase model

Cited by 36 publications

References 33 publications

CFD Modeling of Gas–Solid Cyclone Separators at Ambient and Elevated Temperatures

CFD Modeling of Gas–Solid Cyclone Separators at Ambient and Elevated Temperatures

Numerical Investigation of Cyclone Separators: Physical Mechanisms and Theoretical Algorithms

Effects of vortex finder length on flow field and collection efficiency of cyclone in an industrial‐scale circulating fluidized bed boiler: Numerical study

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