Experimental and Numerical (Fluent-VOF, k-ϵ, DPM) Study of Variation of Trap Efficiency of Irregular Hexagonal SIT (Sediment Invert Trap) for Particle Removal in Rectangular Open Drains and Sewers

Beg, Salman; Kaushal, D. R.

doi:10.1061/(asce)ir.1943-4774.0001743

Cited by 5 publications

(2 citation statements)

References 25 publications

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“…2). This study employed a high-speed, low-pressure centrifugal fan to generate negative pressure for particle adsorption [21][22][23]. The negative pressure value of the centrifugal fan typically remained below 1000 Pa, considering the atmospheric pressure as 0 Pa.…”

Section: Aerosol Dispersion and Adsorption Simulation Setupmentioning

confidence: 99%

Study of aerosol dispersion and control in dental practice

He,

Li,

Chen

et al. 2024

Clin Oral Invest

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Objectives In this study, we investigated the dispersion patterns of aerosols and droplets during oral practice, simulated the adsorption characteristics of suction devices, and evaluated the effectiveness of suction devices in reducing aerosols during dental procedures. Materials and MethodsFirstly, the continuous images of oral aerosols and droplets were photographed with a high-speed camera, and the trajectories of these particles were recognized and processed by Image J to determine key parameters affecting particle dispersion: diffusion velocity, distance, and angle.Secondly, based on the parameters data, the flow field of aerosol particles around the oral cavity was simulated using computational fluid dynamics (CFD), and the flow field under adsorption conditions was simulated to demonstrate the aerodynamic characteristics and adsorption efficiencies of the singlechannel and three-channel adsorption ports at different pressures. Finally, according to the simulated data, a three-channel suction device was developed, and the adsorption efficiency of the device was tested by the fluorescein tracer method. ResultsThe dispersion experimental data showed that aerosol particles' maximum diffusion velocity, distance, and angle were 6.2 m/s, 0.55 m, and 130°, respectively. The simulated aerosol flow-field distribution was consistent with the aerosol dispersion patterns. The adsorption simulation results showed that the adsorption efficiency of the single-channel adsorption port could reach 74.05% at -350 pa, and the three-channel port was 99.23% at -350 pa and -150 pa. The adsorption experimental data showed that the adsorption efficiency of three-channel suction device was 97.71%.Conclusions A three-channel suction device was designed by simulations and experiments, which can capture most aerosols in the dental clinic and prevent them from spreading.Clinical relevance Using three-channel suction devices during oral treatment effectively reduces the spread of oral aerosols, which is essential to prevent the spread of epidemics and ensure the health and safety of patients and dental staff.

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Section: Aerosol Dispersion and Adsorption Simulation Setupmentioning

confidence: 99%

Study of aerosol dispersion and control in dental practice

He,

Li,

Chen

et al. 2024

Clin Oral Invest

View full text Add to dashboard Cite

show abstract

“…Regarding taking into account the influence of gas flow on a spatially inhomogeneous change in the concentration of particles interacting with one another under the influence of an arbitrary external physical field [33][34][35][36], the previously proposed models were built either with the assumption that the movement speeds of particles of different sizes are identical, regardless of the sequence of association of small particles into agglomerates (integro-differential models, when the macroscopic evolution of concentrations of particles of different sizes is considered, representing continuous functions that satisfy the integrodifferential equation) [33,34], or as numerical models that require individual tracking of the behavior of local groups of particles throughout the entire period of oscillations (discrete phase model) [35,36]. The latest models are distinguished not only by their enormous computational complexity, but also by their instability to small disturbances in the form of numerical approximation errors, and they also produce multiple errors in calculations when trying to take into account the collision of particles from different groups due to the force of hydrodynamic interaction, and not the difference in the translational motion velocities of groups of particles.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Simulation of the Influence of Acoustic on the Efficiency of PM 2.5 Coagulation

Khmelev,

Shalunov,

Golykh

2024

Mathematics

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The particles of micron and submicron sizes (PM 2.5 and less) in gas environments pose a significant danger to humanity due to the emergence of specific and very dangerous diseases of the cardiovascular, respiratory, and immune systems of the human body. Such particles are the most difficult to detect; therefore, their effects on human health have only been discovered in recent decades. Classical ultrasonic coagulation by sinusoidal action turns out to be ineffective for PM 2.5 due to the peculiarities of the physical mechanisms of hydrodynamic and orthokinetic interaction realized in gaseous media. This article presents a theoretical justification for choosing ways to increase the efficiency of ultrasonic coagulation of PM 2.5 by creating special conditions under which nonlinear disturbances of the velocity and pressure of the gas phase in the ultrasonic field occur. The authors performed simulations of ultrasonic coagulation under nonlinear disturbances of the velocity (vortex) and the pressure (shock waves), which has numerical difficulties due to the instability of existing methods. As a result of the numerical analysis, the possibility of increasing the coagulation rate of particles in the submicron size range up to limit values (13 times due to nonlinear pressure disturbances, and an additional increase of at least 2 times due to aerosol compaction in the vortex field of gas velocity) was shown.

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Significance of including lid thickness and particle shape factor in numerical modeling for prediction of particle trap efficiency of invert trap

Beg

Kaushal

2024

Water Science and Engineering

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Experimental and Numerical (Fluent-VOF, k-ϵ, DPM) Study of Variation of Trap Efficiency of Irregular Hexagonal SIT (Sediment Invert Trap) for Particle Removal in Rectangular Open Drains and Sewers

Cited by 5 publications

References 25 publications

Study of aerosol dispersion and control in dental practice

Study of aerosol dispersion and control in dental practice

Mathematical Simulation of the Influence of Acoustic on the Efficiency of PM 2.5 Coagulation

Significance of including lid thickness and particle shape factor in numerical modeling for prediction of particle trap efficiency of invert trap

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