Electrical image deposition of charges from laminar flow in cylinders

Becker, R. S.; Anderson, V. E.; Allen, Josef D.; Birkhoff, R.D.; Ferrell, T. L.

doi:10.1016/0021-8502(80)90118-4

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…The effect of image forces on non-diffusive particle deposition has been addressed by Yu (1977), Yu and Chandra (1978), Becker, Anderson, Allen, Birkhoff, and Ferrell (1980), and Ljepojevic and Balachandran (1993). According to Yu and Chandra (1978), the effect of image force on particle deposition is negligible for particles carrying less than 10 elementary charges.…”

Section: Introductionmentioning

confidence: 99%

Penetration of aerosol undergoing combined electrostatic dispersion and diffusion in a cylindrical tube

Alonso¹

2007

Journal of Aerosol Science

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Section: Introductionmentioning

confidence: 99%

Penetration of aerosol undergoing combined electrostatic dispersion and diffusion in a cylindrical tube

Alonso¹

2007

Journal of Aerosol Science

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“…For low space-charge densities the dominant transport mechanism is the electric field that occurs from the image charge caused by the interaction of a particle and a grounded wall. This case has been studied by [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Deposition of charged nano-particles in the human airways including effects from cartilaginous rings

Åkerstedt

2011

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This paper presents a numerical study of the deposition of spherical charged nano-particles caused by convection, Brownian diffusion and electrostatics in a pipe with a cartilaginous ring structure. The model describes the deposition of charged particles in the different generations of the tracheobronchial tree of the human lung. The upper airways are characterized by a certain wall structure called cartilaginous rings which modify the particle deposition when compared to an airway with a smooth wall. The problem is defined by solving Naver-Stokes equations in combination with a convective-diffusion equation and Gauss law for electrostatics. Three nondimensional parameters describe the problem, the Peclet number 2 Pe Ua D  , the Reynolds number 2 Re Ua   and an electrostatic parameter 1 2 . 3 4 1 . 0 5e x p 0 . 3 9 Cu d d       Here d is the particle diameter and  the mean free path of the air molecules. Results are provided for generations G4-G16 of the human airways. The electrostatic parameter is varied to model different concentrations and charge numbers.

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“…The increased prevalence of CWP observed with coal rank may be partly related to the increased dust cloud charging in higher ranked coals as measured by Organiscak and Page (1998). This increased deposition may also be attributed to the higher lung deposition ef ciency of agglomerated ultra ne submicron particles as well as to image charging effects within the lung (Yu and Chandra 1978;Becker et al 1980). Kaya and Hogg (1992) state that one would not intuitively expect signi cant agglomeration of airborne dust in the mine atmosphere at the levels of dust concentrations found even in the most dusty mines.…”

Section: Introductionmentioning

confidence: 99%

Using Proximate Analysis to Characterize Airborne Dust Generation from Bituminous Coals

Page¹,

Organiscak²

2002

Aerosol Science and Technology

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The amount of airborne respirable dust generated from breakage of different coals varies widely. This research was conducted to identify the facets of airborne respirable dust liberation from the coal product. Laboratory crushing experiments were conducted on a range of low to high volatile bituminous coals to investigate the various factors in uencing airborne respirable dust generation. Bituminous coal samples from 8 mines (5 U.S. and 3 Polish) were uniformly prepared and processed through a double roll crusher located in a low air velocity wind tunnel. Experimental factors studied included inherent coal seam constituents, speci c energy of crushing, product size characteristics, dust cloud electrostatic eld, and speci c quantity of airborne respirable dust generated.The results of this investigation build upon previously published results, which indicated that a combination of several factors are associated with the generation of airborne respirable dust. One factor involved is the effect of coal rank, described by the inherent moist fuel ratio, on the product size characteristics, de ned by Schuhmann size function parameters. However, since coals of high moist fuel ratio (high rank) are generally more extensively cleated, it is suggested in the present work that the degree of cleating is directly responsible for the quantity of respirable-sized particles produced in the crushed product material for eastern U.S. coals. This is implied by the relationship of ash content and at least one mineral constituent (pyrite, determined from pyritic sulfur analysis) to the percentage of airborne respirable dust. To validate this hypothesis, a description is offered that is based on known coal petrography.Another key factor is the effect of air dry loss moisture in the coal seam on the breakage-induced electrostatic eld of airborne dust. The air dry loss moisture factor appears to control the amount of airborne respirable dust that is liberated from the product. The resultant effect of these factors is that different percentages of coal particles smaller than 10 ¹m are dispersed as airborne respirable dust, with a well-de ned peak in the normalized airborne respirable dust for a narrow range of air dry loss moisture ¥ ash ratios. A clear delineation of coals, based on well-known proximate analysis characteristics, that generate the most respirable dust appears to be possible. It was also shown that the dust-generating characteristics of coals could be reasonably described by both the moist fuel ratio

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Electrical image deposition of charges from laminar flow in cylinders

Cited by 5 publications

References 4 publications

Penetration of aerosol undergoing combined electrostatic dispersion and diffusion in a cylindrical tube

Penetration of aerosol undergoing combined electrostatic dispersion and diffusion in a cylindrical tube

Deposition of charged nano-particles in the human airways including effects from cartilaginous rings

Using Proximate Analysis to Characterize Airborne Dust Generation from Bituminous Coals

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