Droplet Charging for Wet Scrubbers

Pilat, Michael J.; Lukas, John C.

doi:10.1080/10473289.2004.10470887

Cited by 6 publications

(4 citation statements)

References 8 publications

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“…Charged droplets can be produced by different processes with variable charge-to-mass ratio (Bailey, 1988;Vaaraslahti et al, 2002;Pilat et al, 2004;Krupa et al, 2013). Charged droplets may be produced without liquid polarization, by charge separation during breakup of the liquid double layer.…”

Section: Methods For the Production Of Charged Water Droplets For Bipmentioning

confidence: 99%

“…Water droplets can also be charged by Corona ions (Xu DX et al, 2003) to lower levels than by the simplest induction charging by liquid polarization in mechanical nebulizers, achieving up to 10 % of the Rayleigh charge limit (Bailey, 1988). Charge-to-mass ratio from 10 -3 to 1 mC.kg -1 have been measured for 50 µm water droplets from pressure nebulizers where the liquid is pressurized across an orifice (Pilat et al, 2004;Krupa et al, 2013) and from pneumatic nebulizers (Metzler et al, 1997;Yang HT et al, 2003). ES is used to achieve tunable and higher charge per drop -by induction charging as well-, but without dilution of the aerosol to be filtered by additional gas flow for the production of charged droplets (Lear et al, 1975;Hara et al, 1984).…”

Section: Methods For the Production Of Charged Water Droplets For Bipmentioning

confidence: 99%

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Review on water electro-sprays and applications of charged drops with focus on the corona-assisted cone-jet mode for High Efficiency Air Filtration by wet electro-scrubbing of aerosols

Borra

2018

Journal of Aerosol Science

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 electrosprays is a continuous production process of self-dispersed unipolar droplets with monodisperse/unimodal size distributions (0.2 < d modal < 150 µm)  Applications of ES of aqueous solutions are reviewed with special attention for material production and bio-applications  Means to achieve steady water ES are presented with respect to electrical discharges in ambient air around the liquid cone and jet  Streamer discharges with transient and asymmetric space charges disrupt the EHD equilibrium for steady cone-jet mode, while the axisymmetric and quasi-stationary space charge is required to achieve steady water ES in the pulseless corona-assisted cone-jet mode  Empirical scaling laws of droplet properties are reminded for both steady water ES in cone-jet with a pulseless corona and without discharge  High filtration efficiencies of a lab-scale wet bipolar-scrubbers (>99%) supports that Water ES in corona-assisted cone-jet could be applied to low cost Air cleaning

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Section: Methods For the Production Of Charged Water Droplets For Bipmentioning

confidence: 99%

Section: Methods For the Production Of Charged Water Droplets For Bipmentioning

confidence: 99%

Review on water electro-sprays and applications of charged drops with focus on the corona-assisted cone-jet mode for High Efficiency Air Filtration by wet electro-scrubbing of aerosols

Borra

2018

Journal of Aerosol Science

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“…Another common technique, electrohydrodynamic atomization and tip streaming, relies on the application of a high electric field for fluid dispersion. [10][11][12][13][14] Still, there is a wide range of techniques for production of discretely charged droplets for applications including mass spectrometry, [15][16][17][18][19][20][21] drop-on-demand manufacturing of multilayer parts and circuits, 22,23 spray coatings, 24,25 biosensing and other lab-on-a-chip applications, [26][27][28][29] and wet scrubber systems for pollution control, 30 among others. The focus of this work is on mechanically driven atomization, which is coupled to an external electric field for droplet charging.…”

Section: Introductionmentioning

confidence: 99%

Droplet charging regimes for ultrasonic atomization of a liquid electrolyte in an external electric field

2011

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Distinct regimes of droplet charging, determined by the dominant charge transport process, are identified for an ultrasonic droplet ejector using electrohydrodynamic computational simulations, a fundamental scale analysis, and experimental measurements. The regimes of droplet charging are determined by the relative magnitudes of the dimensionless Strouhal and electric Reynolds numbers, which are a function of the process ͑pressure forcing͒, advection, and charge relaxation time scales for charge transport. Optimal ͑net maximum͒ droplet charging has been identified to exist for conditions in which the electric Reynolds number is of the order of the inverse Strouhal number, i.e., the charge relaxation time is on the order of the pressure forcing ͑droplet formation͒ time scale. The conditions necessary for optimal droplet charging have been identified as a function of the dimensionless Debye number ͑i.e., liquid conductivity͒, external electric field ͑magnitude and duration͒, and atomization drive signal ͑frequency and amplitude͒. The specific regime of droplet charging also determines the functional relationship between droplet charge and charging electric field strength. The commonly expected linear relationship between droplet charge and external electric field strength is only found when either the inverse of the Strouhal number is less than the electric Reynolds number, i.e., the charge relaxation is slower than both the advection and external pressure forcing, or in the electrostatic limit, i.e., when charge relaxation is much faster than all other processes. The analysis provides a basic understanding of the dominant physics of droplet charging with implications to many important applications, such as electrospray mass spectrometry, ink jet printing, and drop-on-demand manufacturing.

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“…Dry solution generally uses electric dust collection machines while wet one uses water spraying in most cases [2, 3,4].…”

Section: Introductionmentioning

confidence: 99%

Innovative Micro-Dust Reduction Technologies

Cho

2017

Acta chem. Malay.

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Background: An optimum design of road facilities, such as cantilever columns for traffic lights, walkway block for the purpose of rainwater harvesting with the development of an integration of pole with foundation of street lights on highways is proposed for solving current significant challenges of air pollution. In this study, we suggested solutions for given problems by determination for the location of minimum principal stress in walkway blocks against moving foot loads to design and verifying the determined location of minimum principal stress. Method: An optimum design with a verification example for determined location of minimum principal stress have been presented in a two-dimensional Block member on elastic foundation for pedestrian walkway for reserving water inside. Results: The minimum value for sum of shear forces is found when x1 is 58.58 mm (30% of total span, 200mm), while the minimum deformation is located at x2= 80 mm (70% of total span, 200mm). In a modified model, when moving boundary condition (walkway foot loads) is located at x1(=0 mm), the location of minimum principal stresses is found at 168 mm (84% of span, 200mm), in which the stress concentration due to the foot load is modelled as two layers of distributed loads (reactions of foundation modelled as springs). Conclusion: Consequently, zero deformed reservoirs for rainwater on the neutral axis (x2=167mm) has been determined in the modified model with three-dimensional FEM analysis verifications.

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Droplet Charging for Wet Scrubbers

Cited by 6 publications

References 8 publications

Review on water electro-sprays and applications of charged drops with focus on the corona-assisted cone-jet mode for High Efficiency Air Filtration by wet electro-scrubbing of aerosols

Review on water electro-sprays and applications of charged drops with focus on the corona-assisted cone-jet mode for High Efficiency Air Filtration by wet electro-scrubbing of aerosols

Droplet charging regimes for ultrasonic atomization of a liquid electrolyte in an external electric field

Innovative Micro-Dust Reduction Technologies

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