Kinetic Programmed Resuspension - KPR technique

Benito, Jesica Gisele; Uñac, Rodolfo Omar; Vidales, Ana María; Ippolito, I.

doi:10.1016/j.jaerosci.2018.05.006

Cited by 5 publications

(3 citation statements)

References 35 publications

(79 reference statements)

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“…Another approach of those models is to consider a kinetic probability density function (PDF) of some parameters influencing the phenomenon. The models proposed by Reeks & Hall (2001), and recently by Benito et al (2015Benito et al ( , 2016Benito et al ( , 2018 are some examples of kinetic PDF models. The last type of resuspension models is the dynamic PDF approach which considers the motion of particles along the surface before being released like the models developed by Guingo & Minier (2008) and Henry & Minier (2014 b).…”

Section: Introductionmentioning

confidence: 99%

Local experimental methodology for the study of microparticles resuspension in ventilated duct during fan acceleration

Theron

Debba

Coq

2020

Journal of Aerosol Science

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The purpose of this study is to develop an experimental methodology with relevant space and time resolutions to track the velocity properties responsible for the resuspension of microparticles during the acceleration stage of a fan start. Microparticles release is investigated over a time period of several seconds, i.e. at short time. This methodology involves velocity signal measurements thanks to Hot Wire Anemometry, and an optical counting method to build resuspension kinetics curves. During the fan acceleration the velocity evolution is characterized by two stages: a first increase without fluctuations, and then the acceleration with fluctuations. The same behavior is observed whatever the distance to the wall at which velocity is considered. The resuspension phenomenon seems to be initiated by a threshold turbulent kinetic energy, i.e. by turbulent events powerful enough to release microparticles having the lowest adhesion forces. For the studied particles properties/wall properties/aeraulic conditions, a significant fraction of particles remains on the duct wall at the end of experiments, despite the fact that the remaining fraction is stabilized. This may reveal that the highest energy levels of flow events seen by microparticles were not powerful enough to release particles having the highest adhesion forces.

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Section: Introductionmentioning

confidence: 99%

Local experimental methodology for the study of microparticles resuspension in ventilated duct during fan acceleration

Theron

Debba

Coq

2020

Journal of Aerosol Science

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“…The concept of resuspension as an activated problem where the role of temperature is played here by the turbulent air flow, provides a vision from the physical foundations of statistical mechanics, which complements and enriches the understanding of particle resuspension. It also enables to develop new techniques as the so called KPR (Kinetic programed Resuspension) that, like its thermodynamic counterpart Temperature Programmed Desorption (TPD), could be used to get important information about the characteristics of the surface where resuspension is taking place [67].…”

Section: Final Remarksmentioning

confidence: 99%

Resuspension processes in a wide range of particle sizes

et al. 2021

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Particulate matter offers a broad spectrum of phenomena, well known in the granular matter community. This fact is not only related to the individual or collective behaviour that grains can present depending on the external boundary conditions and/or internal interactions but, to the wide range of particle sizes. This feature confers the possibility of studying a particular phenomenon in different size scales. The main goal of this paper is to describe the detachment of particles from surfaces, where particles go from tens of microns to several millimetres, in a variety of scenarios. All the studied systems presented here have in common the need to determine the critical conditions to lose the equilibrium balance, initiating incipient motion. Solving the right time moment for particle resuspension, consideration of the local interactions between particle, surface and external applied forces can be achieved from different modelling approaches, from deterministic dynamics to statistical mechanics. This paper focuses on some of these approaches performed recently on grains through different size scales.

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“…The formalism of these models is adapted to the main resuspension mechanism (which is generally assumed) among rolling, sliding or direct lifting. Some of these static models, like those of Reeks and Hall (2001) and Benito et al (2018) take into consideration probability density functions (PDF) to represent the distribution of some parameters influencing the resuspension phenomenon. Dynamic models, like that of Guingo and Minier (2008) are based on the type of particle motion on the wall surface before detachment.…”

Section: Introductionmentioning

confidence: 99%

Influence of the transient airflow pattern on the temporal evolution of microparticle resuspension: Application to ventilated duct during fan acceleration

Theron

Debba

Coq

2022

Aerosol Science and Technology

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This study investigates experimentally the influence of the temporal airflow pattern properties to which microparticles are exposed on the dynamics of the resuspension phenomenon for transient airflow conditions representative of a fan start, i.e., involving a temporal acceleration period before reaching steady state. The extent to which the average steady state velocity and the average acceleration affect the characteristics of the curve depicting the temporal evolution of the fraction of particles remaining on the duct wall, i.e., the time at which resuspension starts and the curve shape, is investigated. These results are analyzed regarding the properties of the instantaneous velocity signal in the viscous sublayer. It is demonstrated that a threshold turbulent kinetic energy must be exceeded for resuspension to begin. The results are also presented in terms of resuspension rate, i.e., of instantaneous rate of particles removed from the duct surface, versus time. This enables to demonstrate that the highest resuspension rate values are recorded at the very beginning of the phenomenon, typically during the fan acceleration stage, and that high mean acceleration values are responsible for high resuspension rates.

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Kinetic Programmed Resuspension - KPR technique

Cited by 5 publications

References 35 publications

Local experimental methodology for the study of microparticles resuspension in ventilated duct during fan acceleration

Local experimental methodology for the study of microparticles resuspension in ventilated duct during fan acceleration

Resuspension processes in a wide range of particle sizes

Influence of the transient airflow pattern on the temporal evolution of microparticle resuspension: Application to ventilated duct during fan acceleration

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