On the friction coefficient of straight-chain aggregates

Isella, Lorenzo; Drossinos, Yannis

doi:10.1016/j.jcis.2011.01.072

Cited by 17 publications

(22 citation statements)

References 24 publications

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“…The proportionality constant may be eliminated by taking appropriate collision rate ratios. Therefore, according to the computational procedure proposed by Isella and Drossinos (2011), the friction coefficient of straight chains may be obtained via the calculation of effective collision rates of diffusing fictitious particles. The fictitious particles behave as Brownian particle in a background gas.…”

Section: Collision Rate Methods (Crm)mentioning

confidence: 99%

“…3) (Isella and Drossinos 2011) and then applied to fractal-like aggregates to determine their continuum-regime mobility radius (Melas et al 2014a). The validity of the CRM was extended to the slip-flow and transition regimes in Melas et al (2014b).…”

Section: Collision Rate Methods (Crm)mentioning

confidence: 99%

“…In the continuum regime, the dynamic shape factor is χ N (0) = R eq /R m (0) (Isella and Drossinos 2011). In the transition regime…”

Section: Hydrodynamic Radius and Dynamic Shape Factormentioning

confidence: 99%

“…This characterization of aggregate mobility may be viewed as a direct investigation of how morphology determines mobility, to be contrasted to the inverse problem dealt with in experimental studies, whereby information on morphology is extracted from mobility measurements. Isella and Drossinos (2011) argued that the solution of the Laplace equation may be used to calculate approximately ratios of friction coefficients of straight chains in the continuum regime. Their heuristic argument was motivated by experimental measurements of mass transfer coefficients to nanoparticles of a variety of species, shapes, and sizes (for a review; Keller et al 2001).…”

Section: Introductionmentioning

confidence: 99%

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Friction Coefficient and Mobility Radius of Fractal-Like Aggregates in the Transition Regime

Melas

Isella

Konstandopoulos

et al. 2014

Aerosol Science and Technology

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The influence of geometric properties and particle size on mobility properties of fractal-like aggregates was studied in the mass and momentum-transfer transition regimes. Two methodologies were investigated. The Collision Rate Method (CRM) that determines the slip correction factor through the ratio of two fictitious Brownian particle-aggregate effective collision rates, and the Adjusted Sphere Method (ASM) that assumes the existence of a virtual, flowindependent adjusted sphere with the same slip correction factor as the aggregate over the entire transition regime. The simulated fractal-like aggregates were synthetic as they were generated via a cluster-cluster agglomeration algorithm. The CRM was used to calculate the adjusted-sphere radius of various aggregates: we found it to be weakly dependent on the monomer Knudsen number for Kn greater than 0.5. Numerical expressions for the aggregate orientationally-averaged projected area and the adjusted-sphere radius are proposed. Both expressions depend on geometric, nonensemble averaged quantities: the radius of gyration and the number of monomers. The slip correction factor and the mobility radius of DLCA and RLCA aggregates were calculated using the ASM: for a given number of monomers, fractal dimension and prefactor, and Knudsen number their values were approximately constant (averaged over aggregate realizations). A fractal-like scaling law based on the mobility radius was found to hold. The mobility fractal dimension and prefactor were determined for different aggregates. The hydrodynamic radius, proportional to the friction coefficient, © 2014 European Union Received 4 July 2014; accepted 8 October 2014. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons. org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium provide the original work is properly cited. The moral rights of the named author(s) have been asserted.Address correspondence to Yannis Drossinos, European Commission, Joint Research Centre, Ispra, VA I-21027, Italy. E-mail: ioannis. drossinos@jrc.ec.europa.eu Color versions of one or more of the figures in the article can be found online at www.tandfonline.com/uast. and the dynamic shape factor of DLCA and RLCA aggregates were also calculated.

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Section: Collision Rate Methods (Crm)mentioning

confidence: 99%

Section: Collision Rate Methods (Crm)mentioning

confidence: 99%

“…In the continuum regime, the dynamic shape factor is χ N (0) = R eq /R m (0) (Isella and Drossinos 2011). In the transition regime…”

Section: Hydrodynamic Radius and Dynamic Shape Factormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Friction Coefficient and Mobility Radius of Fractal-Like Aggregates in the Transition Regime

Melas

Isella

Konstandopoulos

et al. 2014

Aerosol Science and Technology

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“…It becomes [17] used to define the cluster effective density, the density of a fictitious spherical particle of radius the hydrodynamic radius and of the same mass as the initial irregularly shaped aggregate. It is defined by…”

Section: Mobility Scaling Law and Dynamic Shape Factormentioning

confidence: 99%

Morphology and mobility of synthetic colloidal aggregates

Melas¹,

Isella²,

Konstandopoulos³

et al. 2014

Journal of Colloid and Interface Science

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The relationship between geometric and dynamic properties of fractallike aggregates is studied in the continuum mass and momentum-transfer regimes. The synthetic aggregates were generated by a cluster-cluster aggregation algorithm. The analysis of their morphological features suggests that the fractal dimension is a descriptor of a cluster's large-scale structure, whereas the fractal prefactor is a local-structure indicator. For a constant fractal dimension, the prefactor becomes also an indicator of a cluster's shape

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Aerosol Dynamics

Lazaridis

Drossinos

2013

Aerosol Science

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On the friction coefficient of straight-chain aggregates

Cited by 17 publications

References 24 publications

Friction Coefficient and Mobility Radius of Fractal-Like Aggregates in the Transition Regime

Friction Coefficient and Mobility Radius of Fractal-Like Aggregates in the Transition Regime

Morphology and mobility of synthetic colloidal aggregates

Aerosol Dynamics

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