A model for evaluating the particle penetration efficiency in a ninety-degree bend with a circular-cross section in laminar and turbulent flow regions

Cong, Xiaochun; Yang, Gyeong-Su; Qu, Jianwu; Zhao, Jiyuan

doi:10.1016/j.powtec.2016.10.074

Cited by 15 publications

(3 citation statements)

References 36 publications

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“…To enhance the knowledge in the deposition process, many experimental (Johnston and Muir, 1973;Johnston et al, 1977;Vahaji et al, 2015;Landahl and Herrmann, 1949;Safari Pour et al, 2018;Peters and Leith, 2004;Pui et al, 1987) and numerical (Arsalanloo and Abbasalizadeh, 2017;Berrouk et al, 2007;Breuer et al, 2006;Cong et al, 2017;McFarland et al, 1997;Vahaji et al, 2018Vahaji et al, , 2019Peng and Cao, 2016;Pilou et al, 2011;Tian et al, 2008;Tsai and Pui, 1990;Wilson et al, 2011) studies have been performed. The effects of particle size and flow rate on deposition was studied (Cheng et al, 1999;Grgic et al, 2004a), as well as the effect of pipe bend geometry (Grgic et al, 2004a;Heenan et al, 2004;Nicolaou and Zaki, 2013), and different Reynolds numbers and curvature ratios (Johnston and Muir, 1973;Johnston et al, 1977;Landahl and Herrmann, 1949;Pui et al, 1987).…”

Section: Introductionmentioning

confidence: 99%

Sedimentation effects on particle position and inertial deposition in 90° circular bends

Vahaji,

Nguyen,

Shang

et al. 2021

Preprint

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Laminar fluid-particle flows in bend geometries are present in many industrial, pharmaceutical, and biomedical applications. Particle deposition has been studied extensively; however, little attention has been paid to the effect of particle sedimentation on particle position and deposition in different pipe geometry combinations. This study presented a comprehensive analysis of sedimentation effects on particle flow behaviour in 90 • circular pipe bends of micron particles in laminar pipe flows. Pipe geometry combinations consisted of eight pipe diameters, nine bend radii, and 30 particle diameters in a range of 1 to 100 µm. The results demonstrated the locations of particles that sedimented to the bottom half of the straight pipe section, and the particle positions upstream from the pipe bend entrance, which was no longer in a fully developed profile. These new locations represent the effects of gravity, pulling the particles down. While obtaining these positions can be found through CFD analysis, we proposed an analytical solution to predict the particle trajectory from different release locations that would help to identify the initial particle distribution at locations upstream to the bend, to obviate the need for long upstream straight pipe sections in the CFD analysis.

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Section: Introductionmentioning

confidence: 99%

Sedimentation effects on particle position and inertial deposition in 90° circular bends

Vahaji,

Nguyen,

Shang

et al. 2021

Preprint

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“…ese nano-and microparticles will commonly flow into enclosed places like window cracks, sampling pipes, or ventilation ducts [3]. Generally, these enclosed places own certain bends or curved ducts, which play a significant role of changing the air and particle flow directions [4,5].…”

Section: Introductionmentioning

confidence: 99%

Experimental Views of Tran-Bend Particle Deposition in Turbulent Flow with Nanoscale Effect

Zhou

Sun

Jiang

et al. 2018

Journal of Nanotechnology

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This paper presented experimental views of nano- and microaerosol distribution and deposition in turbulent tran-bend flows. These views included the particle flow measurement and particle depositions through individual bends, bifurcation bends, and those behind bends. Selected experiments were summarized and compared according to the gas flow, the bend geometry, and the particle flow properties. Based on recent studies, the influencing factors of environmental humidity, particle and surface properties, nanoparticle formation, coagulation, or evolution phenomena were discussed, and then research suggestions were given for future research and applications. It is specially mentioned that the new particle formation and nanoparticle growth affect its deposition under environmental contaminant conditions; nanoscale particle dynamics and transport have a growing trend on attracting the research and industry attentions.

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“…Fresh air flow is horizontal when it passes through the fresh air duct, and turns 90 degree when it is combined with return air to form supply air. The deposition of bacteria emitted from the fresh air duct could be much less than fungi due to the smaller sizes of bacteria (Cong et al, 2017). Therefore, the fungal emission rate is less than the bacteria emission rate of the fresh air duct.…”

Section: Results Of Bioaerosol Emission Ratesmentioning

confidence: 99%

Contribution of bioaerosol emission from air-conditioning and mechanical ventilation system to indoor bioaerosol concentration

Xiong¹

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A model for evaluating the particle penetration efficiency in a ninety-degree bend with a circular-cross section in laminar and turbulent flow regions

Cited by 15 publications

References 36 publications

Sedimentation effects on particle position and inertial deposition in 90° circular bends

Sedimentation effects on particle position and inertial deposition in 90° circular bends

Experimental Views of Tran-Bend Particle Deposition in Turbulent Flow with Nanoscale Effect

Contribution of bioaerosol emission from air-conditioning and mechanical ventilation system to indoor bioaerosol concentration

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