Measurement of the electrostatic charge in airborne particles: II - particle charge distribution of different aerosols

Rodrigues, Marcos Vinícius; Marra, W.D.; Almeida, Raimunda Gonçalves de; Coury, José Renato

doi:10.1590/s0104-66322006000100014

Cited by 18 publications

(6 citation statements)

References 4 publications

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“…In this study, we consider ξ = 0 (no charge) and ξ = 0.1, representative of typical values for charge measured in dustry turbulent pipe flows [98,99,100]. The Hamaker constant, A, is varied between 10 −20 J for weakly cohesive particles (e.g., silica) to 10 −18 J for strongly cohesive materials such as metal oxides [101].…”

Section: System Configurationmentioning

confidence: 99%

Multi-fidelity uncertainty quantification of particle deposition in turbulent pipe flow

Yuan¹,

Huan²,

Capecelatro³

2022

Preprint

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Particle deposition in fully-developed turbulent pipe flow is quantified taking into account uncertainty in electric charge, van der Waals strength, and temperature effects. A framework is presented for obtaining variance-based sensitivity in multiphase flow systems via a multi-fidelity Monte Carlo approach that optimally manages model evaluations for a given computational budget. The approach combines a high-fidelity model based on direct numerical simulation and a lower-order model based on a one-dimensional Eulerian description of the two-phase flow. Significant speedup is obtained compared to classical Monte Carlo estimation. Deposition is found to be most sensitive to electrostatic interactions and exhibits largest uncertainty for mid-sized (i.e., moderate Stokes number) particles.

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Section: System Configurationmentioning

confidence: 99%

Multi-fidelity uncertainty quantification of particle deposition in turbulent pipe flow

Yuan¹,

Huan²,

Capecelatro³

2022

Preprint

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“…The electric charge that can be deposited on the electrostatic probe is positioned on the surface of the particles. Assuming the particles have a constant surface-charge density, larger particles can carry higher charges than smaller particles [20]. This is also the reason why AC component of the electrostatic signal (induction) is in positive correlation with mean diameter of particles [21].…”

Section: Fig 5 Electrostatic Signal In Relation To Particles' Sizementioning

confidence: 99%

“…The efforts to correlate the electrostatic signals to particle size are reported in [19]. The phenomenon that larger particles carry higher charge [20] and that consecutively an electrostatic signal with a higher magnitude implies larger particles passing through the electrode forms the fundamental basis for the research presented in [21]. Electrostatic measurements and characterization of fine particles in diesel engine exhaust is reviewed in [22].…”

Section: Introductionmentioning

confidence: 99%

An electrostatic measuring technique for monitoring particle size in dilute pneumatic transport

Kuštrin

Jurjevčič²,

Senegačnik

2020

THERM SCI

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The goal of this research is to establish the applicability of an electrostatic measuring technique for monitoring the quality of a coal-milling process in direct-firing systems. Such systems are used in large steam boilers fired with low-rank coal where the pulverized coal is transported pneumatically from the mills to the burner nozzles via ducts with large cross-sections. The electrostatic measuring method, in connection with intrusive rod-type sensors, was studied because it provides good spatial sensitivity and cost effectiveness. A laboratory test rig was constructed, where the pulverized coal carried by ambient air was employed for the experiments emulating the pneumatic transport of coal particles in direct-firing systems. The test rig enables an extensive variation of the most influential parameters, like the mass flow, the velocity and the size of the particles. A linear, multiregression analysis of the results of the experiments was carried out and the appropriate regression model enabling a determination of the mean diameter of the particles using the electrostatic signal was chosen. Based on the results of the study the electrostatic measuring technique can be used for monitoring the size of pneumatically transported particles. The appropriate regression model needs to be chosen for each particular application to describe the dependency of the acquired electrostatic signal on the influential parameters of the pneumatic transport.

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“…1. The required experimental equipment include: aerosol generator, aerosol charger, aerosol charge measurements (ECC) [4], filtration rig, filter media, flow meter, valves, vacuum pump and a particle diameter analyzer (APS 3320 by TSI). A particle-free air stream, kept dry by passing through a silica gel column, was fed to disperse the powder, a TSI Powder Disperser, model 3433.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Filtration of Electrified Solid Particles in a Fibrous Filter

Rodrigues

Barrozo

Coury

2010

MSF

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The aim of the present work is to verify experimentally the influence of the charge level on collection efficiency during the first stages of filtration. A charge classifier was used to measure the charge level of the aerosol as a function of particle diameter. The filter was made of polypropylene with diameter of 0.047 m and a thickness of 2.6 mm. The solid particles used as test dust were a phosphate rock powder (density 2940 kg/m3 and average Stokes diameter of 3.40 m). The aerosol was dispersed by a TSI Venturi type generator. The particle charging was achieved by a corona charger. In all the tests performed, a linear relation between the particles acquired charge and their diameter was observed. A gradual increase of the charge level was observed with an increase of the tension in the corona charger (0, -3, -6 kV). The filtration results indicated that the global collection efficiency of the filter was very sensitive to the variation of the charge level of the particles. Both efficiency and pressure drop increased when the charge level increased. During the tests, the small increase in pressure drop indicated that the cake had not yet been formed.

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Measurement of the electrostatic charge in airborne particles: II - particle charge distribution of different aerosols

Cited by 18 publications

References 4 publications

Multi-fidelity uncertainty quantification of particle deposition in turbulent pipe flow

Multi-fidelity uncertainty quantification of particle deposition in turbulent pipe flow

An electrostatic measuring technique for monitoring particle size in dilute pneumatic transport

Filtration of Electrified Solid Particles in a Fibrous Filter

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