Grade efficiency and Eddy diffusivity models

Riehle, Claus; Löfer, F.

doi:10.1016/0304-3886(94)00024-q

Cited by 18 publications

(11 citation statements)

References 15 publications

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“…This is consistent with previous studies (Riehle and Löffler 1995;Park and Chun 2002;Saiyasitpanich et al 2006;Li et al 2010). However, a better accuracy was expected since the electric field and the space charge density variation were investigated and computed with Townsend's analytical model.…”

Section: Discussionsupporting

confidence: 94%

Investigation of a New Electrostatic Sampler for Concentrating Biological and Non-Biological Aerosol Particles

Roux

Kaspari

Heinrich

et al. 2013

Aerosol Science and Technology

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The detection of airborne pathogens is becoming a subject of great concern in modern day society. Recent studies have shown that electrostatic samplers are suitable for collecting microorganisms as well as preserving their viability. In most of these studies, flow rates were lower than 12.5 L/min or required a concentration stage to increase the flow rate to 100 L/min. In the present study, a single stage electrostatic sampler was developed for an efficient collection of microorganisms at 100 L/min. The design is based on the positive DC corona between coaxial cylinders to continuously create charged particles as they pass through the sampler. The physical collection efficiency of the device was investigated by sampling the ambient air particles. The efficiency in collecting live biological samples was determined by sampling live bacterial spores with the collector situated inside an aerosol chamber. It is shown that particles of 0.3-0.35 µm are captured with an efficiency of about 86%, whereas cultivable spores of Bacillus thuringiensis are collected with an efficiency of about 94%. Results are compared with an analytical predictive model. The experimental results are similar to the efficiencies previously reported in the literature; however, the current sampler design features a higher flow rate which enables the device to be used as an alarm trigger in a shorter period of time.

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Section: Discussionsupporting

confidence: 94%

Investigation of a New Electrostatic Sampler for Concentrating Biological and Non-Biological Aerosol Particles

Roux

Kaspari

Heinrich

et al. 2013

Aerosol Science and Technology

View full text Add to dashboard Cite

show abstract

“…Therefore, it is usual to divide the instantaneous values into a timeaveraged value and a fluctuating component [12,14,21]. The latter technique is analogous to that used in molecular transport theory in which a common method to model the turbulent flux is to use the concentration gradient and the turbulent dispersion coefficient ៝ D. Then Eq.…”

Section: Convective Diffusion Equationmentioning

confidence: 99%

“…(8) represents the effect of the electric field gradient on the particle concentration, which was ignored in some theoretical models to simplify the calculation [13,14,21].…”

Section: Convective Diffusion Equationmentioning

confidence: 99%

“…In this study, we employ a simplifying assumption of a uniform turbulent dispersion coefficient, which has been proved to be reasonable for some cases and has been adopted in some studies [13,18,21]. Hence, the longitudinal coefficient (D x ) is equal to the transverse coefficient (D y ), and the related physical quantities are specified below [28,29] 1…”

Section: Turbulent Dispersion Coefficientmentioning

confidence: 99%

“…The particle transport within ESPs is modeled by the convective diffusion equation, which includes the uniform turbulent dispersion coefficient, the inhomogeneous electric field and particularly the electric field gradient which was ignored in many previous models [13,14,21].…”

Section: Introductionmentioning

confidence: 99%

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