Numerical study on particle deposition in rough channels with different structure parameters of rough elements

Wang, Hong; Wang, Xin; Zheng, Jianxiang

doi:10.1016/j.apt.2018.08.010

Cited by 14 publications

(7 citation statements)

References 39 publications

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“…The fluid flow in the duct is fully turbulent and the velocity profiles in the smooth and rough sections are plotted in Figure 5. It can be seen that the rough 38 4.12 1.06 Hong 5 4.1 1 elements have an effect on the original boundary layer produced in the duct. At the length L = 400 mm, the boundary layer is changed and the boundary layer thickness increases as the increase in roughness.…”

Section: Resultsmentioning

confidence: 99%

“…Lohaz et al perform simulation analysis of particulate flow by applying Large Eddy Simulation method and found the results for eddy length to diameter ratio are 4.12 and 1.06 for both eddies, respectively. 38 Similarly, Hong et al 5 investigated the eddy formation process in the ductwork system by using Reynolds stresses model and the results obtained are 4.1 and 1 eddy length to diameter ratio for the eddies produced, respectively. The results obtained in present work are very much comparable as shown in Table 2 and the model used is applicable for further use with various flow conditions.…”

Section: Model Validationmentioning

confidence: 99%

“…Most people spend almost 20 h per day at indoor places, it becomes a serious concern and equally important to improve the indoor air quality by removing the dust particles from the air. 5,6 The particles in the air are highly affected by turbulence causing dispersion or clustering depending on the size of the particles and fluid characteristics. 7,8 There exist different ways to remove the inertial particles from the air by enhancing turbulence and the particles deposition using roughened surface of the duct is one of the emerging techniques.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of particles deposition in a square duct using optimized roughness elements for a sustainable environment

Rizwan

Farooq

Riaz

et al. 2021

Advances in Mechanical Engineering

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A sustainable environment is one of the major challenges in developing countries especially in populated regions due to the industrialization and expansion of urban areas. The industries emit particulate matter into the atmosphere that is harmful to human health. There is a need for an efficient particle separation mechanism to improve indoor air quality. This paper presents a numerical investigation of particles deposition in a square duct with variable roughness elements. The working fluid was taken as a mixture of air and inert particles. The Reynolds Stress Model (RSM) and Discrete Particle-phase Model (DPM) were used to simulate the particle-laden flow to analyze the deposition and velocity of the particles in the duct. The diameter of the particles is taken as 5 µm. The ratio of roughness height to the diameter ( r/ D) ranged from 0.024 and 0.101 and the spacing to the diameter ratio ( s/ D) varied between 9.8 and 39.23. It was found that the roughness height has a significant effect on the fluid flow as compared to the spacing between the elements. As a result, more uniform vortices are developed across the elements increasing fluid velocity from 10 to 14 m/s, while the deposition and velocity of the particles were increased by 14% and 8%, respectively. Accordingly, the particles deposition technique helps provide clean indoor air for better environmental sustainability.

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Section: Resultsmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of particles deposition in a square duct using optimized roughness elements for a sustainable environment

Rizwan

Farooq

Riaz

et al. 2021

Advances in Mechanical Engineering

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“…Among the three different rib shapes, the circular shape demonstrates the least particle deposition, while the square-shaped rib has the highest. Hong et al [19] conducted a two-dimensional numerical study on particle deposition on structured elements from gas flow. The range of the height and the spacing of the elements are 0.4~2 mm and 4~16 mm, respectively, and the diameter of the channel is 20 mm.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Topography on Particle Deposition from Liquid Suspensions in Channel Flow

Zaw¹,

Zhu²,

Ma³

2020

Fluids

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A Eulerian—Lagrangian model has been developed to simulate particle attachment to surfaces with arc-shaped ribs in a two-dimensional channel flow at low Reynolds numbers. Numerical simulation has been performed to improve the quantitative understanding of how rib geometries enhance shear rates and particle-surface interact for various particle sizes and flow velocities. The enhanced shear rate is attributed to the wavy flows that develop over the ribbed surface and the weak vortices that form between adjacent ribs. Varying pitch-to-height ratio can alter the amplitude of the wavy flow and the angle of attack of the fluid on the ribs. In the presence of these two competing factors, the rib geometry with a pitch-to-height ratio of two demonstrates the greatest shear rate and the lowest fraction of particle attachment. However, the ribbed surfaces have negligible effects on small particles at low velocities. A force analysis identifies a threshold shear rate to reduce particle attachment. The simulated particle distributions over the ribbed surfaces are highly non-uniform for larger particles at higher velocities. The understanding of the effect of surface topography on particle attachment will benefit the design of surface textures for mitigating particulate fouling in a wide range of applications.

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“…The uneven distribution of particles in the rough fracture was studied in experiments as well (Huang et al, 2018;Tan et al, 2017;Zou et al, 2015). On the other hand, various numerical simulation works obtained more detailed information on particle deposition characteristics, such as the effects of the micro shape of the rough channel (Dorari et al, 2015;Hemmati and Rafee, 2018;Hong et al, 2018). However, the compressive numerical investigation is still worth implementing.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on particle transport and deposition in rough fractures

Wang

Gong

et al. 2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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The transport and deposition of particulate materials through fractures is widely involved in environmental engineering and resource development engineering. A 3D Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) coupling method was used to investigate the particle and fluid flow. The Gauss Model was applied to construct the rough surfaces. First, the numerical results were compared with the previous results and reasonable agreements were obtained. Second, the results indicated a novel flow pattern of particles in rough fractures. Then, a comprehensive particle sedimentary analysis indicated that the deposition distance of particles was inversely proportional to the particle size and density ratio. In addition, the particle deposition rates were increased by the mean roughness and there was an uneven sediment distribution impacted by roughness. Reasons for this uneven sediment distribution were analyzed in detail. Moreover, the bridge plugs of particles considering the closure of fractures were simulated as well. A part of particulate materials would be filtered at the inlet due to size effect and the transport distance of entered particles decreased significantly when the particle was large. A critical particle radius (R < 0.27 mm) that can flow through closure fracture in this work was found. This work can provide a clear insight into the migration and deposition characteristics of particles in the rough fractures underground.

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Numerical study on particle deposition in rough channels with different structure parameters of rough elements

Cited by 14 publications

References 39 publications

Investigation of particles deposition in a square duct using optimized roughness elements for a sustainable environment

Investigation of particles deposition in a square duct using optimized roughness elements for a sustainable environment

Effect of Surface Topography on Particle Deposition from Liquid Suspensions in Channel Flow

Numerical study on particle transport and deposition in rough fractures

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